SCI 106 Male Reproductive System OK

SCI 106 Male Reproductive System OK - Male Urethra...

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Male Reproductive  System
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11-1 Spermatic Cord and Inguinal Canal
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11-4 Seminiferous Tubules
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Male Hormones FSH = Follicle Stimulating Hormone Increases sperm production LH = Leutinizing Hormone Increases testosterone secretion
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Spermatogenesis Sperm produced continuously (puberty – old age) Hundreds of millions every day Occurs in seminiferous tubules Takes 65 – 75 days to form in tubules Sperm go to epididymis to mature: 3 – 4 weeks Stored here until ejaculation
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11-5
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11-6
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12-1 Three Sets of Glands
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Glands Two Seminal Vesicles : thick, clear fluid lubricates and nourishes sperm Prostate gland: milky, alkaline fluid protects sperm from vaginal acidity Two Cowpers glands few drops of fluid (pre-ejaculate) during arousal lubricates urethra lubricates vagina
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12-2
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12-3 Internal Structures of the Penis
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12-6 Stages of Ejaculation
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Ejaculation 1. Filling Phase -peak of arousal -contractions force secretions into vas deferens -sphincter at base of bladder contracts -sphincter at base of penis contracts -prostatic urethra fills with semen and expands
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Unformatted text preview: Male Urethra Prostatic Urethra Diaphragmatic Urethra Ejaculation 2. Expulsion Phase-sphincter at base of penis relaxes-strong muscular contractions-semen expelled through penis 12-8 Parts of a sperm cell Fertilization Oocyte viable for ~ 1 day after ovulation Sperm viable for up to 5 days after ejacultaion Therefore, for fertilization, coitus must be no more than 5 days before ovulation and no later than 1 day after. Facts 24 hours after ovulation oocyte is 1/3 the way down the uterine tube 3 4 days after ovulation, if fertilization occurs, the zygote reaches uterus 7 days after ovulation, implantation begins The Human Sexual Response Female mammals : Estrus : specific mating time when female is at peak of sexual readiness uterus primed for implantation Humans and other primates: no distinct mating periods females receptive to males throughout the year The Human Sexual Response Four Phases: 1. Excitement 2. Plateau 3. Orgasm 4. Resolution...
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This note was uploaded on 03/30/2008 for the course SCI 106 taught by Professor Abdirkin during the Fall '07 term at St. Thomas FL.

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SCI 106 Male Reproductive System OK - Male Urethra...

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