Spermatogenesis PDF

Figure 27.6 Structure of Sperm by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0) Spermatogenesis Rebecca Reid Centre for Anatomy and Human Identification  Learning Outcomes Explain the process of gametogen...

Figure 27.6 Structure of Sperm by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0) Spermatogenesis Rebecca Reid Centre for Anatomy and Human Identification  Learning Outcomes Explain the process of gametogenesis in males Describe the main stages of spermatogenesis Spermatogenesis  cells surround > developing sperm of tubule hollow centre Mature Male Reproductive System - > the lumen - into ↳ sperm released of testes duct system ↳then travel to epidymis where sperm continues to mature Loading… -gonads ↳male reproductive organ Here that a spenment occurs Figure 27.2 Testicular Reproductive System and Figure 27.4 Anatomy of the Testis by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0) Spermatogenesis  Sperm Cells (Spermatozoa) Head Contains haploid nucleus Tail Acrosomal cap containing lysosomal enzymes Flagellum ↓ cap on head - contains enzymes important for preparing sperm for fertilization T contains haploid nucleus every little cytoplasm Mid-piece Tightly packed mitochondria & I ↳ ATP made to power flagellum which allows sperm to move Figure 27.6 Structure of Sperm by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0) Spermatogenesis  cells - from primordial germ Sperm formation ↳ occurs in seminiferous tubules Spermatogenesis Whole process 64-74 days and produces 300 million sperm cells per day. like large Infants sperm looks Begins at puberty and continues throughout life > in - pale cells ↳ Sex cordshollowt tubni support cells become sertle as Spermatogonial Phase spermatogonia mitosis to replace divide by themselfes Loading… ↳provide population of a developing locateda commited spermagonia Spermatocyte Phase graduallys are ↳ primary spermatocyte undergo meiosis - located close diploid to basement ↳ go from membrane to haploid Spermatid Phase ↳ spermatids into differentiate maturesperm Spermatogenesis Figure 27.5 Spermatogenesis by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0)  ↓ form spermatogoniathe ridge of the arrive at cells - once primordial germ genital maleembryo- they becometo the cord Spermatogonial Phase sex hollows out to form cord Primordial germ cells form spermatogonia puberty > sex - tubules seminiferous Type A dark cells (Ad): stem cells intervals ↳ divide mitotically@ reg of type A to either rise to pair give become dark cells OR Type A (pale cells): spermatogonia that undergo mitosis. They divide to produce type B cells. ↳ go under several rounds of mitosis Type B cells: become From Figure 22.9. Schematic diagram illustrating the generations of spermatogenic cells. P. 799, Pawlina (2016) primary spermatocytes to ↳ undergo mitosis become primary spermatocytes Spermatogenesis  Spermatocyte Phase Type B spermatogonia form primary spermatocytes recombinant chromosome by mitosis. make occurs over /crossing V ↳ takes 22 days Primary spermatocytes (2n) undergo Meiosis I to form secondary spermatocytes (1n) crossing over occurs ↑ no Secondary spermatocytes (1n) undergo Meiosis II to form spermatids (1n) - form 4 spermaids Spermatogenesis Figure 27.5 Spermatogenesis by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0)  Spermatid Phase (spermiogenesis) : Stakes 74 days is formation of acrosome condensation of the nucleus o to asma 2) of the neck, middle & tailpiece 3) formation residual bodies Shedding of excess cytoplasm & 4) ↳ end of spermogenesis Changes include: released is Sperm lumen cells into the by Sertoli 1. Formation of the acrosome of the semiferous tubules um further & ↳ then aquire motility 2. Condensation of the nucleus maturation the epidymis in m Figure 2.24, p. 32 from Langman’s Medical 3.Spermatogenesis Embryology 15th Edition Copyright 2024 Wolter Formation of the neck, middle and tail pieces Kluwer 4. Shedding of excess cytoplasm as residual bodies Control of Spermatogenesis ↳ regulated by hormones (H) ~"produced by n to pituitary receptors anterior Leydig cells stimulate gland testosterone production Testosterone binds to Sertoli cells to Figure 27.5 Spermatogenesis by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0) promote spermatogenesis FSH - released by anterior pituitary gland ↳ important for stimulating testicular fluid production of androgen + synthesis receptor proteins Spermatogenesis Figure 27.18 Hormones of Puberty by OpenStax College (2023) is licensed under Attribution 4.0 International (CC BY 4.0)