Chapter 18 Male Reproductive System
Chapter 18 Male Reproductive System
1. Components testis produce the male germ cells-gametes(sperm produce androgen-testosterone --gernital ducts: store and conduct the sperm epididymis ductus deferens ejaculatory duct accessory gland: their secretion join into semen seminal vesicle prostate bulbourethral gland ●pens
1. Components: ---testis: produce the male germ cells- gametes(sperm) produce androgen-testosterone ---gernital ducts: store and conduct the sperm epididymis ductus deferens ejaculatory duct ---accessory gland: their secretion join into semen seminal vesicle prostate bulbourethral gland penis
2 Testis 输出小管 睾丸网 生精小管 1)General structure 精小管 鞘膜脏层 ① Capsule 销膜腔 附睾管 a. tunica vaginalis vIsceral layer-serosa b tunica albuginea: thick, DCT /mediastinum testis: albuginea became thicker at posterior aspect /septum thin septa extend radiately from mediastinum testis to divided the parenchyma into lobule
2. Testis 1) General structure: ① Capsule: a. tunica vaginalis: visceral layer-serosa b. tunica albuginea: thick, DCT /mediastinum testis: albuginea became thicker at posterior aspect /septum: thin septa extend radiately from mediastinum testis to divided the parenchyma into lobule
② Lobule a. seminiferous tubule /highly coiled /30-70cm|ong,150-250 mm in d /begin as free blind end -run to posterior become into straight tubule(tubules rectus) enter mediastinum testis→rete testis→ efferent duct→→ connect With epididymal duct b. testicular interstitial tissue: lct between seminiferous tubule
② Lobule a. seminiferous tubule: /highly coiled /30-70cm long, 150-250 mm in D /begin as free blind end →run to posterior →become into straight tubule(tubules rectus) →enter mediastinum testis→rete testis→efferent duct→connect with epididymal duct b. testicular interstitial tissue: LCT between seminiferous tubule
是骨 辨 间赎细 路" 数女初级母细想 M原细胞 ∷公精子朝慰 2)Seminiferous tubule: /30-70cm\long,150 250um in d specific stratified epithelium: spermatogenic epi ( seminiferous epi) e spermatogenic cells e Sertoli or supporting cell e myoid cell: under basal lamina
2) Seminiferous tubule: 30-70cm long, 150- 250um in D ---specific stratified epithelium: spermatogenic epi.(seminiferous epi) spermatogenic cells Sertoli or supporting cell myoid cell: under basal lamina
① Spermatogenic cell 5-8 layers c 4 types of cells
① Spermatogenic cell: ---5-8 layers ---4 types of cells
a spermatogonium outerest layer, one layer structure round, ellipsoid ce‖ /12um round N, deep stained
a. spermatogonium ---outerest layer, one layer ---structure: /round, ellipsoid cell /12um /round N, deep stained
classification ● type A dark type A(Ad): ovoid, deep-stained N, stem cell Pale type A(Ap): ovoid, pale-stained N differentiate into type B e type B: round N, chromatin granules are distributed under nucleus membrane division and differentiate into primary spermatocyte
---classification: type A: -dark type A(Ad): ovoid, deep-stained N, stem cell -Pale type A(Ap): ovoid, pale-stained N, differentiate into type B type B: round N, chromatin granules are distributed under nucleus membrane, division and differentiate into primary spermatocyte
b primary spermatocytes ---diploid (2n)cell duplicate dNA tetraploid cell(4n) division structure e round cell, become largest, 18 um, left the basal layer N: large, round, on different stage of division (the prophase of meiotic division up to 22 days) through first meiosis divides into two secondary spermatocyte(2n, 23X or 23Y)
b. primary spermatocytes ---diploid(2n)cell →duplicate DNA → tetraploid cell(4n) →division ---structure: round cell, become largest, 18 um, left the basal layer N: large, round, on different stage of division(the prophase of meiotic division up to 22 days) ---through first meiosis divides into two secondary spermatocyte(2n, 23X or 23Y)
C secondary spermatocyte nearer the lumen structure e round cell, 12um o N: round deep-stained hard to see-short lived(divide quickly) through secondary meiosis divides into two spermatid (1n, 23X or 23Y)
c. secondary spermatocyte: ---nearer the lumen ---structure: round cell, 12um N: round deep-stained hard to see- short lived(divide quickly) ---through secondary meiosis divides into two spermatid(1n, 23X or 23Y)
