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CHAPTER 22: THE REPRODUCTIVE SYSTEMS

IV.Male Reproductive Organs (continued)

H.Penis: See Fig 22.15, page 893.

1.male excitatory organ;

2.specialized to become erect for insertion into vagina during sexual intercourse;

3.cylindrical body composed of three columns of erectile tissue.

4.completely surrounds urethra.

5.Structure:

a. pair of dorsally located corpora cavernosa;

b.single corpus spongiosum which extends at its distal end to form the enlarged glans penis;

c.Each column is surrounded by a tough capsule of white fibrous CT called tunica albuginea;

d. A loose fold of skin called the prepuce covers the glans as a sheath.

The prepuce is sometimes removed by a surgical procedure called a circumcision;

*    Erection =vascular spaces within erectile tissue become engorged with blood when male becomes sexually stimulated.

See Fig 22.16, page 893.

*    Emission = movement of semen from epididymis into urethra.

*    Ejaculation  = forceful movement of semen from urethra to outside.

See Fig 22.17, page 896.

*    Orgasm=culmination of sexual stimulation accompanied by involuntary rhythmic contractions of the epididymis causing emission and ejaculation of semen, resulting in a sense of psychological and physiological release.

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