. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 248 MAMMARY GLANDS. We must next direct our attention to the internal structure of the breast, first as regards the protective arrangements. The fascia enveloping the breast, like the tunica albuginea of the testicle, sends in pro- cesses to support and protect the secreting membrane of the gland and suspend it in its situation. These processes are all denomi- nated by Sir Astley the ligamenta suspensoria, (Jig. 73). " The ends of these ligaments are spread out and incorporated with the posterior surface of the skin
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 248 MAMMARY GLANDS. We must next direct our attention to the internal structure of the breast, first as regards the protective arrangements. The fascia enveloping the breast, like the tunica albuginea of the testicle, sends in pro- cesses to support and protect the secreting membrane of the gland and suspend it in its situation. These processes are all denomi- nated by Sir Astley the ligamenta suspensoria, (Jig. 73). " The ends of these ligaments are spread out and incorporated with the posterior surface of the skin, and give it whiteness and ; The secerning portion of the gland con- sists of the minute cells which were referred to at the commencement of this article, and we learn from Sir A. Cooper that " their size in full lactation is that of a hole pricked in paper by the point of a very fine pin; so that the cellules, when distended with quicksilver or milk, are just visible to the naked eye. (Fig. 74.) They are rather oval than round, Fig. 74. Shews the origin of the ducts from the milk celh, (injected with quicksilver and magnified four times.). being slightly elongated where the bunch of the lactiferous tubes springs from them; but they appear more rounded to quicksilver, and when distended with milk than when filled with ; These minute cells or cellules are bound up together so compactly as to form little bodies or " glandules" varying in size from a pin's head to that of a small tare. When separated from the rest of the gland but attached to the mammary duct, which originates in separate branches from its cellules, it presents a race- mose appearance. From the cellules the milk-tubes originate in a radiate form by small and numerous branches. They increase in size by repeated unions, and terminate by five or six branches in dilatations— the " reservoirs7' of Sir Astley. " These recep- tacles are of a conical form (see Jig. 75) l
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