2 Nervus Vestibuli
2. Nervus Vestibuli. The Vestibular Division Of The Auditory Nerve Arises Within The Ganglion Vestibulare Or Scarpa's Ganglion, Located At The Bottom Of The Internal Auditory Canal. The Periph Erally Directed Processes Or Fibres Of These Ganglion Cells Run To The Ampullae, The Utricle And Saccule Of The Internal Ear; ...
Ar Achnoidea
Ar Achnoidea. This Delicate Transparent Membrane Consists Of Connective Tissue And Is Devoid Of Blood-vessels. It Is Separated From The Dura By The Subdural Space And Connected With The Pia By Strands Of Connective Tissue. These Strands Form The Subarachnoidal Tissue, And The Cleft Between The Arachnoid And The Pia ...
Association Tracts
Association Tracts. When Discussing Cerebral Localization, It Was Pointed Out, That The Various Divisions Of The Brain Were Divided In A General Way, According To Their Function, Into Higher And Lower Parts. Functionally The Highest Division Is The Cerebrum, With The Cerebral Cortex; The Lower Divisions Intervene Between The Spinal ...
B Reflex Tracts
B. Reflex Tracts. The Simplest Reflex Path Is Established By The Reflex Collaterals. In This Case Only Two Neurones Share The Entire Path, The Transference From The Centripetal To The Centrifugal Neurone Being Accomplished By Means Of The Collaterals Given Off Directly From The Centripetal Or Afferent Neurone. The Release ...
Bulbus Olfactorius
Bulbus Olfactorius. The Bulbus Olfactorius Exhibits The Following Layers : 1. The Layer Of The Superficial Nerve-fibres. This, The Fibre-layer, Is Formed By The Nerve-fibres Coming From The Olfactory Epithelium (fig. I16). Within The Epithelium Of The Olfactory Mucous Membrane, The Bipolar Nerve-cells Lie Among The Sus Tentacular Cells. They ...
Central Tract A
Central Tract. A. Connection Of The Bulbus Olfactorius With The Primary Centres. Within The Glomeruli, The Impulse Is Transferred To The Olfactory Brush Of The Mitral And Brush Cells ; It Then Reaches The Mitral Or Brush Cells And Thence, By Means Of Their Axones, Is Conducted Centrally To The ...
Centrifugal Tracts
Centrifugal Tracts. T. The Efferent Cortico-muscular Or Motor Tract Takes Its Origin In The Motor Region Of The Cerebral Cortex. • Neurone I: Through The Internal Capsule (knee And Anterior Two-thirds Of The Poste Rior Limb), The Basis Or Crusta Of The Cerebral Peduncle (middle Three-fifths), The Pons And The ...
Centripetal Tracts
Centripetal Tracts. X. Ascending Sensory Tracts From The Spinal Cord. A. The Path For The Conduction Of Impulses Of Touch, Temperature And Pain From The Trunk And The Extremities. Neurone I: The Impulse Is Conveyed From The Periphery To The Ganglion-cells Within The Spinal Ganglion And Thence To The Spinal ...
Cerebral Localization
Cerebral Localization. The Various Subdivisions Of The Brain Are Broadly Divided, With Regard To Their Functions, Into Two Chief Groups, The Higher And The Lower. The Higher Subdivisions Are The Cerebral Hemispheres, And In These The Cerebral Cortex, Which Through The Great Development Of The Cerebral Mantle And The Formation ...
Conduction Paths Of The
Conduction Paths Of The Diencephalon. The Connections Which Unite The Diencephalon With Other Parts Of The Brain Have, In Large Part, Been Presented In The Preceding Section. To These Belong, In The First Place, The Tractus And Thalamic Peduncles—of Which The Tegmental Tract And The Optic Radiation May Be Again ...
Conduction Paths Of The_2
Conduction Paths Of The Mesencephalon. The Mesencephalon, Which, As The Smallest Of The Brain Segments, Includes The Quadrigeminal Region And The Cerebral Peduncles, Is Traversed By Several Main Tracts, On The One Hand, And Is The Termination Or The Origin Of Many Fibre-strands, On The Other. I. The Chief Tracts ...
