Primitive male germ cell that gives rise to primary spermatocytes in spermatogenesis.

Sertoli cells

Elongated striated cells in the seminiferous tubules of the testis to which the spermatids become attached and from which they derive...


outer layer of the trophoblasts that forms finger-like projections that invade the endometrium to secure the blastocyst firmly in place within the...


Male hormone produced primarily by the testes that is the main androgen responsible for inducing and maintaining secondary sex characteristics.

Theca cells

LH-sensitive cells surrounding the outside of the follicle; those of the dominant follicle convert cholesterol to androgens under the influence of...