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Anatomy of the Brain

Sensory Nerves And Sensory
Sensory Nerves And Sensory Roots Nervus Terminalis.—the Terminal Nerve Has Been Found In Fishes, Am Phibia, Reptiles And Mammals; It Is Present But Vestigial In Man. It Is A Plexiform Nerve Coursing Along The Surface Of The Gyrus Rectus, Medial To The Olfactory Bulb And Tract; And, Continuing Through The ...

Sensory Or Corticipetal Projection
Sensory Or Corticipetal Projection Fibers The Sensory Or Corticipetal Projection Fibers Of The Tegmentum Comprise The Medial, Superior And Lateral Fillets; The Spino Thalamic Tract; The Brachium Conjunctivum Of The Cerebellum; A Part Of The Medial Longitudinal Bundle; And Certain Other Ascending Fibers Of The Formatio Reticularis. Excepting A Small ...

Superior Surface Of The
Superior Surface Of The Cerebellum The Superior Surface Of The Cerebellum (facies Cerebelli Su Perior) Is Bounded By The Horizontal Sulcus And The Superior Lamina Of The Medullary Body (figs. Lox And 104). The Posterior And Larger Part Of This Surface Is Covered By The Tentorium Cerebelli, The Tentorial Area; ...

Surface Of
Surface Of The Exterior Surface Of The Fore-brain Is Divided By Distinct Borders Into Three Regions, Namely, The Convex Surface, The Medial Surface, And The Basal Surface (figs. 26, 31 And 33). The Basal Surface Comprises The Orbital And Tentorial Areas, Separated By The Stem Of The Fissura Cerebri Lateralis ...

The Arachnoid Of The
The Arachnoid Of The Brain (arachnoidea Encaphali) The Arachnoid Is Present Only In Mammals. It Is Produced By The Delamination Of The Pia Mater, As That Is Seen In Birds And Reptiles. In Structure It Is A Delicate, Fibrous, Web-like Net Covered Externally With Endothelium. Internally It Is Joined To ...

The Base Of The
The Base Of The The Basal Or Inferior Surface Of The Fore-brain Comprises The Inferior Surface, First, Of The End-brain, Including The Pars Optica Hypothalami And The Cerebral Hemispheres; And, Second, Of The Inter-brain, Which Embraces The Pars Mammillaris Hypothalami. It Is Completely Exposed Only When A Section Is Made ...

The Cerebellum
The Cerebellum The Rhombencephalon Is Composed Of The Isthmus, The Cere Bellum, The Pons And The Medulla Oblongata (figs. 20, 21, And 33). It Is The Lozenge-shaped Brain. It Is Evolved From The Third Primary Brain-vesicle; Therefore, It Is The Hind-brain. In Con Trast With The Cerebrum, It Is The ...

The Cerebrum
The Cerebrum The Cerebrum With Its Great Hemispheres Is That Part Of The Brain Which Especially Characterizes Man. In Man Only Do The Hemispheres Reach Such Predominant Development. Though They Are Mere Outgrowths Of The Anterior Brain-vesicle In The Beginning, They Completely Overshadow All Other Parts Of The Brain By ...

The Circulation Of The
The Circulation Of The Rhombencephalon The Medulla Oblongata Is Supplied With Blood By The Following Branches Of The Vertebral Artery: The Posterior And The Anterior Spinal, The Posterior Inferior Cerebellar And Several Short Bulbar Arteries (fig. 9). The Posterior Inferior Cerebellar (a. Cerebelli Inferior Posterior) Winds From Before Backward Around ...

The Dura Mater Of
The Dura Mater Of The Brain Structure And Relations.—it Is A Very Dense And Inelastic Membrane (pachymeninx) Composed Of White Fibrous And Yellow Elastic Tissue Lined With Flat Endothelial Cells, Which Constitute Its Internal Surface. The Dura Of The Brain Is Made Up Of Two Layers Which Are Separable Up ...

The Fourth Ventricle
The Fourth Ventricle The Common Cavity Of The Rhombencephalon Is The Fourth Ventricle (ventriculus Quartus) (fig. Rr2). The Fourth Ventricle Is Dorsal To The Pons And Medulla, And Is Ventral To The Cere Bellum (fig. 104). It Is Broadest At The Junction Of The Pons And Medulla (figs. Ii 2 ...

