Presentation on theme: "Ch 27: Reproductive System"— Presentation transcript:
1 Ch 27: Reproductive System General organizationAnatomy of male reproductive systemAnatomy of female reproductive system
2 General Organization Gonads gametes & hormones Ducts transport of ?Glands secrete fluidPerineal structures = external genitalia
3 Anatomy of Male Repro System Primary reproductive organs produce gametesSecondary reproductive organsMale reproductive and urinary tracts are partially sharedFig 27-1
4 Testes (paired glands) Develop adjacent to kidneysDescend into scrotum through inguinal canalPeritoneal lining is carried along lining of scrotumCryptorchidism (in 3% of full-term and 30% of premature deliveries)Significance?Treatment?4 monthFig 27-2
5 Scrotum Function: supports and protects testes Structure: Skin & underlying superficial fasciaDartos muscle in subcutisCremaster muscle deep to dermis (continuation of ___________)Involuntary contraction (cremasteric reflex) in response to ________Scrotal sac forms separate chambersCremaster muscle
6 Structure of Testes Two tissue layers cover testes: 200-300 lobules Tunica albugineaTunica vaginalislobules3 seminiferous tubulesFig 27-4/5
7 From Spermatocyte to Spermatozoon Spermatogenesis: Meiosis of primary spermatocytes spermatidsSpermiogenesis: Spermatid maturation into spermatozoa within Sertoli cellsSpermiation: Spermatozoon released into lumen
8 Sustentacular (Sertoli) Cells Maintenance of blood testis barrierspecial lumen fluidsperm specific agSupport of spermatogenesisFSH and Testosterone work via Sertoli cellsSupport of spermiogenesisSecretion of inhibinSecretion of androgen-binding protein (ABP)
9 Anatomy of Spermatozoon Mature sperm has 3 portionsHead with acrosomeMidpiece with lots of ?Flagellum (rotating in corkscrew fashion)See fig 27-6
10 Epididymis Functions: Sperm-maturation ~ 7 m longSperm-maturationRecycling of damaged spermatozoaAdjusting composition of tubular fluid (stereocilia!!)Functions:
11 Path of Spermatozoa from tail of epididymis: ductus (vas) deferensampullaejaculatory ducturethra
12 Capacitation Activation of spermatozoa Occurs after spermatozoa leave epididymis and come in contact with seminal fluid Seminal fluid + Sperm = SemenFinal capacitation when exposed to conditions inside female reproductive tract
13 The Accessory Glands. Seminal vesicles Prostate gland Provide for 95% of the seminal fluidSeminal vesiclesProstate glandBulbourethral glands
14 Seminal Vesicles Produce 60% of seminal fluid Tubular glands (~ 15 cm) Secretionis rich in fructoseleads to sperm motility
15 Prostate Gland 25% of seminal fluid Single, doughnut-shaped Secretion contains:citrateseminal plasminprostate specific antigen (PSA)
16 Bulbourethral glands (Cowper’s glands) Pea sizeAlkaline secretion containing lots of mucus. function??
17 Erectile Tissue Penis has 3 cylindrical columns: One corpus spongiosum Two corpora cavernosaCorporacavernosaCorpusspongiosum??
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