Seminal vesicles Seminal vesicles - are paired glands, whose secret provide sperm with nutrients, and support their mobility (diagram 113). Prostate

Prostate, penis and seminal vesicles

Seminal vesicles

Seminal vesicles — are paired glands, whose secret provide sperm with nutrients, and support their mobility (diagram 113).

Prostate

The prostate gland (prostate) is an unpaired organ, which is located below the bladder and covers the upper part of the urethra (diagrams 113, 116). It produces the slightly alkaline secret and the biologically active substances that mix with sperm. Passing through the vas deferens, prostate secret neutralizes the acidic environment in the urethra and stimulates sperm motility. The urethra is also the way which is used for excretion of urine from the bladder and of sperm. The muscles of the prostate pinch the urethra while contracting, so mixing urine with sperm does not occur. Contraction of prostate muscles also provides a process of ejaculation. Taken from http://worldofschool.org

Diagram 113. The structure of the male reproductive organs: 1 — the penis; 2 — the urethra; 3 — cavernosum; 4 — the spongy body; 5 — a bunch; 6 — testicle; 7 — convoluted seminiferous tubules testicular; 8 — the head of the penis; 9 — epididymis; 10 — scrotum; 11 — the ureter; 12 — the vas deferens; 13 — the seminal vesicle; 14 — rectum; 15 — bladder; 16 — the coccyx; 17 — ejaculatory ducts; 18 — the prostate gland; 19 — pubic symphysis
Diagram 116. The movement of sperm: 1 — the vas deferens; 2 — testicle; 3 — the seminal vesicles; 4 — the urethra; 5 — bladder; 6 — the prostate gland; 7 — epididymis

Penis

The penis is used to excrete urine and sperm, it takes part in coitus. It consists of a body and a head (balanus) formed by spongy cavernous bodies (diagram 113). During sexual arousal, due to the features of the blood vessels structure, blood under the pressure fills the corpora cavernosa that causes an erection (from the Latin “straightening”).

Balanus is covered with skin fold — foreskin. Sebaceous glands enter inside and continuously secrete smegma (from the Latin. “oil”). In case of violation of hygiene rules smegma decomposes, and developing microorganisms in it lead to inflammation of the penis head. Cases of fusion of the foreskin to the head are sometimes observed. In this case it is necessary to consult a doctor-urologist. For some people who profess a certain religion (Judaism, Islam), since ancient times there is a rite of circumcision.

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Questions:
  • Explain the anatomy and functions of the vas deferens and seminal vesicles.

  • Why the prostate gland does is considered a very important organ?