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Questions and Answers
What bone is known as the 'keystone of the skull'?
Which of the following structures is associated with the occipital bone?
Which suture separates the parietal bones from the frontal bone?
Which of the following bones does NOT contribute to the skull?
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What is the function of the foramen magnum?
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Study Notes
Cranium (Cranial bones)
- The cranial bones form the cranial cavity.
- The Frontal bone makes up the forehead and includes the supraorbital margin, which creates the eye opening.
- The Frontal bone also contains the Frontal sinus, which is an air-filled cavity in the bone.
- The two parietal bones, located at the top and sides of the skull, meet at the sagittal suture and attach to the frontal bone through the squamous suture.
- The occipital bone forms the back and base of the skull, including the foramen magnum which is an opening that allows the spinal cord to connect to the brain.
- The external occipital protrubance is a bony bump, and the occipital condyle is a rounded projection that articulates with the first vertebra in the neck.
- The temporal bones, located on each side of the skull, include the mastoid process (behind the ear), and the petrous portion (which holds the auditory ossicles, the tiny bones of the middle ear).
- The temporal bones also contain the external auditory meatus, the opening of the ear canal, and the styloid process (a long thin projection).
- The temporal bones articulate with the frontal bones through the squamous suture.
- The sphenoid bone is known as the "keystone of the skull" because it connects to all the other cranial bones.
- The sphenoid bone is characterized by the sella turcica, which houses the pituitary gland, and the optic foramen, which allows the optic nerve to pass through the skull.
- The sphenoid bone also includes the sphenoid sinus, another air-filled cavity in the bone.
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Description
Test your knowledge on the cranial bones and their functions with this quiz. Learn about the frontal, parietal, occipital, and temporal bones, and their significance in the structure of the skull. Challenge yourself with questions about their features and anatomical locations.
