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Sperm and egg fusing (fertilisation) Dimensions of the human sperm head measured from a 39-year-old healthy human subject The mammalian sperm cell can be divided in 2 parts connected by a neck: Head: contains the nucleus with densely coiled chromatin fibers, surrounded anteriorly by a thin, flattened sac called the acrosome , which contains ...
Human_sperm_under_microscope.webm (WebM audio/video file, VP9, length 1 min 8 s, 640 × 480 pixels, 2.63 Mbps overall, file size: 21.26 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
In mammals, the sex of the offspring is determined by the sperm cell: a spermatozoon bearing an X chromosome will lead to a female (XX) offspring, while one bearing a Y chromosome will lead to a male (XY) offspring. Sperm cells were first observed in Antonie van Leeuwenhoek's laboratory in 1677. [2] Human sperm under microscope
The process of spermatogenesis as the cells progress from primary spermatocytes, to secondary spermatocytes, to spermatids, to Sperm Cycle of the seminiferous epithelium of the testis Spermatocytogenesis is the male form of gametocytogenesis and results in the formation of spermatocytes possessing half the normal complement of genetic material.
I did the diagram myself based on the one found on the book "Gray's anatomy" 36th edition, Williams & Warwick, 1980; and a diagram found of the review "Formation and organization of the mammalian sperm head" from Kiyotaka Toshimori and Chizuro Ito. (Chiba, Japan). Author: Mariana Ruiz Villarreal: Permission (Reusing this file)
Sperm (pl.: sperm or sperms) is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one). Animals produce motile sperm with a tail known as a flagellum, which are known as spermatozoa, while some red algae and fungi produce non-motile ...
Sertoli cells function to nourish the developing sperm cells. They secrete androgen-binding protein , a binding protein which increases the concentration of testosterone. There are two types: convoluted and straight, convoluted toward the lateral side, and straight as the tubule comes medially to form ducts that will exit the testis.
The overall structure of spermatozoa is very specialized as the cell has fully differentiated and matured. As spermatozoa, the cell no longer undergoes division. It consists of a head, midpiece, and flagella tail for motility. Head: As the head of the sperm, it is an ovular shape consisting of the nucleus and the acrosome. [4]