head cap


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ac·ro·some

(ak'rō-sōm),
A caplike organelle or saccule derived from Golgi elements that surround the anterior two thirds of the nucleus of a sperm. Enzymes contained within this structure probably facilitate the sperm's penetration of the zona pellucida of the oocyte.
Synonym(s): acrosomal cap, head cap
[acro- + G. soma, body]
Farlex Partner Medical Dictionary © Farlex 2012

head cap

(hed kap)
A device fitted closely to the skull; used for fixed anchorage in external traction.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The foundry, located in Hutchins, Texas, constructed what other companies had not been able to do-high-quality head caps for the MK 22, MOD 4 rocket motor.