. Quain's elements of anatomy . nd-brain ; H, jjart of theheart seen bulging to the right side ; Vo7n,omphalo-mesenteric or vitelline veins enter-ing the heart posteriorly ; Mr, medullarycanal, spinal part; 3Ir, medullary wall ofthe mid-biain ; Uw, proto-vertebral somites. vesicles are thrown more backwardsand downwards by the developmentof the cerebral vesicles. As the cerebral vesicles becomeenlarged, the cranial wall undergoesa corresponding expansion in theforepart of the head, the cavitiesof the lateral ventricles extend intotheir interior, and the vesicle of thethalamencephalon, which Av
. Quain's elements of anatomy . nd-brain ; H, jjart of theheart seen bulging to the right side ; Vo7n,omphalo-mesenteric or vitelline veins enter-ing the heart posteriorly ; Mr, medullarycanal, spinal part; 3Ir, medullary wall ofthe mid-biain ; Uw, proto-vertebral somites. vesicles are thrown more backwardsand downwards by the developmentof the cerebral vesicles. As the cerebral vesicles becomeenlarged, the cranial wall undergoesa corresponding expansion in theforepart of the head, the cavitiesof the lateral ventricles extend intotheir interior, and the vesicle of thethalamencephalon, which Avas at firstthe foremost part of the embryo-head, is thrown backwards into asomewhat deeper position. The middle encephalic vesicle, in-creasing greatly in size, takes themost prominent part of the headsuperiorly, both from its own greaterrelative magnitude, and from thesudden bend which the head nowtakes below this vesicle in the greatcranial flexure. The formation of the cerebellum begins by a thickening in the upper Fig.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
