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Questions and Answers
What is the origin of the name 'Ethmoid'?
Which structure is formed by the Perpendicular Plate of the Ethmoid bone?
What condition results from a fracture of the cribriform plate?
Which of the following does NOT contribute to the structure of the Ethmoid bone?
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What can occur due to inflammation of the Ethmoid bone?
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Which part of the Ethmoid bone contains air cells?
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How does a fracture of the Ethmoid labyrinth potentially affect the nasal cavity?
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Which feature projects superiorly from the cribriform plate?
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Study Notes
Ethmoid Bone
- Originates from the Greek word "Ethmos," meaning "sieve," reflecting its lightweight and spongy structure.
- Small, unpaired bone contributing to the orbital complex.
- Located in the paranasal sinuses.
- Part of the medial wall of the orbit and forms part of the anterior cranial fossa.
- Separates the nasal cavity inferiorly and the cranial cavity superiorly.
- Innervated by the Anterior and Posterior Ethmoidal Branches.
Features of the Ethmoid Bone
- Composed of four parts:
- Cribriform Plate
- Perpendicular Plate
- Ethmoid Labyrinths
Cribriform Plate
- Forms the roof of the nasal cavity.
- Perforated by numerous olfactory fibers.
- Crista galli projects superiorly from the cribriform plate.
Perpendicular Plate
- Forms the superior two-thirds of the nasal septum.
- Descends from the cribriform plate.
Ethmoid Labyrinths
- Large masses situated on either side of the perpendicular plate.
- Contain Ethmoid air cells (Ethmoid sinuses).
Clinical Relevance
- Cribriform plate fracture can cause anosmia (loss of smell).
- Ethmoid labyrinth fracture allows communication between the nasal cavity and orbit, potentially causing orbital emphysema.
- Inflammation can lead to rhinosinusitis.
- Damage to the ethmoid bone can be caused by infection, inflammation, or facial trauma.
- Inflammation can cause rhinorrhea, where cerebrospinal fluid enters the nasal cavity and drains as clear watery fluid from one side of the nose.
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Description
Test your knowledge on the ethmoid bone, its structure, and its features. This quiz covers its origins, parts, and functions within the nasal and cranial cavities. Perfect for students of anatomy and medical sciences!
