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Questions and Answers
Which bone contains the crista galli and superior nasal conchae?
What is the function of the crista galli?
Where is the sella turcica located?
Which bone forms part of the roof of the nasal cavity and the greater part of the anterior cranial fossa?
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Where are the supraorbital foramen located?
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Which bone consists of two lesser wings, two greater wings, and two pterygoid processes?
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What is the location of the crista galli?
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Which bones have convex external surfaces and concave internal surfaces?
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What is located in the center of the supraorbital margin of the frontal bone?
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Which bone has a vertical plate and a horizontal plate?
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What is the purpose of the cranial bones?
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Which joint is found between the frontal and parietal bones?
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Where is the lambdoidal suture located?
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What is the function of the sphenoidal fontanel?
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Which area of incomplete ossification is located at the point labeled lambda?
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In what part of the cranium are the ethmoid and sphenoid bones located?
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What landmark is described as the smooth elevation between the superciliary ridges?
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Which bone articulates with the right and left parietals, sphenoid, and ethmoid bones of the cranium?
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What are ASTERION and BREGMA junctions of in relation to cranial bones?
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Study Notes
Cranial Bone Structure and Function
- The crista galli and superior nasal conchae are found in the ethmoid bone.
- The crista galli serves as an attachment point for the falx cerebri, a membrane that separates the two cerebral hemispheres.
- The sella turcica is located on the sphenoid bone, housing the pituitary gland.
- The frontal bone contributes to both the roof of the nasal cavity and the anterior cranial fossa.
- Supraorbital foramina are situated above the orbits in the frontal bone, allowing the passage of nerves and blood vessels.
- The sphenoid bone consists of two lesser wings, two greater wings, and two pterygoid processes, forming a critical region of the skull base.
- The crista galli is positioned in the midline of the ethmoid bone, projecting upwards into the cranial cavity.
- The parietal bones have convex external surfaces and concave internal surfaces, contributing to the lateral aspects of the skull.
- The supraorbital margin of the frontal bone features a notch or foramen at its center for neurovascular structures.
- The palatine bone consists of a vertical plate and a horizontal plate, helping form the posterior part of the hard palate.
- Cranial bones serve to protect the brain, support the structures of the head, and act as attachment points for muscles.
- The suture between the frontal and parietal bones is known as the coronal suture.
- The lambdoidal suture is located at the posterior aspect of the skull, joining the occipital bone with the parietal bones.
- The sphenoidal fontanel allows for flexibility during birth and accommodates brain growth during infancy.
- The area labeled lambda refers to the lambdoid fontanel, where the parietal bones meet the occipital bone.
- The ethmoid and sphenoid bones are located in the middle cranial fossa, contributing to both the nasal cavity and orbit.
- The glabella is the smooth elevation between the superciliary ridges on the frontal bone.
- The occipital bone articulates with the right and left parietal bones, as well as the sphenoid and ethmoid bones.
- ASTERION and BREGMA are junctions of cranial bones, with Asterion marking the junction of the occipital, parietal, and temporal bones, and Bregma being where the frontal and parietal bones meet.
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Description
This quiz covers the radiographic positioning procedures for finals and the radiologic skull, including the separate bones, cranial and facial bone groups, cranium development, and fibrous joints called sutures.
