PSYCH 230 1st Edition Lecture 8 Outline of Last Lecture I. Internal Sexual OrgansII. The BreastsIII. Female PubertyIV. MenstruationOutline of Current Lecture Male Sexual Anatomy and PhysiologyI. External Sex Organs II. The PenisIII. Penis Size and Male AnxietyIV. The Glans PenisV. The Root to the Penis VI. ErectionVII. The ScrotumCurrent LectureI. External Sex Organs a. Boys are typically more comfortable with their genitalia than girls - Testes are visible (ovaries are internal)- Penis is typically held during urinationb. Penisc. ScrotumII. The Penis a. Contains urethra for urine and semen transportb. Becomes erect to penetrate vagina and deposit sperm near the osc. No bone, little muscle, blood vessels, spongy tissues d. Composed of 3 cylinders of erectile connective tissue so that it looks like 1 cylinder of erectile tissue that are bound together with connective tissue so that it looks like 1 cylinder - Corpora cavernosa (2) upper side - Corpus spongiosum (contains the urethra) central III. Penis Size and Male Anxiety These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. The average flaccid penis is between male 3-4 inches longb. The average erect penis is 6 inches c. 15% of men have an erect penis measuring over 7 in. d. Fewer than 5,000 erect penises worldwide measure 12in. e. Largely dependent on heredity f. Pornography skews ideas about average sexual satisfaction for females unrelated g. Danger of enhancement products IV. The Glans Penis a. The cone like end of the penis made up of:- Corona: Ridge of the glans penis - Frenulum: Fold of skin on the underside of the penis - Meatus: Urethral opening at the opening of the penis b. Sensitive to stimulation c. Foreskin - fold of skin that can cover part of all of the glans; retracts over the corona during an erection d. Circumcision- surgical removal of the foreskin; most common male surgery in theU.S. - Religious/ cultural ritual- Health reasons- Medical value is questionable V. The Root of the Penis a. Extends into the body below the pubic bone b. Attached to internal pelvic muscles and can be felt in the perineum VI. Erectiona. Any type of stimulation perceived as sexual can cause an erection; spinal reflexb. Can also occur during REM, possible to keep the penis supplied with bloodc. Nerve fibers open the arteries of the penis to allow blood to flow into the 3 cylinders d. Veins compress to prevent exit of bloode. Flaccid state returns when arteries constrict and the veins open to allow blood toflow out VII. The Scrotum a. Loose wrinkled pouch beneath the penis containing the testicles b. Lightly covered with pubic hairc. Functions to keep the testicles 3 degrees Celsius cooler then the bodies temperature to keep sperm viable - Contains sweat glands - Cremaster muscle moves the scrotum closer to or farther from the body
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