metapterygoid

Term ID

ZFA:0000240

Synonyms

metapterygoids

Definition

The metapterygoid is a posterior bone that ossifies in the cartilaginous palatoquadrate arch. It first appears as a rod of bone with an anterodorsally projecting process from the middle of the dorsal surface (6.4 mm). The adult metapterygoid is roughly rectangular in shape with rounded corners and an anterodorsally projecting spine that meets the entopterygoid medially in a synostosis at its posteromedial edge. The posterior end curves dorsally to form the posteroventral surface of the orbit.

Appears at

Larval:Days 14-20 (14d-21d, 6.2mm, 10 teeth)

Evident until