Biology · Ch 2 — Reproduction in Lower and Higher Animals

Permanent Methods

b. Permanent Method : The permanent birth-control methods are vasectomy in men and tubectomy in women; both are surgical methods, also called sterilisation, and unlike temporary methods they are not intended to be reversed. In vasectomy, a small part of each vas deferens — the duct that normally carries sperm from the epididymis onward towards the urethra — is tied and cut, so sperm can no longer reach the ejaculate even though the testis continues producing them. In tubectomy, a small part of each fallopian tube is tied and cut, so the ovulated egg can no longer travel down to meet sperm, and sperm arriving from the male partner cannot reach the egg either. In both procedures, it is this blocking of gamete transport that prevents ferti …

Figure 2.22Permanent method: A - vasectomy, with a small part of the vas deferens tied and cut in the male, and B - tubectomy, with a small part of the fallopian tubes tied and cut in the female

Fig. 2.22 — Permanent method: A - vasectomy, with a small part of the vas deferens tied and cut in the male, and B - tubectomy, with a small part of the fallopian tubes tied and cut in the female

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What this figure shows. The two surgical sterilisation methods of the textbook's Fig. 2.22: A, vasectomy, in which a small part of each vas deferens is tied and cut, and B, tubectomy, in which a small part of each fallopian tube is tied and cut, so that gamet …

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