. The anatomy of the domestic animals. Veterinary anatomy. 690 BLOOD-VASCULAR SYSTEM OF THE HORSE. the dorsal longitudinal ligament. They are continuous in front with the basilar plexus. They lie in the grooves on the bodies of the vertebrae and are connected lay a series of transverse anastomoses which pass between the central part of the bodies of the vertebrae and the dorsal longitudinal ligament or in channels in the bone. They receive veins from the spinal cord, the meninges, and the bodies of the vertebrae (Vense basis vertebrae). Through the intervertebral foramina efferent vessels conn
. The anatomy of the domestic animals. Veterinary anatomy. 690 BLOOD-VASCULAR SYSTEM OF THE HORSE. the dorsal longitudinal ligament. They are continuous in front with the basilar plexus. They lie in the grooves on the bodies of the vertebrae and are connected lay a series of transverse anastomoses which pass between the central part of the bodies of the vertebrae and the dorsal longitudinal ligament or in channels in the bone. They receive veins from the spinal cord, the meninges, and the bodies of the vertebrae (Vense basis vertebrae). Through the intervertebral foramina efferent vessels connect with the occipital, vertebral, intercostal, lumbar, and lateral sacral veins. The veins of the spinal cord are drained by dorsal and ventral longitudinal trunks. The ventral vein, which is the smaller, j^V:^' accompanies the ventral spinal artery. VEINS OF THE THORACIC LIMB The brachial vein (V. brachialis) (Fig. 566) is the satellite of the extrathoracic part of the brachial artery. It arises at the medial side of the distal end of the shaft of the humerus and ascends in the arm behind the artery under cover of a layer of fascia and the posterior superficial pectoral muscle. At the shoulder it is ventral to the artery, crosses the anterior border of the first rib, and concurs with its fellow and the two jugu- lars in the formation of the anterior vena cava. The roots of the vein are somewhat variable, but most often four veins in addition to a large ob- lique branch from the cephalic unite in its format tion; two or three of these radicles are satellites of the median artery. Its tributaries correspond in general to the branches of the artery, but a few differences are worthy of notice. The thoraco- dorsal vein (V. thoracodorsalis) often joins the external thoracic or the deep brachial vein. The external thoracic vein (V. thoracica externa)' is a large vessel which arises in the ventral wall of the abdomen, passes forward (embedded partly in the cutaneus muscle) along the
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