. Kirkes' handbook of physiology . atory duct; the vas deferens has been divided near i, and all except the vesical portionhas been taken away; s, left vesicula seminalis joining the same duct; s,s, the right vas deferensand right vesicula seminalis. which has been unraveled; p, under side ot the prostate gland; »»,part of the urethra; u, u, the ureters (cut short), the right one turned aside. (Haller.) 682 THE REPRODUCTIVE ORGANS in remarkably firm fibrous sheaths. Two, the corpora cavernosa, are alikeand are firmly joined together. They receive below and between them thethird part, or corpus
. Kirkes' handbook of physiology . atory duct; the vas deferens has been divided near i, and all except the vesical portionhas been taken away; s, left vesicula seminalis joining the same duct; s,s, the right vas deferensand right vesicula seminalis. which has been unraveled; p, under side ot the prostate gland; »»,part of the urethra; u, u, the ureters (cut short), the right one turned aside. (Haller.) 682 THE REPRODUCTIVE ORGANS in remarkably firm fibrous sheaths. Two, the corpora cavernosa, are alikeand are firmly joined together. They receive below and between them thethird part, or corpus spongiosum. The urethra passes through the corpusspongiosum. The enlarged extremity, or glans penis, is continuous with thecorpus spongiosum. Cowperi glands are at its base, and their ducts openinto the base of the urethra. The Prostate Gland. The prostate is .situated at the neck of theurinary bladder, ami encloses the base of the urethra. The prostate is madeup of small compound tubular glands embedded in an abundance of mus-. Fig. 4qi.—Human Spermatozoa (after Retzius). A, Side view; B, front view. cular fibers and connective tissue. The glandular substance consists ofnumerous small saccules, opening into elongated ducts, which unite into asmaller number of excretory ducts. The acini of the upper part of the prostateare small and hemispherical, in the middle and lower parts the tubes arelonger and more convoluted. The ducts, twelve to twenty in number, openinto the urethra. They are lined by a layer of columnar cells, beneath whichis a layer of small polyhedral cells. The muscular tissue of the prostate not only forms the chief part of thestroma of the gland, but also forms a continuous layer inside the fibrous sheath,as well as a layer surrounding the urethra continuous with the sphincter ofthe bladder. The Seminal Fluid. The sperm cells of the testes are joined on theirway to the exterior by the fluids secreted by the mucous lining of the varioustubules and glands. Of
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