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Sperm Structure and Semen Composition01:22

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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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...
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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.
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Sperm Morphology in Neotropical Primates.

Eliana R Steinberg1, Adrián J Sestelo2, María B Ceballos3

  • 1Grupo de Investigación en Biología Evolutiva (GIBE), EGE, IEGEBA, CONICET, FCEyN, Universidad de Buenos Aires, Pab II, Ciudad Universitaria, Intendente Güiraldes 2160, Ciudad Autónoma de Buenos Aires C1428EGA, Argentina. steinberg@ege.fcen.uba.ar.

Animals : an Open Access Journal From MDPI
|October 24, 2019
PubMed
Summary
This summary is machine-generated.

Sperm morphometry in neotropical primates reveals evolutionary trends. Ancestral primate sperm were shorter and narrower, with derived species showing larger heads and increased total length, influenced by sexual selection.

Keywords:
Platyrrhinisperm competitionsperm morphometry

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Area of Science:

  • Zoology
  • Evolutionary Biology
  • Primatology

Background:

  • Sperm morphology serves as a valuable tool in mammalian taxonomy and phylogeny.
  • Understanding sperm morphometrics aids in reconstructing evolutionary relationships and inferring selective pressures.

Purpose of the Study:

  • To compare sperm morphometry across five neotropical primate species from the Atelidae and Cebidae families.
  • To investigate evolutionary trends in sperm morphology within these primate families using phylogenetic analysis.

Main Methods:

  • Collected semen samples from five neotropical primate species.
  • Measured key sperm parameters (head length/width, acrosome length, midpiece length/width, tail length) for 100 spermatozoa per individual.
  • Integrated morphometric data with existing literature and phylogenetic information from 20 species.

Main Results:

  • Identified narrower and shorter spermatozoa as the ancestral form for Cebidae, with derived groups showing larger heads.
  • Observed an increase in total sperm length and midpiece length in Atelidae spermatozoa.
  • Noted a trend towards narrower sperm heads in more derived Ateles species and increased sperm length in derived species across both families.

Conclusions:

  • Sperm morphometry provides insights into primate evolutionary history and diversification.
  • Observed changes in sperm morphology likely reflect adaptations related to sperm competition and sexual selection pressures.
  • Phylogenetic analysis supports evolutionary trends in sperm size and shape within Cebidae and Atelidae.