Male Reproductive System
- Created by: Saoirse
- Created on: 09-10-14 11:52
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- Male Reproductive system
- Initiating an erection
- Parasympathetic fibres from the sacral portion of the spinal cord initiate and maintain erection
- Release and stimulate the local production of Nitric Oxide (NO) - vasodilator
- NO relaxes smooth muscle of arterioles in erectile tissue
- Widening/relaxation of blood vessel = increased blood flow = erection
- Parasympathetic fibres from the sacral portion of the spinal cord initiate and maintain erection
- Anatomy
- Spermatic cord
- Muscle enclosing ductus deferens, blood vessels, nerves and lymphatic vessels supplying each of the testes
- Cremaster and dartos muscles
- Allow accent/descent of the testes
- Rafe
- Raised thickening of the scrotum externally dividing two testes
- Internal scrotal septum
- Testes
- Septa subdivide testes into lobules
- Each lobule contains 1-3 semiferous tubules
- Site of spermatogenesis
- Spermatogenic cells = sperm forming cells
- Sertoli cells = support spermatogenesis
- Inbetween tubules are blood vessels and interstitial cells that produce androgens
- Each lobule contains 1-3 semiferous tubules
- Septa subdivide testes into lobules
- Spermatic cord
- Spermatogenesis
- Spermatozoa (mature gamete) formation
- 4 distinct regions
- Head = densely packed chromosomes and acrosome contains enzymes essential for fertiilisation
- Neck = contains centrioles and original spermatid
- Middle piece = mitochondria
- Tail = flagellum; whip like corkscrew motion
- Lacks many organelles - reduces size and mass increasing mobility and speed
- 4 distinct regions
- Begins at puberty
- Involves Mitosis, Meiosis and Spermiogenesis
- Occurs in seminiferous tubules
- Begins in outermost layer (immature) and proceeds towards lumen (maturer)
- Spermatogonia
- Develop from primordial germ cells during 5th week of development
- Spermiogenesis
- formation of acrosomem development of flagella and multiplication of mitochondria
- Sperm are haploid
- Unable to swim and incapable of fertilisation
- Spermatozoa (mature gamete) formation
- Nurse (sertoli) cells
- Essential role in nurturing and providing structural support for the sperm during development
- Roles
- Phagocytosis of degenerated germ cells
- Untitled
- Initiating an erection
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