TheMaleReproductiveSystem.ppt

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1、The Male Reproductive System Mader Chapter 15.1The male urogenital systemThe urogenital tractlThe beginning:Testesproduce sperm and interstitial cells produce male sex hormones.Seminiferous tubulesproduce sperm.(packed with cells undergoing spermatogenesis)Epididymisstores sperm while they mature.15

2、-3The male urogenital systemThe urogenital tract-Cont.Seminal vesiclesproduce a sugary alkaline fluid which buffers the sperm against acids in the female reproductive tract.Prostate glandcontributes a milky alkaline fluid to semen.Bulbourethral glandssecrete a slippery alkaline fluid which lubricate

3、s the urethral canal.Vas deferenstransport sperm to the urethra.3.5 ml of ejaculate may contain as many as 400 million sperm which live about 48 hours in the female reproductive tract.15-5The urogenital tract-Cont.Seminal vesiclesproduce a sugary alkaline fluid which buffers the sperm against acids

4、in the female reproductive tract.Prostate glandcontributes a milky alkaline fluid to semen.Bulbourethral glandssecrete a slippery alkaline fluid which lubricates the urethral canal.Vas deferenstransport sperm to the urethra.3.5 ml of ejaculate may contain as many as 400 million sperm which live abou

5、t 48 hours in the female reproductive tract.15-5The testis-in detailSeminiferous tubulesSpermatozoonThe male gamete-spermatozoon Sperm(spermatozoa)lAcrosomestores enzymes needed to penetrate the egg.lHeadcontains the nucleus with 23 chromosomes.lMidpiecemitochondria provide energy for movement.lTail

6、flagellum for movement.15-7The male pituitary gonad axisReleasing hormoneNegative feedbackThe male pituitary gonad axisReleasing hormoneNegative feedbackThe male gonad-pituitary axislHormonal Regulation in Males:Follicle-stimulating hormone(FSH)promotes the production of sperm.Luteinizing hormone(LH)controls the production of testosterone.Testosteroneessential for normal development and functioning of the male reproductive organs.15-8