Biology of Reproduction Summers

Endocrinology Homeostasis/Feedback Adult Female Steroid Production Ovulation

Adult Male Gonadal Axis Regulation Sexual Differentiation Sexual Behavior Puberty

Reproductive Cycling Estrous Cycles Menstrual Cycle Menopause Fertilization

Fertilization Systems Gamete Interaction Pregnancy Labor and Parturition Lactation

Sexual Response & Behavior Pheromones STDs text: Human Reproductive Biology4th Edition- RE Jones & KH Lopez,: pp 24-28 Acronyms/Abbreviations    end

X. Adult Male 			

 	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