Biology of Reproduction Summers

text: Human Reproductive Biology2nd Edition - Richard E. Jones & Kristin H. Lopez,: Read pages 97-121 for this lecture acronyms    end

X. Adult Male 			back to IX. Ovulation & Meiosis

 	A. Reproductive Anatomy


		1. Testes


			a. Seminiferous tubules


				i. where spermatogenesis &
				   spermiogenesis take place


				ii. coiled loops


			b. Lobule


				i. 250/testis;
				   1-3 closed coiled loops/lobule


			c. Tubulus Rectus


			d. Rete Testis


			e.Vasa Efferentia


		2. Epididymis


			a. Site of Sperm Storage


			b. Head 


			c. Body


			d. Tail


				i. Ductus Epididymis


		3. Vas Deferens


			a. transport of ejaculate


	B. Seminiferous Tubule Function


		1. Interstitium


			a. Leydig Cells


				i. synthesize steroid hormones (D5(similar))


					(1) Major: Testosterone (T)


					(2) Other: Androstenedione, DHEA,
					      5a-DHT (5a-Dihydrotestosterone)


						(a) also very small amounts of estradiol


				ii. homologous to theca


			b. blood vessels & connective tissue


		2. Seminiferous Epithelium


			a. Spermatogonia produced throughout life


				i. 2N, mitosis


			b. 1o Spermatocytes (2N)


				i. Meiosis I


			c. 2o Spermatocytes (N)


				i. Meiosis II


			d. Spermatid (N)


			e. Spermatozoa


				i. Sertoli Cells


					(1) provide nutrients for spermatozoa,
					    secrete ABP (androgen binding protein),
					    phagocytosis of degenerated germ cells


					(2) produce testicular fluid ® into lumen


					(3) homologous to granulosa cells


		3. Spermatogenesis: a ® d


			a. making of spermatogonia ® spermatids


		4. Spermiogenesis: d ® e


			a. spermatid to spermatozoa


		5. Spermiation


			a. sperm being released from sertoli cell into lumen