chapter26b Reproduction and Development 2

chapter26b Reproduction and Development 2 - Chapter 26b...

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Unformatted text preview: Chapter 26b Reproduction and Development Male Reproductive Structures External genitalia Penis and scrotum Common passageway Urethra Accessory glands and ducts Prostate gland Seminal vesicle Bulbourethral gland Figure 26-8 (1 of 2) Male Reproductive Structures - Overview Figure 26-8 (2 of 2) Male Reproductive Structures - Erectile Tissues Male Reproductive Structures Testes (sperm production) Seminiferous tubules Epididymis (sperm maturation) Vas deferens ( aka ductus deferens, a passageway into abdomen and delivery to the urethra) Figure 26-9a Male Reproductive Structures - Sagittal View Urethra Scrotum Testis Rectum Ureter Urinary bladder Prostate gland Ejaculatory duct Bulbourethral gland Vas deferens Pubic symphysis Epididymis Seminal vesicle Penis (a) ANATOMY SUMMARY THE MALE REPRODUCTIVE SYSTEM Figure 26-9b Male Reproductive Structures - Scrotal Structures Head of epididymis Seminiferous tubule Vas deferens Epididymis Scrotal cavity (b) ANATOMY SUMMARY THE MALE REPRODUCTIVE SYSTEM Figure 26-9c Seminiferous Tubule - Cross-Section Spermatogonium Capillary Leydig cell (c) Sertoli cell ANATOMY SUMMARY THE MALE REPRODUCTIVE SYSTEM Spermatogenesis in the Testes Seminiferous tubules Sertoli cells surround and support developing sperm Spermatogonia divide and produce all sperm cells Primary and secondary spermatocytes Spermatids Spermatozoa Interstitial tissues support spermatogenesis Leydig cells testosterone Capillaries deliver nutrients and remove wastes Figure 26-9d Seminiferous Tubule - Detail Sertoli cells Spermatozoa Spermatids Secondary spermatocyte Primary spermatocyte Spermatogonium Leydig cells Capillary Fibroblast Basal lamina Lumen of seminiferous tubule (d) Tight junction between Sertoli cells ANATOMY SUMMARY THE MALE REPRODUCTIVE SYSTEM Figure 26-10 Spermatozoa Structure Tail (flagellum) Mid piece Head Microtubules Mitochondrial spiral Centrioles Nucleus Acrosome contains enzymes Regulation of Spermatogenesis Hormones control the production of sperm GnRH stimulates the release of LH and FSH LH Leydig cells testosterone FSH Sertoli cells cell products Figure 26-11 Regulation of Spermatogenesis LH GnRH Hypothalamus Anterior pituitary Inhibin Testes Leydig cells Testosterone (T) To body for secondary effects FSH Sertoli cell Cell products Second messenger Sertoli cell ABP T Androgen-binding protein (ABP) Spermatogonium Spermatocyte Accessory Glands Contribute to Semen Accessory glands contribute 99% of semen volume, as well as the following Seminal vesicles fructose, vitamin C, prostaglandins Prostate gland buffers, citric acid, enzymes Bulbourethral gland mucus, buffers Table 26-3 Accessory Glands Contribute to Semen Female Reproductive System...
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chapter26b Reproduction and Development 2 - Chapter 26b...

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