The anatomy of the nervous system, from the standpoint of development and function . e cavity of the ventricle is in communica- 126 THE NERVOUS SYSTEM tion with the subarachnoid space, and cerebrospinal fluid may escape from theformer into the latter. The floor of the fourth ventricle is known as the rhomboid fossa and is formedby the dorsal surfaces of the pons and open part of the medulla oblongata, whichare continuous with each other without any line of demarcation and are irreg-ularly concave from side to side (Figs. 89, 91). The fossa is widest opposite thepoints where the restiform bodie
The anatomy of the nervous system, from the standpoint of development and function . e cavity of the ventricle is in communica- 126 THE NERVOUS SYSTEM tion with the subarachnoid space, and cerebrospinal fluid may escape from theformer into the latter. The floor of the fourth ventricle is known as the rhomboid fossa and is formedby the dorsal surfaces of the pons and open part of the medulla oblongata, whichare continuous with each other without any line of demarcation and are irreg-ularly concave from side to side (Figs. 89, 91). The fossa is widest opposite thepoints where the restiform bodies turn dorsally into the cerebellum; and itgradually narrows toward its rostral and caudal angles. The lateral boundaries Thalamus Medial geniculate bod\ Inferior quadrigeminal __--- ~\brachium Frenulum veli Anterior medullary velum Braeliium eonjunetivum — Braeliium pontis~-~~- -Restiform body~ Superior fovea \T Area acustica-=~^. Inferior fovea Restiform body— - Ala cinerea--- Funieulus scparans— Area postrema- Obex- Funiculus gracilis- Funiculus cuneatus-- Pineal body. - Superior colliculus Inferior colliculus — Cerebral peduncle Trochlear nerve Median sulcus Locus carulcus - - Facial colliculus i Medial eminence Sulcus limilans Lateral recess Stricr mcdullaresTeen ia Trigonum hypoglossi~Cuneatc tubercle~~~Tubcrculum cinereum-Clava --Posterior median fissure~^Posterior intermediatesulcus^Posterior lateral sulcus Fig. 89.—Dorsal view of human brain stem. of the fossa, which are raised some distance above the level of the floor, areformed by the following structures: the brachia conjunctiva, restiform bodies,cuncatc tubercles, and clavce. Of the four angles to the rhomboid fossa, twoare laterally placed and correspond to the lateral recesses. At its caudal anglethe ventricle is continuous with the central canal of the closed part of the me-dulla oblongata, and at its rostral angle with the cerebral aqueduct. Joiningthe two last named angles there is a median sulcu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
