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Spermatogenesis

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

Spermatogenesis

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...

Fertilization

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...

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Related Experiment Video

Updated: Jul 12, 2026

Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy

Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy

Published on: August 16, 2019

Spermiogenesis in soft-shelled turtle, Pelodiscus sinensis.

Li Zhang¹, Xiang-Kun Han, Mei-Ying Li

¹Department of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China.

Anatomical Record (Hoboken, N.J. : 2007)

|August 29, 2007

Summary

This study details the five stages of spermiogenesis in the soft-shelled turtle, Pelodiscus sinensis, using transmission electron microscopy. Key events include nuclear shaping, acrosome formation, and flagellum development during turtle sperm maturation.

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Area of Science:

Reproductive Biology
Cell Biology
Zoology

Background:

Spermiogenesis, the process of sperm maturation, is crucial for male fertility.
Understanding spermiogenesis in reptiles provides insights into vertebrate evolution.
The soft-shelled turtle, Pelodiscus sinensis, offers a unique model for studying reptilian reproductive processes.

Purpose of the Study:

To meticulously describe the ultrastructural changes during spermiogenesis in Pelodiscus sinensis.
To identify and characterize the distinct morphological stages of sperm development in this species.
To provide a detailed ultrastructural atlas of Pelodiscus sinensis spermiogenesis.

Main Methods:

Transmission electron microscopy (TEM) was employed to examine testicular tissues.
Spermatids were analyzed across five distinct developmental stages.
Ultrastructural details of nuclear, acrosomal, flagellar, and cytoplasmic modifications were documented.

Main Results:

Five distinct stages of spermiogenesis were identified, characterized by specific morphological events.
Key events include nuclear elongation, chromatin condensation, acrosome and flagellum development, and cytoplasmic droplet elimination.
Detailed observations cover the formation of the proacrosomal vesicle, subacrosomal granule, manchette, and mitochondrial arrangement.

Conclusions:

The study provides a comprehensive ultrastructural description of spermiogenesis in Pelodiscus sinensis.
The observed stages highlight the complex cellular transformations required for mature sperm formation in this turtle species.
This detailed account serves as a valuable reference for comparative studies in reptilian and vertebrate spermiogenesis.