Conduction Paths Of The_3
Conduction Paths Of The Metencephalon. Before Considering The Individual Fibre-tracts Connecting The Cerebellum And The Pons With Other Parts Of The Brain And The Spinal Cord, The Structure Of The Cerebellar Cortex Must Be More Closely Examined. The Cerebellar Cortex Presents The Following Layers : I. The Molecular Outermost Stratum ...
Cortex Of The Pallium
Cortex Of The Pallium. Based On The Arrangement Of The Nerve-cells, The Following Six Strata Or Layers Are Distinguished. I. The Molecular Layer. This Constitutes The Most Superficial Stratum And Is A Dense Feltwork, Composed Principally Of Fibres Running Mostly Parallel To The Surface ; Hence, It Is Also Designated ...
Development Of The Brain
Development Of The Brain. The Fundamental Form Is The Simple Brain-tube. In Consequence Of Increased Growth In Certain Parts And Diminished Growth In Others, The Brain-tube Early Exhibits A Segmentation. At First It Consists Of Three Dilatations, The Primary Separated By Two Annu Lar Constrictions, The Vesicles Being Desig Nated ...
Development Of The Ependyma
Development Of The Ependyma And The Neuroglia Cells. The Ependyma Cells Maintain In The Foetal Stage The Character Of An Epithelium And The Relations To The Membrana Limitans Externa And Interna. In The Brain, As In The Spinal Cord, The Ependyma Cells Extend From The Inner To The Outer Surface ...
Development Of The Nerve Cells
Development Of The Nerve-cells. The Neuroblasts, From Which The Nerve-cells Arise, Are Developed In The Innermost Layer Of The Medullary Tube, Bordering The Central Canal. Thence They Migrate Outward Through The Inner Layer And Localize Within A Dorso-ventrally Expanding Region, That Is Bounded Medially By The Inner Layer And Laterally ...
Development Of The Spinal
Development Of The Spinal Cord. The Part Of The Neural Tube That Becomes The Spinal Cord Appears Of Oval Form On Transverse Section. The Central Canal Forms A Dorso-ventrally Directed Cleft, Which Is Bounded Laterally By The Thickened Walls Of The Medullary Tube, But Dorsally And Ven Trally By Thinner ...
Diencephalon
Diencephalon. To The Diencephalon, Sometimes Called The On Account Of Its Position Between The End- And The Mid-brain, Belong : The Thalamencephalon And The Pars Mamillaris Hypothalami. The Diencephalon Surrounds The Third Ventricle. The Immediate Roof Of The Latter Is Formed By The Lamina Chorioidea E,t5ithelialis And The Ida Chorioidea ...
Dura Mater
Dura Mater. The Dura Mater Consists Of Two Lamellae. The Outer Lamella, Which Lies Against The Bone And Serves As The Inner Periosteum Of The Cranial Case, Consists Of Soft, Loose Vascular Connective Tissue. The Inner Lamella Is Denser, Made Up Of Fibrous Connective Tissue, And Contains Few Blood-vessels. While ...
External Configuration
External Configuration. The Anterior Or Ventral Surface Of The Spinal Cord Is Cleft In The Mid-line By A Deep Longitudinal Furrow, The Fissura Mediana Anterior; The Posterior Or Dorsal Surface Is Modelled By A Superficial Dinal Groove, The Sulcus Medianus Posterior. By Means Of These Two Rows The Spinal Cord ...
Fibre Tracts Of The Cerebellum
Fibre-tracts Of The Cerebellum. All Cortical Regions Of The Cerebellum Are Linked Together By Means Of Arched Fibres, The Fibrae Arciformes. Such Association Systems Unite Neighboring Folia Or Lobules Of The Cerebellum. The Cortex, Moreover, Sends Centrifugal Fibres To The Nuclei—to The Nucleus Dentatus And The Nucleus Fastigii, As Well ...
