40 



ANATOMY OF THE RABBIT 



(5) The digestive system comprises the digestive tube and its 

 outstanding glandular appendages — the oral glands, the liver, and 

 the pancreas. 



(6) The respiratory system comprises the lungs, and respira- 

 tory passages, namely, the bronchi, the trachea, and the larynx. 

 \Mlh this system may also be included the accessory respiratory 

 passages formed by the nasal fossae. 



(7) The vascular system comprises the organs of circulation 

 of the blood and the lymphatic system. The former are the heart, 

 the arteries, the capillary vessels, and the veins; the latter the 

 lymph-conducting canals, which, though they ultimately empty 

 into the veins and do not constitute an independent circulatory 

 path, are sometimes considered as forming with their associated 

 lymph glands a separate lymphatic system. 



(8) The urinogenital system includes the reproductive and 

 excretory organs, together with their common ducts — the urethra 

 of the male and the vestibulum of the female — and the associated 

 bulbourethral gland. The reproductive organs comprise, in the 

 male, the central organs or testes, and the deferent ducts, both 



of which are paired, the unpaired 

 seminal vesicle, and the paired 

 prostatic and paraprostatic glands. 

 In the female, the reproductive 

 organs comprise the paired ovaries, 

 uterine tubes, and uteri, together 

 with the unpaired vagina. The 

 excretory organs of both sexes 

 comprise the paired kidneys and 

 ureters and the unpaired urinary 

 bladder. 



Only included in part, or 

 omitted in this classification are 

 certain organs which physiologi- 

 cally at least may be grouped 

 together because they have general 

 regulatory and growth-controlling 

 They constitute the internal secreting, hormone, or 



Fig. 21. Rabbit-embryo of 10»/2 days 

 (4.8 mm.): m., manibular; h., hyoid; 1 

 and 2, first and second branchial arches; 

 a.l., anterior Hmb-bud; me., nietameres; 

 p.l., posterior limb-bud. (After Minot 

 and Tavlor, in Keibels Normentafeln, V; 

 Fig. 12.) 



functions. 



