. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE MALE GENITAL ORGANS. 859 Fis;. 401. head of the epididymis or globus major. The posterior, the tail of the epidi- dymis, or globus minor, is more detached from the testicle, and is curved upwards to be ct)utinued by the deferent canal (vas deferens). Structure.—The epididymis is constituted by a long duct doubled a great number of times on itself, and whose convolutions, after injection with mercury, can be very readily seen through the serous membrane. This duct results from the union of from twelve to twenty small
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE MALE GENITAL ORGANS. 859 Fis;. 401. head of the epididymis or globus major. The posterior, the tail of the epidi- dymis, or globus minor, is more detached from the testicle, and is curved upwards to be ct)utinued by the deferent canal (vas deferens). Structure.—The epididymis is constituted by a long duct doubled a great number of times on itself, and whose convolutions, after injection with mercury, can be very readily seen through the serous membrane. This duct results from the union of from twelve to twenty small tubes, the efferent ducts, v,']iich, arising from the rete testis, open together, at a variable distance, into the globus major. Towards the globus minor there is only one duct, which is more voluminous and less flexuous, and finishes by becoming detached from the posterior lobe of the epididymis to constitute the vas deferens. The organisation of the walls of these ducts is not the same throughout. Thus, in the efferent ducts, it comprises a simple ciliated epithelium, resting on a proper amorphous membrane, which again is placed on unstripcd circular fibres attached to a thin fibrous tunic; u hile beyond, there is observed a stratified ciliated epithelium, a proper membrane, two layers of unstriped fibres—circular and longitudinal—and also a fibrous tunic. The thickness of the muscular layers increases from before to behind. The epididymis receives its arteries and nerves from the same sources as the testicle. Deferent Canal (vas deferens).—This duct is about the thickness of a goose-quill, and is at first flexuous, then straight. It lies parallel with, but behind and to the inner side of, the spermatic vessels, as far as the opening of the tunica vaginalis; passing through this opening, it enters the pelvic cavity, and crosses obliquely the ureter and obliterated cord of the umbilical artery. It is then inflected backwards, placed above the bladder, suddenly dilates
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