General Division Of The
General Division Of The Conduction Paths. The Entire Nervous System Is Built Up Of Nervous Units Or Neurones. With Regard To Their Physiological Tasks, The Neurones May Be Divided Into Two Chief Groups, Those Which Conduct Impulses Centrifugally And Those Which Conduct Centripetally. • The Centrifugal Paths Serve To Convey ...
General Inspection Of The
General Inspection Of The Brain. Let Us First Examine The Dorsal Surface Of The Brain. This Is Strongly Arched In The Sagittal As Well As In The Frontal Direction—fades Convexa Cerebri (fig. 14). A Deep Median Vertical Cleft (fissura Longitudinalis Cerebri) Divides The Whole Into Two Symmetrical Halves, The Hemispheres ...
Gray Masses And Nuclei
Gray Masses And Nuclei. In Addition To The Gray Cortex, The Substantia Corticalis, Other Definite Gray Masses, Known As The Nuclei Or Ganglia Of The End-brain, Are Found Within The Interior Of The Hemispheres. They Are The Nucleus Caudatus, The Nucleus Lentiformis, The Claustrum And The Nucleus Amygdalae, And Are ...
Gyri Andreae Retzii
Gyri Andreae Retzii. These, Also Known As The Callosal Convolutions, Represent Rudimentary Gyri, Which Appear As Round Or Oval Elevations On The Medial Surface Of The Gyrus- Hippocampi, Beneath The Splenium And In The Angle Formed By The Dentate And Hippocampal Gyri. They Are Not Constant And May Be Little ...
Gyrus Dentatus
Gyrus Dentatus. When, In Order To Determine The Depth Of The Hippocampal Fissure, The Gyrus Hippocampi Is Pulled Downward, One Sees A Gray Notched Or Corrugated Band, The Fascia Dentata (tarini) Or The Gyrus Demeans Of Huxley. Farther Inward And Over The Gyrus Dentatus, Is Seen A White Band, Which ...
Gyrus Dentatus_2
Gyrus Dentatus. The Gyrus Dentatus Constitutes A Small Modified Cerebral Cortex, Which Adjoins The Lamina Medullaris Circumvoluta Of The Hippocampus And Receives Within Its Hilus The End Of The Hippocampus. The White Substance Of The Gyrus Dentatus Is Net Directly Applied To The Layer Of Polymorphic Cells, But Is Separated ...
Gyrus Fornicatus
Gyrus Fornicatus. To The Peripheral Region Of The Rhinencephalon, The Lobus Olfactorius, Is Attached The Central District. Here The Gyrus Fornicatus First Claims Closer Attention. It Is An Annular Tract On The Medial Surface Of The Hemisphere, Encircled By The Cerebral Mantle And Composed Of Two Chief Convolutions, The Gyms ...
Hippocampus And Gyrus Dentatus
Hippocampus And Gyrus Dentatus. The Hippocampus, Or Cornu Ammonis, And The Gyrus Dentatus Represent Two Spe Cial Convolutions. On Following The Gyms Hippocampi Dorsally, One Reaches The Subin Culum, That Constitutes That Part Of The Hippocampal Convolution In Which Gradually Begins A Change In The Structure Of The Cerebral Cortex, ...
Histogenesis Of The Nervous
Histogenesis Of The Nervous System. The Elements Of The Nervous System Are Developed From The Outer Germ-layer Or The Ectoderm. As We Have Already Seen, The Brain And The Spinal Cord Arise From A Broad Medial Strip Of Ectoderm. Here The Medullary Plate Is Formed, Which Is Bounded Nally By ...
Internal Configuration
Internal Configuration. Even With The Unaided Eye, One Can Readily Distinguish Gray And White Substance In A Transverse Section Of The Spinal Cord. When Cut Across, The Centrally Situated Gray Substance Appears H-form In Outline. The Bridge Of Gray Substance Connecting The Two Limbs Of The H, Encloses The Central ...
Internal Configuration Of The
Internal Configuration Of The Telencephalon. The Examination Of The Inner Configuration Of The End-brain Is Carried Out Most Advantageously In The Following Manner. A Brain Is Laid On Its Base And The Removal Of The Hemispheres Is Begun. This Is Ac Complished By Passing Horizontally, With Slow Continuous Stroke, A ...
