APPENDIX. 191 



form two hemisplierical masses, distinct from each 

 other and having in their centre the teat, nipple or 

 mammillge. Structm'c : composed of a yellow elastic 

 fibrous envelope ; tliey consist of a glandular tissue 

 made of acini, clustered in groups around the lactifer- 

 ous ducts, which, by their union, open in the galacte- 

 forous sinuses, from which rise the true excretory 

 canals of the glands. Much connective tissue unite 

 these acini. The arteries of the mammse come from 

 tlie external pudic ; the nerves from the first lumbar 

 nerve. Their function is to secrete the milk. 



