Ethmoid Bone Revision PDF
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Uploaded by WiseTropicalIsland4758
London South Bank University
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Summary
This document provides detailed information about the ethmoid bone, its location, articulations, structure, and clinical relevance. It covers the cribriform plate, perpendicular plate, and ethmoid labyrinth, and explains conditions related to damage or issues with the bone.
Full Transcript
Ethmoid bone Location & Articulations Situated within paranasal sinuses. Articulates with; Viscero; vomer, inferior nasal conchae, nasal, maxilla, palatine, lacrimal. Neuro; frontal and sphenoid. Structure Small, unpaired bone. Contributes to medial wall of orbi...
Ethmoid bone Location & Articulations Situated within paranasal sinuses. Articulates with; Viscero; vomer, inferior nasal conchae, nasal, maxilla, palatine, lacrimal. Neuro; frontal and sphenoid. Structure Small, unpaired bone. Contributes to medial wall of orbit, and middle cranial fossa. Separates inferior from nasal cavity and superiority from cranial cavity. Forms; nasal septum, roof and lateral walls of nasal cavity. Small contribution to floor of anterior cranial fossa. 3 main parts — Cribriform plate x1 — Forms roof of nasal cavity. Perforated by numerous olfactory (smell) nerve fibres. Crista galli projects superiorly. Perpendicular plate x1 — Thin, quadrilateral plate of bone. Forms superior two thirds of nasal septum. Descends vertically in midline from cribriform plate. Ethmoid labyrinth x2 — Large lateral masses located either side of perpendicular plate. Bulk of ethmoid bone. Contain Ethmoid air cells/Ethmoid sinuses. Warming and moistening of inspired air. Clinical Relevance Damage to ethmoid bone may be caused by infection, inflammation or facial trauma. Cribriform plate # can cause anosmia (loss of smell). Ethmoid labyrinth # may allow communication between nasal cavity and orbit (orbital emphysema - cross over of fluids). Inflammation can cause sinusitis or rhinorrohea (cerebral spinal fluid enters nasal cavity and drains out).
