Dictionary » R » Retractor



One who, or that which, retracts. Specifically:

In breech-loading firearms, a device for withdrawing a cartridge shell from the barrel.

(Science: anatomy) A muscle serving to draw in any organ or part.

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help for naja

... following muscles: M. adductor mandibular externus superficialis (yellow); M. levator pterygoideus (purple); M. protractor pterygoideus (red); M. retractor pterygoideus (blue); M. pterygoideus (green). e, ectopterygoid; m, maxilla; pa, palatine; pf, prefrontal; pt, pterygoid. These snakes are ...

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by David George
Wed Apr 05, 2006 9:45 am
Forum: Zoology Discussion
Topic: help for naja
Replies: 1
Views: 5544

How snakes mate?

... males have a pair of intromittent organs called hemipenes, protrusible saclike diverticula at the entrance of the cloaca. During copulation, the retractor muscles of the hemipenes relax, turning the sacs inside out and allowing the flow of semen along a groove into the female's cloaca. Only one ...

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by clarence
Mon Oct 03, 2005 5:13 pm
Forum: Zoology Discussion
Topic: How snakes mate?
Replies: 4
Views: 15553

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