. Chordate anatomy. Chordata; Anatomy, Comparative. THE UROGENITAL SYSTEM 313 ous tubules. Diminution in the activity of the tubules occurs in old age, and may begin as early as thirty-five years. The interstitial tissue between the seminiferous tubules is believed to have an endocrinal function and to influence the development of secondary sex trails and the vigor of the individual. Also associated with the testes are certain rudimentary organs (ductuli aberrantes, paradidymis, hydatid of Morgagni) the significance of which will be better understood after the description of their develop- men
. Chordate anatomy. Chordata; Anatomy, Comparative. THE UROGENITAL SYSTEM 313 ous tubules. Diminution in the activity of the tubules occurs in old age, and may begin as early as thirty-five years. The interstitial tissue between the seminiferous tubules is believed to have an endocrinal function and to influence the development of secondary sex trails and the vigor of the individual. Also associated with the testes are certain rudimentary organs (ductuli aberrantes, paradidymis, hydatid of Morgagni) the significance of which will be better understood after the description of their develop- ment. Each testis is attached to the scrotum by a connective-tissue cord, the gubernaculum. SPERMATIC- CORD. PUBIC SYMPHYSIS CORPUS CAVERNOSUM urogenital "Diaphragm, •bulbourethral GLAND. BULBUS. --/-RECTUM EXTERNAL -SPHINCTER MUSCLE. •ANUS. Fig. 278.—The male urogenital system. The glandular complications of the male urogenital system appear to be in part an adaptation to the double function of the urethra—excretory and reproductive. The alkaline secretions of the glands serve to neutralize the acidity of the urethra caused by the acid urine. (Sobotta.) Ductus Deferens. By the efferent ducts of the testis, sperm is carried to the ductus epididymidis, a much convoluted tube twenty or more feet in length, which together with the efferent ducts forms the head of the epididymis. The ductus epididymidis is the beginning of the ductus deferens and, like it, Hned with ciliated columnar epitheHum. The ciUa beat towards the urethra and carry the spermatozoa to the seminal vesicles where they may be temporarily stored. Layers of circular and longitudinal muscles are present in the wall of the duct. At the lower end of the testis the ductus loops back along the tail or Cauda of the epididymis, and then leaves the epididymis to join the spermatic cord. As a component of the spermatic cord it passes through the inguinal canal. Entering the body cavity, the ductus leaves t
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