Isthmus Rhombencephali
Isthmus Rhombencephali. The Isthmus Rhombencephali Forms The Transition From The Mid-brain To Rhomb Encephalon, Which Latter Is Subdivided Into The Metencephalon And The Myelen Cephalon. To The Isthmus Belong The Brachia Conjunctiva, The Velum Medullare Anterius And The Trigonum Lemnisci, Which Structures Collectively Constitute The Dorsal Part Of The Isthmus. ...
Lobes And Gyri Of
Lobes And Gyri Of The Medial And Basal Surfaces. All Four Cerebral Lobes, With Which We Have Now Become Somewhat Intimately Acquainted On The Dorso-lateral Aspect Of The Hemisphere, Are Continued Onto The Medial And Partly Also Onto The Basal Surface. They Do Not Extend, However, Over The Entire Medial ...
Lobes And Gyri Of
Lobes And Gyri Of The Dorso-lateral Surface. Turning Again To The Basal Aspect Of The Hemisphere, The Vallecula Sylvii (fossa Cerebri Lateralis) Appears As A Deep Cleft, Lateral To The Substantia Perforata Anterior, That Separates The Basis Cerebri Into An Anterior And Posterior Division. From The Valley The Fissura Cerebri ...
Lobus Olfactorius Anterior
Lobus Olfactorius Anterior. The Bulbus Olfactorius Presents Usually An Oval Form—an Ellipse Or A Vertically Flattened Band—and Constitutes An Enlargement Of The Tractus Olfactorius In Front. On The Under Surface, Delicate Threads, The Fila Olfactoria, Pass Out And Descend Into The Nasal Fossa Through The Apertures Of The Lamina Cribrosa. ...
Lobus Olfactorius Posterior
Lobus Olfactorius Posterior. The Substantia Perforata Anterior Is An Oblique Quadrangular Field Lying Behind The Trigonum Olfactorium, Between The Latter And The Tractus Opticus. It Exhibits Numer Ous Small Openings For The Passage Of Blood Vessels, Especially In Its Anterior Part In The Vicinity Of The Trigonum. This Front Part ...
Long Tracts
Long Tracts. The Fibres Pass From The Cortex Through The Internal Capsule To The Crusta Or Basis Pedunculi Cerebri, To End Within The Pons, The Medulla Oblongata And The Spinal Cord. The Chief Tracts Are :— 1. The Frontal Pantile Tract. The Fibres Arise Within The Cortex Of The Fron ...
Medulla Oblongata
Medulla Oblongata. The Upper Boundary Of The Medulla Oblongata Is Marked Ventrally By The Inferior Edge Of The Pons And Dorsally By The Striae Acusticae In The Floor Of The Fourth Ventricle ; The Lower Boundary Is Indicated By The Attachment Of The Upper Root-bundles Of The First Cervical Nerves, ...
Nervus Acusticus
Nervus Acusticus. The Acoustic Nerve Consists Of Two Parts, The Nervus Cochleae And The Nervus Vestibuli. C. Nervus Cochleae. This Nerve Takes Origin Within The Ganglion Spirale Cochleae. The Peripherally Directed Fibres Of These Bipolar Ganglion Cells Run To The Auditory Cells Within The Organ Of Corti; The Centrally Directed ...
Nervus Facialis And Nervus
Nervus Facialis And Nervus Intermedius Wrisbergi. The Facial Nerve Arises In The Nucleus Nervi Facialis, Which Lies Within The Ventral Area Of The Pontile Tegmentum, Ventro-lateral To The Abducent Nucleus. The Fibres Spring Ing From The Nucleus First Proceed Dorsally, Pass Around The Nucleus Of The Abducent Nerve—the Facial Knee ...
