QUESTIONS AND ANSWERS 263 



It is covered by a serous coat except at the hilus. Underneath 

 this coat is a strong fibrous coat and beneath this coat is the ovarian 

 tissue proper. The latter is hard and grayish-red and is divided 

 into ah external cortical and an internal medullary portion. The 

 cortex is made up of connective tissue and holds large numbers of 

 Graafian vesicles or ovisacs which contain the ova. The medulla 

 is red and spongy and is composed of connective tissue which is 

 richly supplied with blood-vessels. The ovary receives its blood 

 from the utero-ovarian artery and is innervated by a branch from 

 the mesenteric plexus. 



State how the ovaries of the mare differ from those of (a) the cow, (b) 

 the sheep, (c) the goat, (d) the pig, (e) the bitch, (f) the cat. 



(a) Much smaller than in the mare, but are identical in form 

 and structure. See answer to preceding question. 



(b) and (c) Same remark applies here as given in (a). 



(d) The ovary is lobulated in the pig. 



(e) and (f ) Slightly lobulated in aspect. 



Describe the mammary gland. 



The mammary gland consists of two glandular bodies situated in 

 the posterior and inferior abdominal region. They are hemispherical 

 in shape and terminate below in a small prominence, the teat. Ex- 

 ternally, they are covered with skin, beneath which is a fibrous coat 

 which sends prolongations into the interior of the gland. The 

 glandular tissue contains acini which open into lactiferous ducts. 

 These ducts unite and form canals which, in turn, form two, three 

 or four sinuses that open by several canals on the teat. The external 

 pudie artery supplies the gland with blood and innervation is 

 received from the first pair of lumbar nerves. 



Describe the mammary glands of the bitch. 



These are ten in number, arranged in two rows of five each, 

 and extend from the inguinal region to below the chest. They have 

 no galactiferous reservoirs and the lactiferous ducts unite directly 

 into a variable number of canals that pass through the teat to pierce 

 its extremity by from five to ten orifices. 



Describe the vesiculae seminales and give their function. 



The vesiculae seminales are two oval pouches, situated above 

 the neck of the bladder, and having a body and an anterior and 

 posterior extremity. The latter is tapering and unites with the vas 

 deferens to form the ejaculatory duct. The anterior extremity forms 

 a rounded cul-de-sac partially covered with peritoneum. The walls 



