Lecture on Male Reproductive System and Related Anatomy

Opening Remarks

• Importance of filling out evaluations for feedback.
• Reminder for students to submit evaluations at the end of class.

Male Reproductive System

Penis Anatomy

• Cross-section:
  • Three cavernous bodies:
    • Two Corpora Cavernosa.
    • One Corpora Cavernosa Urethra with urethra internally.
  • Parasympathetic stimulation leads to blood filling cavernous bodies, resulting in erection by blocking venous flow.

Gland Secretions

• Seminal Vesicles:
  • Secrete fructose to nourish sperm.
  • Contribute 60% of semen volume.
• Prostate Gland:
  • Secretion activates sperm.
  • Contributes 15-30% of semen volume.
• Bulbo Urethral Glands:
  • Peanut-sized; neutralize acid in urethra.

Ejaculation

• Volume: 2.5 to 6 cc per ejaculation.
• Sperm Count: 200 million per ejaculation.
• Sterility: Defined as less than 20 million sperm per ejaculation.

Review Session Notes

Kidney and Nephron

• Kidneys located between T12 to L3.
• Nephron structure includes distal convoluted tubule.
• Glomerular Filtration:
  • 1200 cc of blood produces 125 cc glomerular filtrate per minute.
  • 124 cc reabsorbed; 1 cc urine formed.
• Hormones:
  • Anti-diuretic hormone affects collecting ducts.
  • Juxtaglomerular apparatus secretes renin.

Anatomy of the Ear

• External Ear:
  • Auditory meatus lined by stratified squamous epithelium.
• Middle Ear:
  • Tympanic membrane composed of connective tissue, stratified squamous epithelium, and mucous membrane.
• Inner Ear:
  • Organ of Corti is the receptor for hearing.

Various Anatomy and Physiology Points

Digestive System

• Stomach:
  • Mucus cells protect against HCl produced by parietal cells.
  • Chief cells produce pepsinogen.
• Small Intestine:
  • Brunner's glands in duodenum secrete alkaline mucus.

Female Reproductive System

• Uterus:
  • Thickest at fundus, thinnest at cervix.
  • Pap smears take tissue from cervix.
• Vagina:
  • Lined with stratified squamous epithelium.
  • Does not produce its own secretions.

Miscellaneous

• Sperm Viability and Vasectomy:
  • Sperm live for three days.
  • Easiest vasectomy approach through scrotum.

Closing Remarks

• Encouragement to remember lecture content by teaching others.
• Reminder to submit evaluations in boxes by the doors.