Nervus Glossopharyngeus And Vagus
Nervus Glossopharyngeus And Vagus. 1. Motor Portion. The Efferent Fibres Arise Partly Within The Nucleus Motorius Dorsalis Nervi Vagi El Glossoftharyngei, Which Lies In The Floor Of The Fourth Ventricle Lateral To The Hypoglossal Nucleus And Medial To The Nucleus Alae Cinereae ; The Larger Part Of The Fibres, However, ...
Nervus Oculomotorius
Nervus Oculomotorius. The Oculomotor Nerve Arises In The Nucleus Nervi Oculomotorii, Which Lies In The Region Of The Superior Colliculus, Ventral To The Aquaeductus Sylvii, Within The Floor Of The Central Gray Substance (figs. 88 And 89). The Nucleus Consists Of A Medially Placed Medial Nucleus And A Pair Of ...
Nervus Opticus
Nervus Opticus. The Fibres Of The Optic Nerve Arise Within The Retina And Are The Axones Of • The Ganglion Cells Located Within The Ganglion-cell Layer Of The Nervous Tunic Of The Eye. They Extend To The Chiasm. Here, One Part Of The Fibres Passes To The Tractus Opticus Of ...
Nervus Trigeminus
Nervus Trigeminus. Here A Motor Part And A Sensory Part Are To Be Distinguished (figs. 163 And 164). T. Motor Portion. The Central Neurone Takes Origin In The Cerebral Cortex Of The Lower Third Of The.central Convolutions, Passes With The Pyramidal Tracts Downward And Ends In The Chief Motor Nucleus, ...
Pars Optica Hypothalami
Pars Optica Hypothalami. This Division Of The Telencephalon Includes : The Lamina Terminalis, The Chiasma Opticum, With The Tractus Optici, The Tuber Cinereum, The Infundibulum, The Hypophysis. The Lamina Terminalis, Or End Plate, Rises As A Thin Sheet In Front Of The Chiasma Opticum And Continues In Front Of The ...
Pedunculi Cerebri
Pedunculi Cerebri. The Cerebral Peduncles, With The Substantia Perforata Posterior, Form The Ventral Portion Of The Mid-brain And Are Bounded By The Optic Tract In Front And By The Pons And Its Peduncles Behind (figs. 15 And 75). Cross-sections Of The Mid-brain Show A Subdivision Of The Cerebral Peduncle Into ...
Pons Varolii
Pons Varolii. We Distinguish A Pars Dorsalis And A Pars Basalis Pontis. The Pars Dorsalis Corresponds To The Pars Intermedia Of The Floor Of The Fourth Ventricle. The Pars Basalis Forms A Broad White Bolster, That Expands Transversely And Is Bounded In Front By The Cerebral Peduncles And Behind By ...
Short Tracts
Short Tracts. Z. Fibres Passing From All Parts Of The Cortex To The Thalamus And, Vice Versa, From The Thalamus To The Cortex—tractus And Or The Peduncles Of The Thalamus. Such Connections Include : A. The Cortex Of The Frontal Lobe With The Anterior End Of The Thalamus ; B. ...
Size And Weight Of
Form, Size And Weight Of The Brain. The Brain Possesses In A General Way The Form Of The Cranial Cavity. It Is Applied So Closely To The Inner Wall Of The Skull, That A Cast Of The Cranial Cavity Repeats To A Considerable Degree The Form Of The Brain. Corresponding ...
Summary Of The Diencephalon
Summary Of The Diencephalon. The Diencephalon Or Inter-brain Is Subdivided Into The Thalamencephalon And The Pars Mamillaris Hypothalarni. A. The Thalamencephalon Includes : The Thalamus, The Epithalamus, The Metathalmus. To The Epithalamus Belong : The Corpus Pineale, The Regio Habenulae—trigonum Habenulae, Commissura Habenularum, The Commissura Posterior. To The Metathalamus Belong ...
Summary Of The Rhombencephalon
Summary Of The Rhombencephalon. To The Rhombencephalon Or Hind-brain Belong :. The Isthmus Rhombencephali, The Metencephalon, The Myelencephalon. It Encloses The Fourth Ventricle. To The Isthmus Rhombencephali Belong : Dorsal—the Brachia Conjunctiva Cerebelli, The Velum Medullare Anterius, The Trigonum Lemnisci ; Ventral—the Crura Cerebri. To The Metencephalon Belong : The ...
