Podcast
Questions and Answers
What does the Greek word 'Ethmos' mean, which is related to the Ethmoid bone?
What does the Greek word 'Ethmos' mean, which is related to the Ethmoid bone?
- Bone
- Sieve (correct)
- Structure
- Cavity
Which part of the Ethmoid bone forms the roof of the nasal cavity?
Which part of the Ethmoid bone forms the roof of the nasal cavity?
- Cribriform Plate (correct)
- Ethmoid Labyrinths
- Orbital Complex
- Perpendicular Plate
What is located below the Ethmoid bone?
What is located below the Ethmoid bone?
- Nasal cavity (correct)
- Cranial cavity
- Orbit
- Ethmoid labyrinths
Which of these structures is not a part of the Ethmoid bone?
Which of these structures is not a part of the Ethmoid bone?
What part of the Ethmoid bone contributes to the medial wall of the orbit?
What part of the Ethmoid bone contributes to the medial wall of the orbit?
What are the large masses located on either side of the perpendicular plate in the ethmoid bone called?
What are the large masses located on either side of the perpendicular plate in the ethmoid bone called?
What may occur if the cribriform plate is fractured?
What may occur if the cribriform plate is fractured?
What is a potential consequence of an ethmoid labyrinth fracture?
What is a potential consequence of an ethmoid labyrinth fracture?
What symptom can result from inflammation of the ethmoid sinuses?
What symptom can result from inflammation of the ethmoid sinuses?
What might cause damage to the ethmoid bone?
What might cause damage to the ethmoid bone?
Flashcards
What is the Ethmoid Bone?
What is the Ethmoid Bone?
A small, unpaired bone that sits within the paranasal sinuses, contributing to the medial wall of the orbit and forming part of the anterior cranial fossa.
What is the Cribriform Plate?
What is the Cribriform Plate?
This thin, perforated plate forms the roof of the nasal cavity. The olfactory fibres pass through these holes, carrying scent information to the brain.
What is the Perpendicular Plate?
What is the Perpendicular Plate?
This part of the Ethmoid bone sits perpendicular to the Cribriform Plate and forms the majority of the nasal septum, the wall dividing the nasal cavity.
What are the Ethmoid Labyrinths?
What are the Ethmoid Labyrinths?
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How is the Ethmoid Bone innervated?
How is the Ethmoid Bone innervated?
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Ethmoid Air Cells
Ethmoid Air Cells
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Anosmia
Anosmia
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Ethmoid Sinusitis
Ethmoid Sinusitis
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Orbital Emphysema
Orbital Emphysema
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Rhinorrhea
Rhinorrhea
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Study Notes
The Ethmoid Bone
- Originates from the Greek word "Ethmos," meaning sieve.
- This reflects its lightweight and spongy structure.
- It's a small, unpaired bone, forming part of the orbital complex.
- Located within the paranasal sinuses.
- Contributes to the medial wall of the orbit and forms part of the anterior cranial fossa.
- Separates the nasal cavity from the cranial cavity, inferiorly and superiorly, respectively.
- Innervation involves 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 olfactory fibres.
- The crista galli projects superiorly from the 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, which are the ethmoid sinuses.
Clinical Relevance
- Fracture of the cribriform plate can cause anosmia.
- Ethmoid labyrinth fracture can allow communication between the nasal cavity and orbit, potentially leading to orbital emphysema.
- Inflammation can cause rhinorrhoea (discharge of clear watery fluid) from one side of the nose and/or rhino sinusitis
- Damage to the ethmoid bone can result from infection, inflammation, or facial trauma.
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Description
This quiz covers the anatomy and functions of the ethmoid bone, focusing on its structure, including the cribriform plate, perpendicular plate, and ethmoid labyrinths. Test your knowledge on how this bone contributes to the orbit and nasal cavity.
