CHFD 3010 Chapter 4

CHFD 3010 Chapter 4 - Chapter4 MaleSexualAnatomy...

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Click to edit Master subtitle style Male Sexual Anatomy & Physiology Chapter 4
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Penis : male sexual organ consisting of the internal  root and the external shaft and glans Nerves, blood vessels, fibrous tissue, and 3 parallel  cylinders of spongy tissue NO bone or muscular tissue, there ARE muscles at the  base of the penis that help eject urine & semen Sexual Anatomy
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Root : the portion of the penis that extends internally into  the pelvic cavity Shaft:  the length of the penis between the glans and the  body (excluding the head) Glans:  the smooth, acorn shaped head Corona:  hypersensitive rim of the penile glans Parts of the Penis
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The Penis
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The Penis Cavernous bodies:  the two larger structures  in the shaft of the penis  that engorge with blood  during sexual arousal Spongy body:  the smaller cylinder that  forms a bulb at the base  of the penis, extends up  into the penile shaft, and  forms the penile glans Foreskin: The loose covering of skin  over the penile glans that is  often removed by  circumcision
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http://www.youtube.com/ The underside of an  uncircumcised penis Male Genital Modification
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Scrotum : loose pouch of skin of the external male  genitals that encloses the testes Outermost layer: covering of thin skin that is darker in  color than other body skin that becomes sparsely  covered with hair during puberty Tunica dartos: the second layer of smooth muscle fibers  and fibrous connective tissue Testis/Testicle  (pl. testes): male gonad inside the  scrotum that produces sperm and sex hormones Spermatic Cord:  attached to the testis that  contains the vas deferens, blood vessels, nerves,  The Scrotum
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Underlying Scrotum Structures
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Two major functions: 1. Secretion of sex hormones 2. Production of sperm Optimum at slightly lower temperature than body  temperature (5-6 degrees cooler than regular body temp of  98.6, thus testes away from body Cryptorchidism:  a condition in which the testes  fail to descend from the abdominal cavity to the  scrotal sac . 3-5% of male infants affected (if not occurred by 6  months, spontaneous descent not likely) The Testes
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Seminiferous tubules:  thin, coiled structures in the  testes in which sperm are produced Interstitial cells:  (Leydig’s cells) cells located  between the seminiferous tubules that are the major  source of androgen in males Epididymis:  the structure along the back of each  testis in which sperm maturation occurs Sperm “storage chamber” for several weeks Sperm Production & Storage
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