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using REFbook key ISBN
|title=Handbook of the Mammals of the World. 1: Carnivores
|publisher=Lynx Edicions
|isbnISBN=978-84-96553-49-1
}}</ref><ref>{{REFbook
|last=Roughgarden
|pages=37-40
|publisher={{UNI|University of California|UCSF}} Press
|isbnISBN=978-0-520-24073-5
}}</ref><ref>{{REFbook
|last=Wingfield
|edition=2
|publisher=Gulf Professional Publishing
|isbnISBN=978-0-12-515402-4
}}</ref>
|pages=92-93
|publisher=Macmillan
|isbnISBN=978-0805072815
}}</ref><ref>{{REFjournal
|last=O'Connell
|publisher=Jones & Bartlett Learning
|page=95
|isbnISBN=978-0-7637-7660-2
}}</ref><ref>{{REFbook
|last=Weiten
|title=Psychology Applied to Modern Life: Adjustment in the 21st century
|publisher=Cengage Learning
|isbnISBN=978-1-111-18663-0
|page=386
}}</ref><ref name="Caroll2012">{{REFbook
|title=Sexuality Now: Embracing Diversity
|publisher=Cengage Learning
|isbnISBN=978-1-111-83581-1
|pages=110–111, 252
}}</ref> In humans and other mammals, it develops from an outgrowth in the embryo called the genital tubercle. Initially undifferentiated, the tubercle develops into either a penis or a clitoris during the development of the reproductive system depending on exposure to androgens (which are primarily male hormones). The clitoris is a complex structure, and its size and sensitivity can vary. The glans (head) of the human clitoris is roughly the size and shape of a pea and is estimated to have about 8,000 sensory nerve endings.<ref name=WP/><ref name="Caroll2012"/>