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PIMA BIO130
CHP8 Skeletal; Cranial Bones and Their Markings; Ethmoid
| Question | Answer |
|---|---|
| Ethmoid | Complex irregular bone that helps make up the anterior portion of the cranial floor, medial walls of the orbits, upper parts of the nasal septum, and sidewalls and part of the nasal roof; lies anterior to the sphenoid and posterior to the nasal bones |
| Cribiform plate | Olfactory nerves pass through numerous holes in this horizontal plate |
| Crista galli | Meninges (membranes around the brain) attach to this process |
| Perpendicular plate | Forms the upper part of the nasal septum |
| Ethmoid sinuses | Honeycombed, mucosa-lined air spaces within the lateral masses of the bone |
| Superior and middle nasal conchae (turbinates) | Help form the lateral walls of the nose |
| Ethmoidal labyrinth | Hollow lateral masses of the rthmoid; contain many air spaces (ethmoid cells or sinuses); the inner surface forms the superior and middle conchae |
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