Laura Maria Andrade Silva, Ricardo Hsieh, Silvia Vanessa Lourenço, Bruno de Oliveira Rocha, Ricardo Romiti, Neusa Yuriko Sakai Valente, Alessandra Anzai and Juliana Dumet Fernandes
The presence of hair follicles is one of the main characteristics of mammals. In each new follicular cycle, the embryonic developmental steps are repeated to form a new hair. It is a complex structure, its functions ranging from temperature regulation, physical protection, camouflage, and social interactions. In addition, it is also an endocrine organ capable of producing and locally converting many hormones. In this review, we will describe the main anatomical, embryological, and physiological properties of the hair follicle, as well as their clinical importance.
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