PSYC 3070 1st Edition Lecture 9 Current LectureMale Sexual AnatomyPenis: primary male sex organ Penile Shaft: long part of penis – smooth spongy tissue- When aroused, the spongy tissue of shaft fills with blood and produces an erection (Tumescence)Penile glands: a sexually sensitive area at the very top of the penis that contains numerous nerve endingsCorona: the rounded area at the base  most sensitive part of penisScrotum- Scrotal sac – layer of skin, surrounds the testicles – features sweat glands and hair follicles - Cremaster muscle: helps maintain an ideal temperature- Functions of scrotal sac: Protects testes, blood vessels, and part of spermatic cordTestes/Testicles: male gonads, produce sex hormones (testosterone) and reproductive cells (sperm)Seminiferous Tubules: tightly coiled tubular structure in the capsule tunica albuginea - Where sperm is produced (spermatogenesis)EpididymisVas deferens – carry sperm from epididymis to ejaculatory ducts to be releasedSeminal vesicles – a pair of tubular glands that produce seminal fluid (constitutes the majority of semen 70-75%)Prostate Gland – produces prostatic secretions (20-25% of semen)Cowper’s (Bolbourethral Gland) – clears out urethra and lubricates before ejaculationErection and EjaculationThese 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.2 Stages of Ejaculation:1. Emission Phase – semen prepared for secretion2. Expulsion Phase – rhythmic contractions force semen out of bodya. One ejaculation contains a max of 500 million sperm cells!Post- Ejaculation- Detumescence: penis becomes soft & loses erection- Refractory period – time post-ejaculation during which sexual stimulation will not lead to an erectiono In young men, lasts about an houro In older men, can last a few hours to a whole day!!Size- Flaccid penis – unaroused, soft, limp peniso 3 inches long on averageo Does not predict erection length- An erect penis averages 5 to 6 incheso For heterosexual intercourse, 4 inches is usually big enough to stimulate erogenous tissue in a woman’s vagina- Circumcision – a surgical procedure removing foreskinPhysiology Testosterone – a steroid hormone from the androgen group secreted by the testes, ovaries, and adrenal glands – primary sex hormoneFunctions:1. Helps organize male reproduction2. Secondary sex characteristics3. Impacts sexual functioning in both genders4. Plays a key role in sex drive in males and females (higher levels = greater sex drive)5. Plays a key role in genital sensitivity (more = more sensitive)- Cons: aggressive behavior + risk takingAndropause – a process similar to menopause occurring in some menProduces: - Decreased testosterone levels- Decreased sex drive- Reduced depth of sensation in genitals - Can lead to erectile disfunctionDifferences between andropause and menopause Males can still reproduce (still fertile)Side effects/symptoms:- Mood swings, muscle mass loss, decreased bone density, fewer spontaneous erections, harder to get aroused and stay aroused, more sensitive (emotionally) changes in sleep