. The anatomy of the domestic animals . Veterinary anatomy. 778 NERVOUS SYSTEM OF THE HORSE to the tegmentum of the cerebral peduncle, the hypothalamic region, and the thalamus. After the peduncles disappear under the corpora quadrigemina, they converge and many of their fibers intercross, forming the decussation of the anterior peduncles. A considerable number of fibers end in the nucleus ruber. Thence impulses are transmitted in two directions: first, by thalamo- cortical fibers to the cerebral cortex; second, by the rubro-spinal tract through the brain stem and lateral columns of the cord t
. The anatomy of the domestic animals . Veterinary anatomy. 778 NERVOUS SYSTEM OF THE HORSE to the tegmentum of the cerebral peduncle, the hypothalamic region, and the thalamus. After the peduncles disappear under the corpora quadrigemina, they converge and many of their fibers intercross, forming the decussation of the anterior peduncles. A considerable number of fibers end in the nucleus ruber. Thence impulses are transmitted in two directions: first, by thalamo- cortical fibers to the cerebral cortex; second, by the rubro-spinal tract through the brain stem and lateral columns of the cord to the ventral horn cells. The ventro-lateral cerebellospinal fasciculus (GoAvers' tract) is an ill-defined tract which connects the spinal cord with the cere- bellum. Its fibers appear to be axones of cells of the dorsal columns of the cord; they pass in the lateral column of the cord, become scattered in passing through the reticular formation of the medulla and pons, and enter the cerebellum by way of the anterior medullary velum. The Fourth Ventricle The fourth ventricle (Ventriculus qiiartus) is the cavity of the rhombencepha- lon; it communicates with the central canal of the spinal cord behind and through Corpus callosum {section) Lateral ventrich Plexus chorioideus Corpus qnailrigeniiiiam aiUerius Corpus quadrigeminum poslerius Tuberculum acusticum Tcsnia ventriculi quarti. Septum pelluciduin Nucleus caudatus Thalamus {anterior tubercle) Stria termincdis Corpus geniculatum laterale Corpus genicidatum mediale Pedunculus cerebri Velum niedullare aiiterius Brachium conjunctivum Brachium pontis Corpus restiforme Calamus scriplorius Tuberculum cinereum Fissura mediana Fig. 635.—Dissection of Br.\in Stem axd B.\sal of Horse; Dorsal View. 1, Columns of fornix (section); £, remnant of hippocampus; 3, tsenia thalami; .^, pineal body; o, eminentia medialis; 6, sulcus medianus; 7, sulcus limitans; , third ventricle; , fourth ventricle. Stumps of cranial ner
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