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Questions and Answers
What is the primary function of the cribriform plate?
What is the primary function of the cribriform plate?
- Forms the floor of the nasal cavity.
- Houses the olfactory nerves. (correct)
- Separates the nasal cavity from the cranial cavity.
- Provides support for the nasal septum.
Which part of the ethmoid bone is responsible for forming the superior portion of the nasal septum?
Which part of the ethmoid bone is responsible for forming the superior portion of the nasal septum?
- Crista Galli
- Cribriform Plate
- Perpendicular Plate (correct)
- Ethmoid Labyrinths
What is the anatomical significance of the Ethmoid air cells?
What is the anatomical significance of the Ethmoid air cells?
- They are responsible for regulating airflow within the nasal cavity.
- They are involved in producing mucus for the respiratory system.
- They help to lighten the skull and provide resonance for sound. (correct)
- They contribute to the formation of the frontal sinuses.
What is the common symptom associated with a fracture of the cribriform plate?
What is the common symptom associated with a fracture of the cribriform plate?
Which of the following conditions could be caused by a fracture of the ethmoid labyrinths?
Which of the following conditions could be caused by a fracture of the ethmoid labyrinths?
Which of the following is a potential consequence of a fracture of the cribriform plate?
Which of the following is a potential consequence of a fracture of the cribriform plate?
What is the name of the bony projection that extends superiorly from the cribriform plate?
What is the name of the bony projection that extends superiorly from the cribriform plate?
Flashcards
Ethmoid Bone
Ethmoid Bone
A lightweight, spongy bone forming part of the orbital complex and cranial fossa.
Location of Ethmoid Bone
Location of Ethmoid Bone
Located in the paranasal sinuses, forms medial wall of the orbit and separates nasal and cranial cavities.
Cribriform Plate
Cribriform Plate
The roof of the nasal cavity, perforated by olfactory fibers and features the crista galli.
Perpendicular Plate
Perpendicular Plate
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Ethmoid Labyrinths
Ethmoid Labyrinths
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Clinical Relevance 1
Clinical Relevance 1
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Clinical Relevance 2
Clinical Relevance 2
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Ethmoid Sinuses
Ethmoid Sinuses
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Study Notes
Ethmoid Bone
- Originates from the Greek word "Ethmos," meaning sieve, relating to its lightweight, spongy structure.
- A small, unpaired bone, 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.
- Innervation: 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 with numerous olfactory fibers.
- 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 located on either side of the perpendicular plate.
- Contain ethmoid air cells, which are the ethmoid sinuses.
Clinical Relevance
- Fracture of the cribriform plate may cause anosmia.
- Ethmoid labyrinth fractures can allow communication between the nasal cavity and orbit, causing orbital emphysema.
- Inflammation can cause rhinosinusitis and potentially rhinorrhea (leakage of cerebrospinal fluid) from one side of the nose.
- Damage to the ethmoid bone can result from infection or facial trauma.
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