Some Peripheral Nerves
The normal peripheral nerve is white, faintly cross-striated, and uniformly wide. In Marek disease (neural lymphomatosis) this appearance is altered, especially in the nerves of the limbs.
The following nerves are usually examined at necropsy. The cervical nerves emerge from the cervical muscles and pass to the skin at right angles to the neck (Fig. 37.15/4'). The vagus nerve (Fig. 37.15/6) accompanies the jugular vein. The cervical sympathetic trunk lies deep to the muscles. The vagus is seen again on the dorsal surface of the proventriculus (Fig. 37.21A/3). The brachial plexus is exposed on each side of the cervical muscles when the esophagus, trachea, and major vessels cranial to the heart are reflected. Most branches pass into the wing ventral to the scapula and caudal to the humerus. The intercostal nerves are exposed by the removal of the lungs. The intestinal nerve (Fig. 37.21/14) accompanies the cranial mesenteric vessels in the mesentery. Nerves of the lumbar and synsacral plexuses pass through the kidney, which must be removed to expose them (Fig. 37.29/10 and 17). Finally, the sciatic nerve can be examined on the medial surface of the thigh by reflecting two thin muscles (Fig. 37.21A/15).
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