Summary Of The Telencephalon
Summary Of The Telencephalon. The Telencephalon, Or End-brain, Forms The Most Anterior And Largest Division Of The Encephalon And Comprises The Hemisfihaerium, And The Tars °pica Hyfiothalami. A. The Hemisphaerium Includes : The Pallium Or The Cerebral-mantle, The Rhinencephalon Or The Olfactory Brain, The Stem Of The End-brain. The Two ...
Thalamencephalon
Thalamencephalon. The Thalamus Opticus (figs. 56 And 57) Presents An Ovoid Mass Of Gray Sub Stance, With The Thicker End Behind. Its Dorsal And Medial Surfaces Are Free, While Its Lateral And Ventral Ones Are Fused With The Neighboring Structures. The Dorsal Surface Is Slightly Convex And Covered By A ...
The Cerebellum
The Cerebellum. The Cerebellum, Or Little Brain, Is A Medially Situated Structure Of Kidney-like Form. It Underlies The Occipital Lobes Of The Cerebrum, From Which It Is Separated By The Large Transverse Fissure, And Lies Behind The Pons And The Corpora Quadrigemina And Above The Medulla Oblongata. We Distinguish An ...
The Fibre Tracts
The Fibre-tracts. The Older Anatomists Contented Themselves With The Task Of Describing The Brain Simply From The Exterior And, In A Sense, Without Further Leading Conceptions. In This Period Originated The Terminology That Owes Its Existence To Merely Purely Superficial And Accidental Resemblances. As Examples, One Recalls The Designation Of ...
The Gray Masses Of
The Gray Masses Of The Mid—brain. Surrounding The Aquaeductus Cerebri Is The Central Gray Substance, Stratum Gris Eum Centrale. At The Bottom Of This Stratum, At The Level Of The Superior Colliculi, Lies The Oculomotor Nucleus, Which Joins The Upward Prolongation Of The Small Nucleus Nervi Trochlearis (figs. 88 And ...
The Gray Masses Of_2
The Gray Masses Of The Rhombencephalon. In The Floor Of The Trigonum Lemnisci, In The Isthmus, Lies The Nucleus Lemnisci. The Pons Includes A Larger Ventral Portion, The Pars Basilaris Ponlis, And A Smaller Dorsal One, The Pars Dorsalis Ponlis. These Two Divisions Are Readily Seen In A Cross Section. ...
The Gray Substance
The Gray Substance. Exclusive Of The Supporting Tissue, The Gray Substance Consists Principally Of Nerve Cells With Their Protoplasmic And Nerve-processes And Nerve-fibres Ending Around The Nerve-cells. Topographically Regarded, Four Different Cell-groups May Be Distinguished. Thus, In The Anterior Horn In The Cervical And Lumbar Enlargements, A And A And ...
The Lateral Ventricle
The Lateral Ventricle. In Each Lateral Ventricle We Distinguish Three Outpouchings Or Horns, The Cornu Ante Rius, The Cornu Posterius And The Cornu Inferius, Invading The Frontal, Occipital And Temporal Lobes Respectively, And The Middle Chief Part Or Body, The Pars Centralis, Uniting The Three Horns. The Front Horn, The ...
The Medulla Oblongata
The Medulla Oblongata. The Medulla Oblongata Forms The Transition From The Spinal Cord To The Brain. The Intimate Make-up, Relatively Simple Within The Spinal Cord, At The Same Time Undergoes Manifold Modifications. Not Only Does The Gray Substance Change Its Form, But New Masses, Large And Small Nuclei, Appear. Coincidentally, ...
The Membranes Of The
The Membranes Of The Spinal Cord. As Is The Brain, So Also The Spinal Cord Is Surrounded By Three Envelopes—the Dura Mater, The Arachnoid And The Pia Mater. Dura Mater Spinalis. This Membrane Forms A Strong Fibrous Investment Consist Ing Of Two Layers, The Outer, Which Fuses With The Periosteum ...
