. The anatomy of the domestic animals. Veterinary anatomy. 766 NERVOUS SYSTEM OF THE HORSE mm. in wdth, a little lateral to the ventral median fissure, and no groove is found here. In the greater ])art of the cervical region and the anterior part of the thoracic region there is a shallow dorsal intermediate groove (Sulcus intermedius dorsalis) a short distance lateral to the median groove. These grooves indicate the division of the white matter of the cord into columns to be described later. Examination of cross-sections of the spinal cortl shows that it is a bilaterally symmetrical structure,
. The anatomy of the domestic animals. Veterinary anatomy. 766 NERVOUS SYSTEM OF THE HORSE mm. in wdth, a little lateral to the ventral median fissure, and no groove is found here. In the greater ])art of the cervical region and the anterior part of the thoracic region there is a shallow dorsal intermediate groove (Sulcus intermedius dorsalis) a short distance lateral to the median groove. These grooves indicate the division of the white matter of the cord into columns to be described later. Examination of cross-sections of the spinal cortl shows that it is a bilaterally symmetrical structure, incompletely divided into right and left lialves by a ventral fissure and a dorsal septum. The ventral median fissure (Fissura mediana ven- tralis) is narrow and penetrates nearly to the middle of the dorso-ventral tliameter of the cord. It is occupied by a fold of i)ia mater. The dorsal median septum (Sejjtum metlianum dorsale) is a partition which descentls from the dorsal median groove to about the middle of the cord. It apparently consists of condensed neu- roglia with an admixture of pial tissue. The two halves of the cord are connected. ;, Dorsal I wliito ( 13, spii . —Cross-i nm; -', coli S, central canal; i; 14. spinal nerve Spinal Cord in situ. Enlarged and in 1 ;in; 3, ventral column; -i. Jorsal horn; o, ventr; dorsal septum: iO, ventral fissure; ii, dorsal nei 15, intervertebral foramen; 16, arch of vertebrj RT Schematic. horn: G, gray commissure; 7, s-root; /^, ventral nerve-root. 17, epidural space; IS, dura mater (represented a little too thick); 19, ligamentum denticulatum; 30, BO, longitudinal venous sinuses; 21, middle spinal artery: 22, body of vertebra. The subdural and subarachnoid spaces G^Iack) are traversed by delicate trabec- ulffi. The outer part of the arachnoid and the pia mater are not shown. l)y commissures of gray and white matter. The gray commissure (Commissura grisea) is a transverse band of gray matter at the ventral entl of th
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
