. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 38o DISCOVERY REPORTS not by pulling upon the pelvic bone, but by compressing the proximal end of the corpus cavernosum and so driving the blood forward towards the terminal cone. The muscle will also have the effect to a less extent of squeezing the corpus spongiosum and urethra, driving the seminal fluid forwards during the orgasm. Yves Delage (1885, p. 131), however, was of opinion that the envelope of the corpus cavernosum was too thick to allow compression by the ischio-cavernosus muscle. H
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 38o DISCOVERY REPORTS not by pulling upon the pelvic bone, but by compressing the proximal end of the corpus cavernosum and so driving the blood forward towards the terminal cone. The muscle will also have the effect to a less extent of squeezing the corpus spongiosum and urethra, driving the seminal fluid forwards during the orgasm. Yves Delage (1885, p. 131), however, was of opinion that the envelope of the corpus cavernosum was too thick to allow compression by the ischio-cavernosus muscle. He believed that the ischio-cavernosus acted by dragging the penis backwards, or, through the independent action of the muscles of one side, by pulling the penis to one side or the other during the act of copulation. However, the ischiac attachment is almost certainly too small for such an action as this. The immense mass of muscle confined almost entirely to the face of the corpus cavernosum can only have a compressor action. The bulbo-cavernosus muscle lies between the arms of the cavernous crura (Figs. 1 /10, 2 i, 3 i) immediately ventral and posterior to the "transverse ligament", with the fibres of which the deeper fasciculi of the muscle intermingle. The bulbo-cavernosus is overlaid in ventral view by the two retractores penis and posteriorly abuts upon the levator ani. The fasciculi arise from the inner ventral surfaces of the posterior portions of the arms of the crura and are inserted, after a short inward and backward course, upon a median fibrous raphe. The muscle must act by approximating the two arms of the crura, thus assisting in the erection of the penis. ^ft^^. The prostata The part of the urethra extending from the termination of the corpus spongiosum at the base of the bulbus penis forward to the verumontanum, where the vasa deferentia join the urinary canal, has been named the prostate portion of the urethra (Fig. 3/). In the foetus, 1-23111. in len
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