Chap 17 ppts - Male reproductive system fig 17-6 1 Testis...

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1 Male reproductive system fig 17-6
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2 fig 17-5
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3 Spermatogenesis fig 17-7
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4 Structure of seminiferous tubules fig 17-4
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5 Spermatogenesis fig 17-9
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6 Spermatogenesis (notes) Spermatogenesis begins at puberty Spermatogonia primary spermatocytes mitotic division, occurring in basal compartment primary spermatocytes cross tight junction to adluminal compartment Primary spermatocyte secondary spermatocytes first meiotic division, occurring in adluminal compartment Secondary spermatocyte spermatids second meiotic division, adluminal compartment Spermatids spermatozoa no division, maturation process
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7 Sertoli cell (functions) 1. 2. nourish developing sperm 3. 4. 5. secrete inhibin which inhibits release of FSH 6. absorb & destroy defective sperm
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8 Structure of spermatozoon fig 17-8 Acrosome: contains enzymes involved in fertilization process
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9 fig 17-10
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10 Erection: stimuli from CNS systems, penile mechanoreceptors parasympathetic nerves (nonadrenergic noncholinergic) release NO NO stimulates soluble guanylate cyclase in penile arteriole smooth muscle Emission: (movement of seminal fluid into prostatic urethra) sympathetic NS peristaltic contractions of vas deferens Ejaculation: semen entering prostatic urethra spinal reflex involving somatic NS & skeletal muscle of perineal floor
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11 Male hormonal control fig 17-11
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12 GnRH, LH, FSH (notes) Gonadotropin releasing hormone (GnRH) secreted by hypothalamus into hypothalamo-hypophyseal portal system increases at puberty, ? less sensitivity to testosterone feedback pulsatile release ~90 min Luteinizing hormone (LH) from anterior pituitary, stimulated by GnRH, inhibited by testosterone acts on Leydig cells of testis →↑ testosterone release Follicle stimulating hormone (FSH) from anterior pituitary, stimulated by GnRH, inhibited by inhibin acts with testosterone on Sertoli cells to promote spermatogenesis Note: LH & FSH are produced by the same anterior pituitary cell
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13 Testosterone (notes) Source release stimulated by LH Actions stimulates spermatogenesis (in conjunction with FSH) stimulates differentiation of male genitalia (in utero) stimulates development of male 2 ° sexual characteristics at puberty
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Chap 17 ppts - Male reproductive system fig 17-6 1 Testis...

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