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}}</ref> These reports sometimes conflict with other sources on clitoral anatomy or those concerning the nerve endings in the human penis. For example, while some sources estimate that the human penis has 4,000 nerve endings,<ref name="Carroll 2012"/><ref name="Di Marino 2014"/> other sources state that the glans or the entire penile structure have the same amount of nerve endings as the [[clitoral glans]],<ref>{{REFbook

Some sources state that in contrast to the glans penis, the [[clitoral glans ]] lacks smooth muscle within its fibrovascular cap and is thus differentiated from the erectile tissues of the [[clitoris]] and bulbs; additionally, bulb size varies and may be dependent on age and estrogenization.<ref name="Ginger Yang 2011">{{REFbook