ANATOMY. 



25 



masses, distinct from each other, and having in their 

 centre the teat, nipple, or mammillee. They are 

 composed of a yellow elastic fibrous envelope, glandular 

 tissue made up of acini, clustered in groups around the 

 lactiferous ducts, which by their union open into the 

 galactophorous sinuses, from which arise the true 

 excretory canals of the glands. 



Fig. 12. 

 Section of Udder of Cow. 

 a, Anterior Quarter; b. Posterior Quarter; g. Septum between the Quarters',- 

 c, c. Section of the Lactiferous Ducts; d, d. Lactiferous Sinus or Milk 

 Cistern; e, e, Orifice of the Teat; / Large Lymph Gland in the Posterior 

 Quarter. 



In the Cow the mammse are also inguinal, and are- 

 composed of two symmetrical halves placed one against 

 the other. Each half is again divided*into two distinct 

 glands, each with its own teat, so that the vessel 

 consists of four mammae and four teats ; behind this 

 there may be two small rudimentary teats. In the 

 centre of each quarter, just at the base of the teat, is a 

 large galactophorous sinus, the general receptacle of 

 all the lactiferous conduits. 



