
Leydig cell
Androgen-producing cell adjacent to the seminiferous tubules of the testicle

Androgen-producing cell adjacent to the seminiferous tubules of the testicle
Leydig cells, also known as interstitial cells of the testes and interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle and produce testosterone in the presence of luteinizing hormone (LH). They are polyhedral in shape and have a large, prominent nucleus, an eosinophilic cytoplasm, and numerous lipid-filled vesicles. Males have two types of Leydig cells that appear in two distinct stages of development: the fetal type and the adult type.
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