. The anatomy of the domestic animals . Veterinary anatomy. THE FOURTH VENTRICLE 779 and is marked by three longitudinal furrows which converge behind. It is widest and deepest a little in front of its middle. The posterior part narrows to a point at the opening of the central canal of the spinal cord, and on account of its appearance in man it has been termed the calamus scriptorius. The median sulcus (Sulcus medianus) extends the entire length of the floor and is deepest toward the ends. The limiting sulci (Sulci hmitantes) begin on either side of the opening of the central canal and extend
. The anatomy of the domestic animals . Veterinary anatomy. THE FOURTH VENTRICLE 779 and is marked by three longitudinal furrows which converge behind. It is widest and deepest a little in front of its middle. The posterior part narrows to a point at the opening of the central canal of the spinal cord, and on account of its appearance in man it has been termed the calamus scriptorius. The median sulcus (Sulcus medianus) extends the entire length of the floor and is deepest toward the ends. The limiting sulci (Sulci hmitantes) begin on either side of the opening of the central canal and extend forward as the lateral limits of the rhomboid fossa. Just beyond the middle of the fossa they expand into a shallow depression, the anterior fovea (Fovea oralis). On either side of the median sulcus and margined laterally by the limiting sulcus is a slightly rounded column, the eminentia medialis. Opposite the fovea this presents an elongated prominence, the colliculus facialis, so named be- cause it overlies the bend formed by the fibers of origin of the facial nerve. Lateral to the limiting sulcus is a long fusiform elevation, the area acustica, from which a band of fibers (Stride acusticse) winds over the anterior end of the restif orm body to the superficial origin of the cochlear nerve. The lateral wall is formed by the restif orm body and the anterior peduncle of the cerebellum. The roof (Tegmen ventriculi quarti) is formed in its middle part by the vermis. S T t Fro, 636.—^Brain Stem akb Basal Ganglia of Horse; Right View. , External arcuate fibers; Cr., corpus restiforme; P, pyramid; T, corpus trapezoideum; B. p., middle pe- duncle of cerebellum; P. c, cerebral peduncle; 5, sulcus lateralis; T.^., tractus tranaversua; L, trigonum lemnisci; , corpus quad, ant.; , corpus quad, post.; B, commissure of ; G, corpus geniculatum mediale; , olfactory peduncle; , olfactory bulb. of the cerebellum, covered by the epithelium before mentioned. There is com
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