THE GENITO-URINARY APPARATUS. 281 



Its epithelium is squamous, and its glands racemose, mucous, 

 and sebaceous glands or glandulce odoriferi Tysoni. 



The Bartholine or suburethral glands are two racemose 

 glands about one-third inch in diameter, situated just behind the 

 semibulbs of the spongy body. The ducts, about three-fourths 

 inch long, open between the nymphae and the vaginal orifice, or 

 the hymen, if present. They secrete mucous. 



The blood-vessels and nerves of the vulva correspond to those 

 of the penis and scrotum (vide Internal Pudic Artery). 



MAMMARY GLAND. 



The mamma?, or breasts, are the milk-secreting organs of 

 the female (being rudimentary in the male). They consist 

 of two large, hemispherical bodies, in the antero-lateral region of 

 the thorax, resting upon the pectoralis major muscle, between 

 the third and seventh ribs, inclosed between the two layers of 

 the superficial fascia. 



The nipple (mammilla) is roseate or brownish, and sur- 

 rounded by an areola of the same color, the skin of which con- 

 tains numerous sebaceous glands, the tubercles of the areola, 

 or the glands of Montgomery. The skin of the nipple is thin, 

 vascular, and erectile. On its summit are the orifices of the 

 fifteen to twenty milk-ducts, or lactiferous ducts. 



Its structure is firm and pinkish-white, consisting of fifteen 

 or twenty lobes forming a racemose gland, held together and 

 invested with fibrous tissue. 



Each lobe ends in one of the tubuli lactiferi, or galactophori, 

 which beneath the areola dilates into a lactiferous sinus, or 

 galactophorous sinus, or ampulla, and terminates on the summit 

 of nipple in an orifice. 



The arteries are, the long thoracic, with other branches of 

 the axillary, the internal mammary, and intercostals. 



The veins follow the corresponding arteries to end in the 

 internal mammary and axillary veins. They form about the 

 base of the nipple a venous circular anastomosis, the drculus 

 venosus. 



The lymphatics terminate in the axillary glands, a few also 

 entering the anterior mediastinal glands. 



The nerves are from the anterior and lateral cutaneous 

 branches of the intercostals. 



Milk, the secretion of the mammary gland, is an emulsion, 

 consisting of a colorless fluid, the milk-plasma, holding in sus- 

 pension the milk- globules. It has a specific gravity of 1.028 to 

 1.034, and slightly alkaline reaction. 



