Presentation on theme: "Male Reproductive System"— Presentation transcript:
1 Male Reproductive System Nestor T. Hilvano, M.D., M.P.H.
2 Learning ObjectivesDescribe the components of the male reproductive system and state their functions.Describe the anatomy of the testes, scrotum, and penis.Explain the roles played by the male reproductive tract and accessory glands in maturation, nourishment, storage and transport of spermatozoa.Outline the process of spermatogenesis and describe the role of sertoli cells.Describe a sperm cell and trace the pathway taken by a sperm cell from its formation to its ejaculation.State the normal composition of semen.Discuss the hormonal control that regulate male reproductive functions.Discuss BPH and prostatic cancer.
3 Components and Functions of Male Reproductive System _______ – produce gametes and hormones- testes_______ - receive and transmit gametes- epididymis, ejaculatory duct, urethra_______ - secrete fluids- seminal vesicles, prostate gland, bulbo-urehtral glands_______ - perineal structures- scrotum, penisa. genital ducts b. accessory glands c. gonads d. external genitalia
4 Testes Male gonads, found in pouch called the scrotal sac. Descent of testes (2 to 7 months)- Gubernaculum testis (C.T.) shortens- Essential for ________What is cryptorchidism?
5 Spermatic Cord Extend bet. Abdominopelvic cavity and testes Consist of layers of fascia and muscleWhat structures are contained in spermatic cord?Pass through inguinal canal, descend into scrotum_______ - protrusion of visceral tissues into inguinal canala. femoral hernia b. hiatal hernia c. inguinale hernia d. all
6 Testes Tunica vaginalis Tunica albuginea Septa divide testes into compartments containing seminiferous tubulesSperm cellsSustentacular (nurse/sertoli) cellsInterstitial (Leydig) cells produce _____.Estrogen b. Testosteronec. FSH d. LH
7 SpermatogenesisSpermatogenesis- differentiation from spermatogonium to spermatozoas (sperm cells)Stages of spermatogenesis:Mitosis = Spermatogonia - type A produce more daughter cells (type A); some forms type BGrowth = type B differentiate into primary spermatocytesMeiosis- MI primary spermatocytes to secondary spermatocytes- MII secondary spermatocytes to spermatids4. Spermiogenesis= transformation of spermatids tospermatozoas (sperm cells)
8 Spermatic Ducts Efferent ductules Epididymis (head, body and tail) collecting sperm from semineferous tubulesEpididymis (head, body and tail)coiled duct adhering to posterior of testisFunction _____________Ductus deferensmuscular tube 45 cm longEjaculatory ductformed from union of _____________ and duct of _____________.
9 Male Urethra ___Prostatic ___Membranous ___Penile Middle and shortest segmentTraverses the corpus spongiosum; longest segmentFirst segment
10 Accessory Glands Seminal vesicles posterior to bladder Secretion ___________Prostate glandbelow bladder, surrounds urethra and ejaculatory ductBulbourethral glandsnear bulb of penis; lubricating fluidMucus and alkaline b. acid phosphatasec. Fructose d. lactose
11 Penis Root, shaft, and glans skin over shaft loosely attached prepuce (foreskin)3 cylindrical bodies of erectile tissuecorpus spongiosumencloses ____________corpora cavernosa
12 Hormonal Control Hypothalamus produces GnRH Stimulates anterior pituitary to secreteLHstimulates interstitial cells to produce testosteroneFSHstimulates sustentacular cells to secrete androgen-binding protein that interacts with testosterone to stimulate spermatogenesis
13 Effects of Testosterone Enlargement of secondary sexual organsDuring adulthood, testosterone sustains libido, spermatogenesis and reproductive tract
14 Semen or Seminal Fluid 2-5 mL of fluid Other components of semen 60% seminal vesicle fluid, 30% prostaticnormal sperm count million/mLOther components of semenfructose - energy for sperm motilityfibrinolysin liquefies semen within 30 minutesprostaglandins stimulate female peristaltic contractionsspermine is a base stabilizing sperm pH at 7.2 to 7.6
15 Excitement and Ejaculation Erection of penis- parasympathetic triggering of nitric oxidesecretionEjaculation- sympathetic nervous system propelssperm through ductsResolution- sympathetic signals constrict internalpudendal artery and reduce blood flow topenis
16 Homework (Self-Review) Define terms: spermatogenesis, dartos muscle, cremasteric muscle, vasectomy, spermiogenesis, ejaculatory duct, inguinale hernia, & cryptorchidism.Trace the pathway of sperm from its formation to ejaculation.Give function(s) of the following: sertoli cell, testosterone, testes, epididymis, seminal vesicle, prostate gland, cowper’s gland, vas deferens, & male urethra.Describe the spermatic cord.