The Lateral Ventricle
The Lateral Ventricle (ventriculus Lateralis) The Hemispheres Contain The Largest Of The Six Ventricles (figs. 37, 46, 53, 54 And 96). Situated One On Either Side Of The Median Line, The Ventricles Of The Hemispheres Are Very Naturally Called The Lateral Ventricles. Each Represents A Branch Of The Cavity Of ...

The Medulla Oblongata
The Medulla Oblongata Medulla Oblongata Is The Distal Or Caudal Part Of The Brain (figs. 21 And 33). It May Be Regarded As The Expanded Intracranial Portion Of The Spinal Cord, Hence The Synonym Spinal Bulb. It Occupies The Basilar Groove Of The Occipital Bone, Posterior To The Pons; And ...

The Pia Mater Of
The Pia Mater Of The Brain Structure And Relations.—it Is A Vascular Membrane Com Posed Of A Close Network Of Veins And Arteries Held Together By Fibro-elastic Areolar Tissue (fig. 9). The Endothelium Covering Its Outer Surface Is Continuous With That Ensheathing The Sub Arachnoid Trabecula. The Pia Closely Follows ...

The Pons Varolii
The Pons (varolii) The Pons And Medulla Form The Ventral Part Of The Rhomben Cephalon, The Cerebellum Being Its Dorsal Portion. By A Trans Verse Indentation Of Its Roof, The Posterior Brain-vesicle Is Par Tially Divided Into An Upper Vesicle, The Metencephalon, And A Lower Vesicle, The Myelencephalon; The Latter ...

The Spinal Cord
The Spinal Cord The Spinal Cord (medulla Spinalis) Is Developed From The Pos Terior Part Of The Neural Tube, And Forms The Corresponding Portion Of The Central Axis Of The Nervous System. Extent.—it Is Continuous With The Medulla Oblongata, Above; And, In The Adult, Reaches To The Lower Border Of ...

The Third Ventricle And
The Third Ventricle And The Inter-brain (diencephalon) Is Median In Position (figs. 33, 34, 35, 37 And 50). It Is Situated Beneath The Fornix And The Layer Of Epithelium Extending From The Border Of The Fornix To The Stria Terminalis. The Chorioid Tela Of The Third Ventricle Only Intervenes Between ...

Tracts Of The Spinal
Tracts Of The Spinal Cord The Antero-lateral Fasciculus Proprius (fasciculus Antero Lateralis Proprius) Occupies The Deep Part Of The Anterior And Lateral Columns (figs. 142 And 143). It Embraces The Anterior Columna Of Gray Matter And Covers The Outer Surface Of The Center Of The Crescent And The Base Of ...

Transverse Fibers Of Pons
Transverse Fibers Of Pons The Transverse Fibers Form Two Consecutive Layers In The Pons, Viz., The Basilar, And The Dorsal Layers. They Lie One Upon Another. The Former Are Situated In The Basilar Part Of The Pons, The Latter In The Dorsal Part (figs. 113-118). Basilar Fibers.—the Superficial Transverse Fibers ...

Veins Of The Cerebrum
Veins Of The Cerebrum The Internal Veins Of The Cerebrum.—the Veins Of The Cere Brum (vence Cerebri) Are Classed As Internal And External. The Trunks Of The Internal Veins Are Located Largely In The Chorioid Tela Of The Third Ventricle, Near The Apex Of Which The Internal Cerebral Vein Is ...

Ventricles And Gross Structure
Ventricles And Gross Structure Of The Fore-brain The Ventricles Of The Fore-brain Comprise The Third Ventricle, The Aula, The Interventricular Foramina And The Two Lateral Ventricles. The Third Is The Ventricle Of The Inter-brain. It Communicates Posteriorly With The Fourth Ventricle Through The Cerebral Aqueduct; Anteriorly It Is In Direct ...

White Matter Of Medulla
White Matter Of Medulla The Medulla Is Made Up Of White And Gray Matter Which To Gether Bound Ventrally And Laterally The Inferior Part Of The Fourth Ventricle And Surround The Upper Extremity Of The Central Canal Which Is Continuous With That Of The Spinal Cord. For The Most Part ...

White Matter Of The
White Matter Of The Cord The White Matter (fig. 140) Of The Spinal Cord (substantia Alba Spinalis) Is Disposed In Its Peripheral Area And In The White Ante Rior Commissure. It Is Composed Of Medullated Nerve Fibers (axones And Collaterals) Imbedded In A Small Amount Of Neu Roglia, And Supported ...