THE UROGENITAL SYSTEM 



311 



muscles are divided into circular and longitudinal layers of smooth fibers. 

 Near its orifice the bulbo-cavernosus muscle acts as a sphincter. 



External Genitals. The external genital organs in the female form 

 a median longitudinal groove extending from the mons pubis in front 

 nearly to the anus behind. This groove is bordered by two fleshy folds, 

 the labia majora, which contain considerable fatty tissue, and which are 

 somewhat beset with hairs both on their inner and outer surfaces. Usu- 

 ally, the median edges of the labia majora are in contact with one another, 

 thus concealing the remaining parts of the external genitals. Sebaceous 

 and sweat glands are numerous on the median surfaces. (Fig. 276) 



lENITAL 

 DIAPHRAGM. 



Fig. 276. — The urogenital system — female. (Sobotta.) 



Between and more or less concealed by the labia majora is a second 

 pair of integumentary folds, the labia minora, which are devoid of fat 

 and of hairs. The space between the two labia minora is the vestibule, 

 at the ventral end of which projects an erectile organ, the clitoris. Both 

 urethra and vagina open into the vestibule. On the sides of the vestibule, 

 are the openings of the greater vestibular glands or glands of BarthoHn, 

 which correspond with the bulbo-urethral glands of the male. 



B, 2. Reproductive Organs: Male 



Testes. The male reproductive glands are lodged in an integumentary 

 pouch, the scrotum, which is divided by a median septum into two com- 

 partments. This septum develops through the union of two fleshy folds 



