. The anatomy of the domestic animals. Veterinary anatomy. 822 NERVOUS SYSTEM OF THE HORSE THE LUMBAR NERVES There are six pairs of lumbar nerves (Nn. luml:)ales) in the horse, the last of which emerge between the last lumbar vertelira and the sacrum. The anterior two or three are about the same size as the thoracic nerves, but the others are much larger. Their dorsal branches are small in comparison with the ventral ones. They are distributed to the muscles and skin of the loins and croup in a fashion similar to those of the thoracic nerves. The ventral branches are connected with the sympath
. The anatomy of the domestic animals. Veterinary anatomy. 822 NERVOUS SYSTEM OF THE HORSE THE LUMBAR NERVES There are six pairs of lumbar nerves (Nn. luml:)ales) in the horse, the last of which emerge between the last lumbar vertelira and the sacrum. The anterior two or three are about the same size as the thoracic nerves, but the others are much larger. Their dorsal branches are small in comparison with the ventral ones. They are distributed to the muscles and skin of the loins and croup in a fashion similar to those of the thoracic nerves. The ventral branches are connected with the sympathetic by small rami communicantes, and give branches to the sublumbar muscles. Those of the first two nerves are arranged in a manner analogous to the corresponding branch of the last thoracic nerve. The ventral branch of the first lumbar nerve is termed the ilio-hypogastric nerve (N. iliohypogastricus). It passes outward between the quadratus luni- Cnira of diaphragm: Diaphragm Last thoracic neri' Ilio-hypogastric nerve IHo-inguinal nerve—f External spermatic nerve External cutaneou: nerve. Spla7ichnic nerve Last intercostal arteries First lumbar arteries Attachments of psoas major Body of vertebra External spermatic nerve Trunk of lumbar arteries Sixth lumbar artery Sympathetic trunks Insertion of quad- ratus lumhorum Anterior part of I, lumbosacral plexus [' '. Obturator nerve — Femoral nerve Fig. 656.—Lumbar Nerves of Horse; Ventral View. (After St-hmaltz, Atlas d. Anat. d. Pferdes.) - Ventral sacro-iliac ligament borum and the psoas major, and divides at the lateral border of the latter into a superficial and deep branch. The superficial or cutaneous branch passes over the dorsal edge of the internal oblique, ilescends between that muscle and the external oblique, perforates the latter, and runs doAvnward and backward and ramifies under the skin of the posterior part of the flank and the lateral surface of the thigh. It gives branches to the transversus and obliqu
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