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.
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.