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==Fig. 4. Diagram of a human spermatozoon==


Special preparations of spermatozoa reveal other details of structure (Fig. 4). The body contains a delicately fibrillated cord, the axial thread, which is continued throughout the tail, narrowing to a point at its terminus. Surrounding the axial thread is a capsule of cytoplasm which, however, does not extend to the tip of the tail, thus leaving the axial thread naked for a short distance. In the body the cytoplasm contains a spiral fiber, perhaps of a mitochondrial nature, winding round the axial filament; other mitochondria also are present. The body contains the centrosome which takes the form of a double structure; one part, the anterior end knob, is attached to the posterior surface of the head close to the nucleus, the other part, the posterior end knob, is situated a little farther back. A derivative of the centrosome, as shown during development of the spermatozoon, is the end ring which marks the boundary between body and tail.




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[[Category:Human]] [[Category:Spermatozoa]] [[Category:Cartoon]]

Latest revision as of 22:29, 16 February 2014

Fig. 4. Diagram of a human spermatozoon

Special preparations of spermatozoa reveal other details of structure (Fig. 4). The body contains a delicately fibrillated cord, the axial thread, which is continued throughout the tail, narrowing to a point at its terminus. Surrounding the axial thread is a capsule of cytoplasm which, however, does not extend to the tip of the tail, thus leaving the axial thread naked for a short distance. In the body the cytoplasm contains a spiral fiber, perhaps of a mitochondrial nature, winding round the axial filament; other mitochondria also are present. The body contains the centrosome which takes the form of a double structure; one part, the anterior end knob, is attached to the posterior surface of the head close to the nucleus, the other part, the posterior end knob, is situated a little farther back. A derivative of the centrosome, as shown during development of the spermatozoon, is the end ring which marks the boundary between body and tail.


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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.



Cite this page: Hill, M.A. (2024, March 29) Embryology Bailey004.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey004.jpg

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