A sustentacular cell is a type of cell primarily associated with structural support.

One type of sustentacular cell is the Sertoli cell

Sertoli cell

A Sertoli cell is a 'nurse' cell of the testes that is part of a seminiferous tubule.It is activated by follicle-stimulating hormone and has FSH-receptor on its membranes.-Functions:...

, in the testicle

Testicle

The testicle is the male gonad in animals. Like the ovaries to which they are homologous, testes are components of both the reproductive system and the endocrine system...

. It is located in the walls of the seminiferous tubules and supplies nutrients to sperm.

Another type of sustentacular cell is found in the Olfactory epithelium

Olfactory epithelium

The olfactory epithelium is a specialized epithelial tissue inside the nasal cavity that is involved in smell. In humans, it measures about 1 square centimetre and lies on the roof of the nasal cavity about 7 cm above and behind the nostrils...

.The Internal Ear (Organ of Corti) and the taste buds also contain the sustentacular cell.

About 40% of carcinoids have a scattering of sustentacular cells, which stain positive for S-100.