. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. valve tlie tree border of which—directed down- wards—covers a cul-de-sac from about three- fourths to one inch deep. The structure of the urethra is also dif- ereut. The walls of tlie m'mhranous portion are thicker than in the Hort^e ; they have a layer of erectile tissue, and a sphincter muscle, very thick below and laterally, the fibres of which are inserted in the middle of the upper surface, into an aponeurotic raphe. At the ischial arch, when the canal bends downwards, the spongy tissue becomes more abundan
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. valve tlie tree border of which—directed down- wards—covers a cul-de-sac from about three- fourths to one inch deep. The structure of the urethra is also dif- ereut. The walls of tlie m'mhranous portion are thicker than in the Hort^e ; they have a layer of erectile tissue, and a sphincter muscle, very thick below and laterally, the fibres of which are inserted in the middle of the upper surface, into an aponeurotic raphe. At the ischial arch, when the canal bends downwards, the spongy tissue becomes more abundant to form the hidh of tlie urethra ; but the prominence at this point is chiefly due to the accelerator urinas, as is shown in Fig. 526, C 4. This muscle is extremely powerful, but it soon ceases beneath the ischial arch. The transversus perinxi is as strong as in Solipeds. Glands annexed to the urethra.—Coirper's glands are absent. The prostate gland is not voluminous, and forms, at the commencement of the urethra, a little transverse yellow, bilo- bate mats, beneath which pass the vasa deferentia; it also lies beneatli the sphincter muscle, and is prolonged for some distance on the membranous portion of the urethra. Ptnis.—In the Bull, the penis is long and thin, and carried well forward beneath the belly. It is enclosed at the perinaeum in an aponeurotic sheath, which is covered by the ischio-tibial muscles. This sheath is double, its superficial layer being continuous with the dartos, and it has the same physical cha- racters; the deep layer is thin, white, and inelastic. In front of the pubis, the penis describes two ^ive curves—the S of the penis—the first witli its convexity forsvards, the second backwards. It is at the second curve that the suspensory ligaments join the penis, and continue along its aides to its extremity. The free poi tion of the organ—very taper- ing—is covered by a fine, itapillated, very sensitive, rose-coloured nmcous membra
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Keywords: ., bookauthorcha, bookcentury1900, bookdecade1900, booksubjecthorses
