Volume of the Sperm Mid Piece

Certainty Style Key

Certainty styling is being phased out topic by topic.

Hover over keys for definitions:
True   Likely   Speculative
Human Uniqueness Compared to "Great Apes": 
Likely Difference
Human Universality: 
Individual Universal (All Individuals Everywhere)
MOCA Topic Authors: 

Human and great ape sperm share the typical paddle-shaped morphology of their sperm. Hominoid sperm also share very similar overall length and width. The only significant difference documented to date is the existence of a significantly more voluminous mid-piece (the cylindrical middle portion of sperm containing the spirally-arranged mitochondria) in the sperm of chimpanzees and bonobos. Chimpanzee sperm also contain up to twice as many mitochondria as do human sperm. It has been theorized that this difference reflects a greater need for energy and motility in the two species of Pan where multi-male mating systems leads to higher levels of sperm competition.

Related MOCA Topics
Related Topics (hover over title for reason):
Referenced By:
Topic Certainty
Advertisement of Ovulation Speculative
Mating Effort Likely


  1. Sperm competition: motility and the midpiece in primates., Anderson, Matthew J., and Dixson Alan F. , Nature, 2002 Apr 4, Volume 416, Issue 6880, p.496, (2002)