The Motor Centre
The Motor Centre. According To The Newer Investigations, The Motor Centre Embraces Especially The Anterior Central Or Precentral Convolution, And, Further, The Posterior Part Of The Frontal Lobe And The Lobulus Paracentralis. It Includes The Following Regions. A. Upper Region : Lobulus Paracentralis And The Upper Quarter Of The Precentral ...
The Nuclei Of The
The Nuclei Of The Diencephalon. The Thalamus. The Thalamus Consists Of Three Chief Nuclei, The Nucleus Anterior, The Nucleus Medialis And The Nucleus Lateralis, Which Are Imperfectly Separated From One Another By White Medullary Stripes, The Laminae Medullares. The Nucleus Anterior Includes The Front And Dorsal Portion Of The Thalamus ...
The Sensory Centres
The Sensory Centres. A. The Sensory Area, Including The Centres For Touch, Pain And Temperate Sensi Bility, Embraces Especially The Postcentral Convolution And The Adjoining Anterior Part Of The Parietal Lobe And, Perhaps, Even Extends Onto The Precentral Convolution. The Position- And Movement-sensibility, As Well As Space- And Orientation-sense, Are ...
The Speech Centres
The Speech Centres. The Speech Centre In Its Entirety Includes Certain Cortical Areas Of The Lateral Surface Of The Hemisphere And, In Right-handed Individuals, Is Located On The Left Side. A. The Motor Speech Centre, Broca's Centre Presiding Over The Ability To Speak, Lies Within Broca's Convolution Embracing The Base ...
Tracts Of The Lateral
Tracts Of The Lateral Column. The Tractus Lateralis Or The Lateral Pyramidal Tract Extends As A Robust Bundle In The Dorsal Part Of The Lateral Column. The Termination Of The Fibres Is In The Anterior Horn Of The Same Side Of The Cord. The Tractus Dorsalis Or Direct Cerebellar Tract ...
Tracts Of The Posterior
Tracts Of The Posterior Column. The Posterior Column Is Composed, In Largest Part, Of The Continuations Of The Sensory Posterior Root-fibres, That Proceed From The Spinal Ganglia (fig. 150). The Cells Of The Latter Give Off A Nerve-process, Which Soon Divides Into Two Branches, One Passing Peripheral Ward And The ...
Ventriculus Quartus
Ventriculus Quartus. Isthmus, Metencephalon And Myelencephalon Together Surround The Fourth Ventricle, A Cavity Filled With A Small Amount Of Cerebrospinal Fluid, Which Below Passes Into The Central Canal Of The Spinal Cord And Above Is Continuous With The Sylvian Aqueduct. Three Segments Are Distinguished, The Pars Inferior, The Pars Intermedia ...
Ventriculus Tertius
Ventriculus Tertius. The Third Ventricle Is A Median Inpaired Cleft-like Cavity, That Communicates In Front With The Lateral Ventricles By Means Of The Foramen Interventriculare Or Foramen Of Monro, And Behind With The Fourth Ventricle By Means Of The Aquaeductus Cerebri Or Sylvian Aqueduct. The Front Wall Is Formed, In ...
Worm Hemisphere
Worm Hemisphere Lingula .... Vinculum Lingulae Lobulus Centralis Ala Lobuli Centralis Culmen Lobus Quadrangularis Pars Anterior Monticulus Declive T Pars Posterior The Lingula Lies Deeply Placed In The Incisura Cerebelli Anterior And Consists Of From Four To Six Or Eight Small Lamellae, Which Rest Upon And Are Fused With The ...
Worm Hemisphere_2
Worm Hemisphere Pyramis Lobulus Biventer Uvula Tonsilla Nodtiltis . Flocculus The Pyramid, Separated From The Tuber Vermis By The Sulcus Postpyramidalis, Connects The Biventral Lobule Of The One Side With That Of The Other. A Fissure Splits Each Lobulus Biventer Into Two Portions, An Anterior Medial And A Posterior Lateral. ...