. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 'At> ,i>' Fig. 7-7. Isolated testis, vaginal tunic opened. 1 deferent duct, 2 mesoductus deferens, 3 mesorchium, 4 cremaster m., 5 parietal layer of vaginal tunic, 6 ligament of the tail of epididymis, 7 tail of epididymis, 8 proper ligament of testis, 9 testis, 10 body of epididymis, 11 efferent ductules, 12 head of epididymis. The external cremaster muscle inserts on the ex- ternal surface of the vaginal tunic. Blood supply: The testis is supplied by the tes- ticular artery and drained by the testicular vein. The tortuous
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 'At> ,i>' Fig. 7-7. Isolated testis, vaginal tunic opened. 1 deferent duct, 2 mesoductus deferens, 3 mesorchium, 4 cremaster m., 5 parietal layer of vaginal tunic, 6 ligament of the tail of epididymis, 7 tail of epididymis, 8 proper ligament of testis, 9 testis, 10 body of epididymis, 11 efferent ductules, 12 head of epididymis. The external cremaster muscle inserts on the ex- ternal surface of the vaginal tunic. Blood supply: The testis is supplied by the tes- ticular artery and drained by the testicular vein. The tortuous vessels are visible between the peritoneal covering of the testis and the tunica albuginea, me- dial to the epididymis. Innervation: The testis is innervated by the sym- pathetic nervous system. The nerve fibers accom- pany the testicular blood vessels. Lymph drainage: Lymphatics accompany the blood vessels and drain into the renal or lumbar lymph nodes. The epididymis (Figs. 7-6 and 7-7) is composed of a long, convoluted tube, ductus epididymidis. It lies along the dorsolateral border of the testis and is divided into a head, a body and a tail. The head of the epididymis, caput epididymidis, begins on the medial surface of the testis, and curves around the cranial extremity to attain a dorsolateral position. It is very loosely attached to the cranial extremity of the testis by the visceral layer of the vaginal tu- nic, blood vessels and efferent ductules. The blood vessels and nerves of the testis lie medial to the head of the epididymis. The body of the epididy- mis, corpus epididymidis, passes along the dorsolat- eral border of the testis, and is about 20 mm long and 2 mm wide. It is attached to the testis by a fold of vaginal tunic, the mesepididymis. The tail of the epididymis, cauda epididymidis, is loosely attached to the caudal extremity of the testis by the proper ligament of the testis, lig. testis proprium, and to the parietal layer of the vaginal tunic by the ligame
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