第一次成熟分裂前期 初级精母细胞 +-①((k 细线期 同源染色(朵色体纵裂)(染色体交叉)(阿源朵色 (in DNA) 体配对 体分离) 次级精母细胞 精子细构 中期后期 第二次成熟分裂 NA Q兴 23,X成23,Y 3X23,Y (In !NA) 高尔基复合体 顶体 顶体泡 顶体泡 细胞核 粒体 细胞质 鞭毛 心 残余胞质
d spermatid structure g smallest cell 8um e located at inerest layer --through spermiogenesis: spermatid become into spermatozoa
d. spermatid ---structure: smallest cell, 8um located at innerest layer ---through spermiogenesis: spermatid become into spermatozoa
e spermatozoa structure of spermatozoa: ●60 um length ●head:- pear-shaped -flattened nucleus acrosome .tail: flagellum(centriole neck -middle segment mitochondria sheath -principal segment end segment
e. spermatozoa: ---structure of spermatozoa: 60 um length head: -pear-shaped -flattened -nucleus -acrosome tail: flagallum (centriole) -neck -middle segment: mitochondria sheath -principal segment -end segment
the processes of spermiogenesis i condensation and elongation of N i formation of the acrosome cover the anterior and lateral portion of n contain hydrolytic enzymes for fertilization li. formation of flagellum: for motility iV formation of mitochondria sheath V. discharge of useless organelle and cytoplasm
---the processes of spermiogenesis i. condensation and elongation of N ii. formation of the acrosome -cover the anterior and lateral portion of N -contain hydrolytic enzymes for fertilization iii. formation of flagellum: for motility iv. formation of mitochondria sheath v. discharge of useless organelle and cytoplasm
晚精子 ② Sertoli cell structure: 精子细格 次级辖母细 LM 支持细 /columnar or pyramidal cell 初级精母细胞 /rest on basal lamina 紧密连报 精原雅 extending into lumen 括 肌样 /no clear boundar ary elongated N: triangular, ovoid, paler-stained with prominent nucleolus
② Sertoli cell ---structure: LM: /columnar or pyramidal cell /rest on basal lamina /extending into lumen /no clear boundary /elongated N: triangular, ovoid, paler-stained, with prominent nucleolus