Anatomy study note · Head and neck

Ethmoid

A light bone between the orbits forming the roof and part of the walls and septum of the nasal cavity.

Key points

• Cribriform plate (CN I) + crista galli.
• Perpendicular plate = nasal septum.
• Superior + middle conchae.
• Ethmoid: cartilage bone (nasal capsule).
• Bone: type I collagen + hydroxyapatite.
• Osteoblast builds, osteocyte maintains, osteoclast resorbs.

The full note in the atlas also covers

Features · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 12, PDF pp. 1487–1488, 1494, 1499
• Inderbir Singh’s Human Embryology, ch. 10, PDF pp. 140–141
• BRS Cell Biology & Histology, 7th ed., ch. 7, PDF pp. 121–125, 130; ch. 15, PDF p. 269

More from the head and neck

• External carotid artery
• External ear
• External jugular vein
• External nose
• Eyelids and conjunctiva
• Facial bones of the orbit and nasal cavity
• Facial nerve
• Frontal bone
• Frontal lobe
• Genioglossus
• Geniohyoid
• Glossopharyngeal nerve

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