250 SPECIAL ANATOMY. 



Chorion, yelk membrane, is single, indivisible (a zona pellucida, that is to 

 say, a space filled with fluid between the yelk and the menibrana granulosa 

 does not exist). The yelk contains a thick mass of whitish yellow, brilliant 

 granules and globules, the size of which equals the fat globules. Surrounded 

 by, and close beneath the Chorion, lies the 



Germinal, or vesicle of Purkinje, vesicula germinativa. It is round, clear as 

 water, and so much the larger the smaller the egg, consists of a smooth, struc- 

 tureless membrane, and contains, besides, a very clear albuminous fluid, a 

 dark granule, the germinal spot (macula germinativa). 



Vessels of the Ovary. Arter. : ovarica branches of the uterina. Veins and 

 lymphatics like the arteries. 



Nerves: plex. spermat. intern, from sympathicus. 



485. 2. The Fallopian tubes, tubse Fallopise, two membra- 

 nous tubes, four inches long, lying transversely between the 

 Uterus and the external wall of the pelvic entrance (one upon 

 etiher side), before and above the ovary, behind the round liga- 

 ment. The external extremity, extremitas abdominalis, consists 

 of thin, extensible walls, curves backwards and inwards towards 

 the external extremity of the ovary, and opens with an orifice a 

 line wide into the abdominal cavity, surrounded by fringed lobules, 

 fimbrise latinise s. morsus diaboli. One of these lobules (the 

 innermost) is connected by means of a ligament with the Ovarium, 

 which it surrounds like a funnel, in consequence of the flow of 

 blood to it after conception. The inner extremity, extrem. ute- 

 rina, is firm, and not extensible, and opens into the cavity of the 

 Uterus at the superior angle with a very narrow orifice (one fourth 

 of a line) obliquely inwards and downwards. A (narrow) canal 

 consequently leads from the cavity of the Uterus directly into 

 the cavity of the abdomen. 



Structure. The tuba consists of three coats: a. The serous coat (perito- 

 neum) ; a continuation of the lig. uteri latum passes to the external orifice, 

 where it also passes on to the fringe and over into the mucous membrane 

 (the only instance of such a transition) ; the peritoneum is likewise open at 

 this point. 



b. The central, very vascular coat, a continuation of the tissue of the 

 Uterus, contains, in the larger animals at least, muscular fibres ; the internal 

 fibres pass longitudinally ; the external transversely. 



c. The innermost coat, mucous membrane, presents, especially at the ex- 

 ternal extremity, many longitudinal folds, rugse longitudinal., and passes into 

 the tunica serosa. Arteries ; from the uterina and spermat. interna. Veins ; in 

 the plex. pampiniform. and v. uterina. 



Function : a. The conveyance of the male semen to the ovary 

 (?). b. The reception and conveyance of the ovum from the 

 ovary into the Uterus. 



486. 3. The Womb, Uterus, 



a pear-shaped bag, flattened from before to behind ; its broadest 

 closed extremity directed upwards, its narrow open extremity 



