. The anatomy of the domestic animals. Veterinary anatomy. Fig. 626.—Ventral View of Medulla Oblongata AND First and Secoxd Segments of Spinal Cord of Horse; the Membranes are Cut and Reflected. 1, Lig. auspensorium arachnoideale; 2, right cere- brospinal artery; 3, 5, digitations of lig. denticulatum; 4. free border of lig. denticulatum; 6, middle spinal arter>-; 7, basilar artery; S, pons; 9, arachnoidea; 10, dura mater; 11, 12, ventral root-bundles of first and second segments of spinal cord; T'/, N. abducens; IX, X, glosso-phar>'ngeus and vagus; XI, accessorj-, medullarj- part; ,Y7',
. The anatomy of the domestic animals. Veterinary anatomy. Fig. 626.—Ventral View of Medulla Oblongata AND First and Secoxd Segments of Spinal Cord of Horse; the Membranes are Cut and Reflected. 1, Lig. auspensorium arachnoideale; 2, right cere- brospinal artery; 3, 5, digitations of lig. denticulatum; 4. free border of lig. denticulatum; 6, middle spinal arter>-; 7, basilar artery; S, pons; 9, arachnoidea; 10, dura mater; 11, 12, ventral root-bundles of first and second segments of spinal cord; T'/, N. abducens; IX, X, glosso-phar>'ngeus and vagus; XI, accessorj-, medullarj- part; ,Y7', accessorj-, spinal part; a, line between medulla oblongata and spinal cord. (Dexler, in Ellenberger-Baum, Anat. d. Haustiere.) Fig. 627.—Cauda EqtnNA. 1, Dura and arachnoidea divided and reflected; Zt spina! cord; 3, nerve-roots. (From '3 Atlas, re- duced.) The surface of the spinal cord is divided into two similar halves by a dorsal median groove and a ventral median fissure. On either side of the former is the dorso-lateral groove (Sul- cus dorsalis lateralis), at which the fibers of the dorsal nerve-roots enter the cord; it is faint except at the enlargements, and is represented by two grooves in the first cervical segment. The ventral root-fibers as they emerge from the cord do not form a continuous series, but arise from a zone (Area radicularis ventralis) 3 to 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia, London, W. B. Saunders Company
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