190 EQUINE ANATOMY. 



penis nniscle ; and an anterior extremity forming a 

 blunt point, surrounded by the spongy tissue of the 

 glands. It is attached by the two crura and the two 

 suspensory ligaments. Structure : erectile tissue, com- 

 posed externally of white, elastic, fibrous envelope, 

 sending by its inner face numbers of lamellar trabecu- 

 Ise. The blood vessels are the dorsal arteries of the 

 penis. Nerves from the internal pudic and great sym- 

 pathetic. 



Penis. — Male organ of copulation. Extending 

 from the ischial arch between the thighs and the two 

 dartoid sacs, beneath the belly, where it terminates. 

 Divided into a fixed and a free portion, which is cov- 

 ered by the cutaneous fold of the skin, the sheath or 

 prepuce. The free portion at its anterior extremity 

 presents the urethral tube, the urethral sinus and the 

 sub-urethral notch. The penis has two suspensory 

 and retractile cords, composed of unstriped muscular 

 fibres, which draw it back into the sheath after erec- 

 tion. The sheath contains a large number of sebace- 

 ous or preputial glands, secreting an unctuous fatty 

 matter, the smegma preputii. 



Genital organs of the female — ovaries, fallopi- 

 an TUBES, UTERUS, VAGINA, VULVA. — (Scc abdominal 

 and pelvic cavities, page 163.) 



Mamm^. — Situated in the inguinal region, they 



