Epithelioid cells

Lack of free surface.

Interstitial cells of Leydig

Location: testis.

Function: endocrine.

Origin: mesoderm

Luteal cells

Location: ovary

Function: endocrine.

Origin: mesoderm

Parenchyma of the adrenal gland

Function: endocrine.

Origin: mesoderm

Epitelioreticular cells

Location: thymus

Function: endocrine?

Origin: endoderm?