THE MAMMAKY GLANDS 437 



minora contain no adipose tissue. They are richly supplied with 

 blood vessels. 



The labia majora are formed by similar folds whose inner sur- 

 face resembles the adjacent portion of the labia minora, but whose 

 outer surface is cutaneous and is supplied with sebaceous and 

 sudoriparous glands and with numerous hair follicles. The sub- 

 epithelial areolar tissue is very dense and its deeper portion con- 

 tains much fat. 



The clitoris consists of a mass of erectile tissue, homologous 

 with the corpora cavernosa and glans penis of the male ; it is 

 covered by a fold of the mucosa. It is well supplied with nerves, 

 which terminate in tactile corpuscles, end bulbs, and genital cor- 

 puscles. In this vicinity also, as well as in the region of the labia, 

 Pacinian corpuscles are occasionally found. 



The hymen is formed by a reduplication of the vestibular mu- 

 cosa. Its inner surface is similar to that of the labia minora and 

 vagina ; its outer is like that of the cutaneous surface, except that 

 it contains no hair follicles. 



The glandulae vestibulares minor es are a group of small mucus 

 secreting glands, similar in structure to the glands of Littre in the 

 male, which occur in the vestibular mucosa in the vicinity of the 

 meat us urethrae. 



The glandulae vestibulares majores (glands of BartJiolin) form 

 a paired tubulo-alveolar mucus secreting gland which opens by a 

 narrow duct into the groove between the hymen and labium minus. 

 The tubular alveoli are lined by columnar mucus secreting cells ; 

 the ducts are clothed with columnar epithelium, which, as they 

 approach their termination, becomes double-rowed, and finally 

 changes to a stratified squamous epithelium similar to that of 

 the surface upon which they open. These ducts frequently pre- 

 sent saccular dilatations. 



THE MAMMAEY GLANDS 



From a strictly histogenic standpoint the mammary glands 

 should be considered as appendages of the skin, and as such should 

 more properly have been considered in the chapter devoted to that 

 subject. Yet these glands are so closely related to the reproductive 

 functions, attaining their full development only in the lactating 

 female, that it seems equally proper^to consider them at this time 

 as accessory reproductive organs. 



Each mammary gland consists of fifteen to twenty -four (Kolli- 



