Skip to main content

Spermatogenesis-Formation of spermatids and spermiogenesis

SPERMATOGENESIS-FORMATION OF SPERMATIDS AND SPERMIOGENESIS

Spermatogenesis is the process by which male germ cells, called spermatogonia, undergo a series of divisions and differentiations to ultimately give rise to spermatozoa. The process involves two main phases: spermatocytogenesis and spermiogenesis.

1. Spermatocytogenesis:

Spermatocytogenesis involves the proliferation and differentiation of spermatogonia into spermatocytes, which undergo meiosis to form spermatids.

  • Spermatogonia:
    • Undifferentiated germ cells located along the basal lamina of the seminiferous tubules.
    • Divide by mitosis to maintain the germ cell population.
  • Primary Spermatocytes:
    • Result from the differentiation of spermatogonia.
    • Undergo the first meiotic division (meiosis I) to produce secondary spermatocytes.
  • Secondary Spermatocytes:
    • Formed after meiosis I.
    • Undergo the second meiotic division (meiosis II) to produce haploid spermatids.

2. Spermiogenesis:

Spermiogenesis is the process by which haploid spermatids are transformed into mature, motile spermatozoa.

  • Golgi Phase:
    • The Golgi apparatus forms a structure called the acrosomal vesicle, which contains enzymes for fertilization.
  • Cap Phase:
    • The acrosomal vesicle spreads over the nucleus, forming the acrosome.
    • The centriole (basal body) organizes the microtubules of the sperm tail.
  • Acrosome Phase:
    • The nucleus elongates, and the chromatin condenses.
    • The flagellum develops from the assembly of microtubules.
  • Maturation Phase:
    • Excess cytoplasm is shed, and the spermatozoon is released into the lumen of the seminiferous tubule.
  • Spermatozoa:
    • The mature spermatozoon consists of a head, midpiece, and tail.
      • Head: Contains the nucleus with condensed chromatin and the acrosome with enzymes for fertilization.
      • Midpiece: Contains mitochondria arranged in a helical pattern, providing energy for sperm motility.
      • Tail: The flagellum that propels the sperm for locomotion.
  • Spermiation:
    • The process by which mature spermatozoa are released from Sertoli cells into the lumen of the seminiferous tubules.

3. Sperm Transport:

  • Spermatozoa move from the seminiferous tubules to the rete testis, the epididymis, and then through the vas deferens for storage until ejaculation.

4. Maturation in the Epididymis:

  • Spermatozoa undergo further maturation and acquire the ability to swim and fertilize eggs during their transit through the epididymis.

In summary, spermatogenesis is a complex and highly regulated process that occurs in the seminiferous tubules of the testis. It involves the differentiation of spermatogonia into spermatids through meiosis and the subsequent transformation of spermatids into mature, motile spermatozoa during spermiogenesis. The resulting spermatozoa are then transported, stored, and undergo final maturation in the epididymis, gaining the ability to fertilize eggs.

Popular posts from this blog

Charter of Queen Elizabeth I & the East India Company

  Charter of Queen Elizabeth I & the East India Company   Background Francis Drake’s Voyage (1580) : First Englishman to sail around the world, inspiring exploration. Defeat of Spanish Armada (1588) : England’s naval victory boosted confidence to challenge Spain/Portugal in global trade. Portuguese & Dutch Profits : Europeans made huge money from Asian spices, textiles, and goods → England wanted a share! Formation of the East India Company 1599 : Group of English merchants ( Merchant Adventurers ) formed a company to trade in Asia. 31 December 1600 :  Queen Elizabeth I  granted them a  Royal Charter , giving: Exclusive Rights : Only this company could trade east of Africa (monopoly). Name : “Governor and Company of Merchants of London trading into the East Indies” (later called  East India Company ). 1609 : Monopoly extended  indefi...
Read more

Welcome to Let Me Explain (A Part of bionexts.in)

  Welcome to my Blogspot! Here, I explain various topics related to Bio-Medical Science with detailed class study notes. I trust it will be helpful for you. MISSION OF THE PROJECT My mission is to provide you Class Study Notes with a clear understanding of various Bio-Medical related topics, especially professional courses, using easy language. Don't worry; I'll also include other topics.  ☺️ CLICK ANY ONE OF THE SUBJECTS Immunology   Techno Professional Skill  Developmental Biology   Molecular Biology Cell Biology Genetical Engineering Biostatistics Bioinformatics Basic Acclimatization Skill Animal Biotechnology Medical Biotechnology Industrial Biotechnology Plant and Agricultural Biotechnology Research Methodology, IPR and Bioethics Are You Preparing For The GATE Examination Also! Click Here  Click Here   Are You Preparing For The UPSC Examination Also! Click Here Yes And Normal General Science Click Here And I'm going to explain to you the biology t...
Read more

Disclaimer

          TERMS OF SERVICE Please read these terms and conditions carefully before using letmeexplain1.blogspot.com operated by  atanudeka78@gmail.com Your access to and use of the Service is conditioned upon your acceptance of and compliance with these Terms. These Terms apply to all visitors, users, and others who access or use the Service. By accessing or using the Service, you agree to be bound by these Terms. If you disagree with any part of the terms, then you may not access the Service. 1. Intellectual Property  :  The Service and its original content, features, and functionality are owned by Atanu Deka and are protected by international copyright, trademark, patent, trade secret, and other intellectual property or proprietary rights laws. 2. User Accounts:  When you create an account, you must provide accurate, complete, and current information.  You are responsible for maintaining the confidentiality of your account and pas...
Read more