The ethmoid and sphenoid bones are formed by ________ ossification.

A) endochondral
B) intramembranous

Ethmoid

A spongy bone located between the eyes that forms part of the nasal cavity and the orbits of the eyes, contributing to the structure of the face and the sense of smell.

Sphenoid

A complex bone at the base of the skull, involved in the formation of the cranial floor and containing the sphenoid sinus.

Intramembranous

Pertains to a process of bone development where bone forms directly from mesenchymal tissue without a cartilage model.