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Ch 27: Reproductive System

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1 Ch 27: Reproductive System
General organization Anatomy of male reproductive system Anatomy of female reproductive system

2 General Organization Gonads gametes & hormones
Ducts transport of ? Glands secrete fluid Perineal structures = external genitalia

3 Anatomy of Male Repro System
Primary reproductive organs produce gametes Secondary reproductive organs Male reproductive and urinary tracts are partially shared Fig 27-1

4 Testes (paired glands)
Develop adjacent to kidneys Descend into scrotum through inguinal canal Peritoneal lining is carried along  lining of scrotum Cryptorchidism (in 3% of full-term and 30% of premature deliveries) Significance? Treatment? 4 month Fig 27-2

5 Scrotum Function: supports and protects testes
Structure: Skin & underlying superficial fascia Dartos muscle in subcutis Cremaster muscle deep to dermis (continuation of ___________) Involuntary contraction (cremasteric reflex) in response to ________ Scrotal sac forms separate chambers Cremaster muscle

6 Structure of Testes Two tissue layers cover testes: 200-300 lobules
Tunica albuginea Tunica vaginalis lobules 3 seminiferous tubules Fig 27-4/5

7 From Spermatocyte to Spermatozoon
Spermatogenesis: Meiosis of primary spermatocytes  spermatids Spermiogenesis: Spermatid maturation into spermatozoa within Sertoli cells Spermiation: Spermatozoon released into lumen

8 Sustentacular (Sertoli) Cells
Maintenance of blood testis barrier special lumen fluid sperm specific ag Support of spermatogenesis FSH and Testosterone work via Sertoli cells Support of spermiogenesis Secretion of inhibin Secretion of androgen-binding protein (ABP)

9 Anatomy of Spermatozoon
Mature sperm has 3 portions Head with acrosome Midpiece with lots of ? Flagellum (rotating in corkscrew fashion) See fig 27-6

10 Epididymis Functions: Sperm-maturation
~ 7 m long Sperm-maturation Recycling of damaged spermatozoa Adjusting composition of tubular fluid (stereocilia!!) Functions:

11 Path of Spermatozoa from tail of epididymis:
ductus (vas) deferens ampulla ejaculatory duct urethra

12 Capacitation Activation of spermatozoa
Occurs after spermatozoa leave epididymis and come in contact with seminal fluid Seminal fluid + Sperm = Semen Final capacitation when exposed to conditions inside female reproductive tract

13 The Accessory Glands. Seminal vesicles Prostate gland
Provide for 95% of the seminal fluid Seminal vesicles Prostate gland Bulbourethral glands

14 Seminal Vesicles Produce 60% of seminal fluid Tubular glands (~ 15 cm)
Secretion is rich in fructose leads to sperm motility

15 Prostate Gland 25% of seminal fluid Single, doughnut-shaped
Secretion contains: citrate seminal plasmin prostate specific antigen (PSA)

16 Bulbourethral glands (Cowper’s glands)
Pea size Alkaline secretion containing lots of mucus. function??

17 Erectile Tissue Penis has 3 cylindrical columns: One corpus spongiosum
Two corpora cavernosa Corpora cavernosa Corpus spongiosum ??

18 the end


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