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→Sensitivity and innervation of the glans penis: Wikify.
The [[dartos|dartos muscle sheet]] in the foreskin produces contractions that are slow, sustained, and may produce great force, such as in cold temperatures.<ref name="jefferson1916">Jefferson G. [http://www.cirp.org/library/anatomy/jefferson/ The peripenic muscle; some observations on the anatomy of phimosis]. ''Surgery, Gynecology and Obstetrics'' 1916 Aug;23(2):177-81.</ref>
The innervation of the glans responds to pressure hence the glans are meant to be stimulated with the [[foreskin ]] as its medium.
While the human glans penis is protopathic, the prepuce contains a high concentration of touch receptors in the [[ridged band]].
In the human [[penis]], the prepuce is known to have ten times more corpuscular sensory receptors than the glans penis.
Most people are surprised to learn that the glans penis is one of the least sensitive parts of the entire body.<ref name="halata1985">Halata Z, Munger BL. [http://www.cirp.org/library/anatomy/halata/ The Neuroanatomical basis for the protopathic sensibility of the human glans penis]. ''Brain Res'' 1986 Apr 23;371(2):205-30.</ref>
The corona of the glans contains scattered free nerve endings, genital end bulbs, and pacinian corpuscles, which transmit sensations of pain and deep pressure. The glans is nearly incapable of detecting light touch.
The results of a fascinating study conducted by Dr. [[Christopher J. Cold]] and Dr. [[Ken McGrath|Kenneth A. McGrath]] demonstrate that the human [[foreskin ]] is an evolutionary advancement over the foreskins of other primates. The human foreskin is far more sophisticated and responsive, as their comparative anatomy studies prove. This is seen most clearly in the evolutionary increase in corpuscular innervation and simultaneous decrease in corpuscular receptors in the human glans relative to the innervation of the foreskin and glans of lower primates.<ref>Cold CJ, [[Ken McGrath|McGrath KA]]. [http://www.cirp.org/library/anatomy/cold-mcgrat/ Anatomy and histology of the penile and clitoral prepuce in primates: an evolutionary perspective of the specializes sensory tissue of the external genitalia]. In: Denniston GC, Hodges MF, Milos FM (eds). ''Male and female circumcision: Medical, Legal, and Ethical Considerations in Pediatric Practice''. New York: Kluwer Academic/Plenum Publishers, 1999. pp. 19-29</ref>
In other words, in monkeys and apes, the [[glans ]] is more sensitive then the foreskin. In humans, this is reversed, so that the foreskin is more sensitive then the glans.
An impressive study performed by objective Chinese researchers conclusively demonstrated that [[circumcision ]] reduces the glans sensitivity to vibration.
"The test group were 1.97 +/- 0.71, 2.64 +/- 1.38, 3.09 +/-1.46 and 2.97 +/- 1.20 respectively before and 1, 2 and 3 months after circumcision, with significant difference between pre- and post-operation (P < 0.05)."(1)