ZOO 3000 Lecture Notes - Lecture 21: Ejaculation, Steroid, Spermatid
27 Jul 2018
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Testes: endocrine role steroidogenesis, exocrine role gametogenesis, ducts, conduct sperm and modify fluids. Exocrine glands: nourish sperm and provide medium for transport. Seminal vesicles: paired gland with fibrous coat surrounding highly folded tubular mucosa. Smooth muscle contracts during ejaculation: produces seminal fluids, fructose-rich secretion for spermatozoa nourishment, alkaline secretion helps neutralize acidity of vaginal tract. Fibromuscular stroma contracts during ejaculation: glandular epithelium generally columnar and pseudostratified. Secretion is alkaline and contains enzymes that liquefies the semen. Loose connective tissue stroma: 1-4 seminiferous tubules highly convoluted tubes in which sperm are produced. Tubules end near mediastinum, where they become rete testis. Function fluid reabsorption and sperm concentration: leydig cells. Shape polygonal: nucleus central, cytoplasm eosinophilic with lipid vacuoles. Function synthesize testosterone from cholesterol in elaborate ser: seminiferous tubules. Sertoli cells targets of fsh and testosterone. Spermatogenic cells: myoid cells found in the lamina propria (i. e. peritubular contractile cells capable of peristaltic movement) This blood-testis barrier isolates spermatogenic cells from immune system.
