16 Questions
What is the function of the perpendicular plate of the ethmoid bone?
Forms part of the nasal septum
What is the function of the cribriform plate?
Contains foramina for the olfactory nerve
What is the function of the ethmoid labyrinth?
Contains ethmoid paranasal sinuses
What is the function of the uncinate process?
Is a curved piece of bone
What is the function of the cristae galli?
Provides attachment for the falx cerebri
What is the function of the ethmoid bulla?
Is a large elevation of bone
What is the function of the hiatus semilunaris?
Is the space between the uncinate process and the ethmoid bulla
How many ethmoid bones are present in the face?
1
Which part of the ethmoid bone forms the superior surface of the ethmoid and contains numerous foramina for the olfactory nerve?
Cribriform plate
Which structure is located between the uncinate process and the ethmoid bulla?
Hiatus semilunaris
Which part of the ethmoid bone is associated with a small foramen cecum?
Cribriform plate
What is the composition of the ethmoid bone?
Endochondral ossification
Which part of the ethmoid bone forms part of the nasal septum?
Perpendicular plate
What is the purpose of the crista galli?
Provides attachment for the falx cerebri of the meninges
What is the location of the ethmoid paranasal sinuses?
Ethmoid labyrinth
What is the type of bone that forms the majority of the middle part of the face between the orbits?
Porous bone
Study Notes
Ethmoid Bone Characteristics
- The ethmoid bone is a porous bone that forms the major portion of the middle part of the face between the orbits.
- It helps form the orbit, nasal cavity, nasal septum, and anterior cranial fossa.
- There is only one ethmoid bone.
Parts of the Ethmoid Bone
Perpendicular Plate
- A flat plate that descends from the cribriform plate to form part of the nasal septum.
- It articulates with the vomer inferiorly.
Cribriform Plate
- A horizontal bone that forms the superior surface of the ethmoid.
- It contains numerous foramina for the olfactory nerve.
- The crista galli is a vertical plate that extends superiorly from the cribriform plate, providing attachment for the falx cerebri of the meninges.
- It is associated with a small foramen cecum.
Ethmoid Labyrinth
- The largest part of the ethmoid bone.
- It descends inferiorly from the cribriform plate.
- The ethmoid paranasal sinuses are located within the ethmoid labyrinth.
- The ethmoid labyrinth forms two major structures within the nasal cavity:
- Superior nasal concha.
- Middle nasal concha.
- The ethmoid bulla is a large elevation of bone located near the middle ethmoid paranasal sinuses.
- The uncinate process is a curved piece of bone.
- The hiatus semilunaris is located between the uncinate process and the ethmoid bulla.
Ethmoid Bone Characteristics
- The ethmoid bone is a porous bone that forms the major portion of the middle part of the face between the orbits.
- It helps form the orbit, nasal cavity, nasal septum, and anterior cranial fossa.
- There is only one ethmoid bone.
Parts of the Ethmoid Bone
Perpendicular Plate
- A flat plate that descends from the cribriform plate to form part of the nasal septum.
- It articulates with the vomer inferiorly.
Cribriform Plate
- A horizontal bone that forms the superior surface of the ethmoid.
- It contains numerous foramina for the olfactory nerve.
- The crista galli is a vertical plate that extends superiorly from the cribriform plate, providing attachment for the falx cerebri of the meninges.
- It is associated with a small foramen cecum.
Ethmoid Labyrinth
- The largest part of the ethmoid bone.
- It descends inferiorly from the cribriform plate.
- The ethmoid paranasal sinuses are located within the ethmoid labyrinth.
- The ethmoid labyrinth forms two major structures within the nasal cavity:
- Superior nasal concha.
- Middle nasal concha.
- The ethmoid bulla is a large elevation of bone located near the middle ethmoid paranasal sinuses.
- The uncinate process is a curved piece of bone.
- The hiatus semilunaris is located between the uncinate process and the ethmoid bulla.
Learn about the characteristics, parts, and functions of the ethmoid bone, including its role in forming the orbit, nasal cavity, and nasal septum.
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