ANSC 3080 Lecture Notes - Lecture 18: Centriole, Sister Chromatids, Mycoplasma
9 Nov 2016
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Testes need to be kept 4-6 c below temperature for spermatogenesis. During late part of gestation or early life: testicular descent via inguinal canal is required. Later in life: temperature controlled by the veins of the pampliform plexus (in the spermatic cord) forming a countercurrent heat exchanger. On the inside of the scrotum: layers of connective tissue (scrotal fascia and parietal vaginal tunic) Covering the testes is a layer of vascularized connective tissue (tunica albuginae + visceral vaginal tunic) that projects septa in the testis. Smooth muscle cover the septa (helping moving immature sperms) Ducts collect sperm to rate testis in the center= tubes that bring sperm to the epididymis. Interstitium (between st): composed of connective tissue, nerve, blood vessels and. Testis structure similar to bull- more pronounced interstitial (leydig cells produce wider array of antigens c16, c19 steroids (16 androstenes) + estrogens) Testis location reduces ef ciency of heat exchange. Zygotene: pairing of homologues (forming a tetrad)
