(I corrected some statements and added information.)
A '''dermal bone''' or '''membrane bone''' is a bony structure derived from [[intramembranous ossification]] forming components of the [[vertebrate]] [[skeleton]] including the [[skull]], [[jaw]]s, [[gill]]
The function of some dermal bone is conserved throughout vertebrates, although there is variation in shape and in the number of bones in the [[skull roof]] and postcranial structures. In [[bony fish]], dermal bone is found in the fin [[Ray (fish fin anatomy)|rays]] and scales. Special examples of dermal bones include the [[clavicle]], [[patella]], and ''[[os cordis]]''.