National Certification Board for Therapeutic Massage & Bodywork (NCBTMB) Practice Exam

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What is true about the ethmoid bone?

It is the smallest bone in the skull

It lies between the nasal cavity and the orbits

The ethmoid bone is accurately described by being situated between the nasal cavity and the orbits. This bone plays a significant role in forming the nasal septum and the lateral wall of the nasal cavity, as well as contributing to the structure of the orbits, which house the eyes. Its placement is crucial because it supports the nasal structures and contributes to the overall functionality of the respiratory system by allowing airflow and olfactory senses.

In contrast, the smallest bone in the skull is typically recognized as the stapes located in the middle ear, not the ethmoid bone. The ethmoid does not form the upper jaw; that structure is formed by the maxilla. As for being part of the lateral skull base, the ethmoid is situated more centrally and is not classified in this category, which typically includes bones like the temporal or sphenoid bones.

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It forms the upper jaw

It is part of the lateral skull base

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