MaleAnatLect07A - Male Reproductive Anatomy Understand the...

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Male Reproductive Anatomy Understand the Structure and Function of: 1. Testes 2. Excurrent Duct System (including epididymis) 3. Spermatic Cord/Scrotum 4. Accessory Sex Glands 5. Penis Should have read Chapter 3, 4 (89-94) and 10 (218-239) (for Monday, Chapter 11) In-Class Quiz on Monday (includes reading for Monday)
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Steps in Sperm Production Manufacturing Finishing Warehousing and Shipping Final Alteration and Packaging Delivery System
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Male Gonads Testis-singular Testes-plural Function in: Gametogenesis- specifically spermatogenesis Produce male steroids (androgens like testosterone) and protein hormones (inhibin) Produce fluid to move sperm through ducts
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Diversity in Male Tracts Elephants Dolphins, Whales Sloths, Anteaters Hedgehog Mole, Shrew, Some Bats Pigs, Horses, Rabbits , Rats, Dogs, Cats Sheep, Cattle, Other Ruminants -Position of Testes Differs (often extracorporeal) -Some species lack some accessory glands -Appearance/size differs
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Spermatic Cord Extends from the body through the inguinal canal to each testis Pathway for nerves, blood and lymph vessels, vas deferens (ductus deferens) Contains cremaster muscle and pampiniform plexus
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Pampiniform Plexus Heat exchanger Warm Incoming Blood is Cooled by Outgoing Blood Spermatogenesis occurs only at temp 2-10 ° C below body temp
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Testicular Artery is surrounded by Testicular Venous Plexus
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Other Cooling Adaptations of Scrotum Scrotum-a 2-lobed sac with several layers 1. skin-many sweat glands, little hair, little subcutaneous fat 2. Scrotal skin has temp sensors that increase respiration
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Inside Skin is Tunica Dartos Muscle- Temp Regulation Layer of smooth muscle (involuntary) just underneath scrotal skin When cold-contracted which warms testis When warm-relaxed which increases surface area and cools testis Inside Tunica Dartos is Parietal tunica vaginalis-pocket from peritoneum
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Problems Relating to Testicular Temp Cryptorchidism (bilateral and unilateral) bilateral cryptorchids are infertile, normal testoterone In many non-seasonal breeders, there is a decrease in fertility in warm months “Short scrotumed” bulls Physicians suggest that men with fertility problems wear boxer shorts Varicocele in testis
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This test prep was uploaded on 04/09/2008 for the course ANSC 331 taught by Professor Kestler during the Spring '08 term at University of Illinois at Urbana–Champaign.

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MaleAnatLect07A - Male Reproductive Anatomy Understand the...

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