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Questions and Answers
What structure is labeled as '29' on the axial MR image of the brain?
In the sagittal T1 Wtd MRI section at the level of Thalamus, what structure is labeled as '33'?
What is labeled as '42' in the sagittal T1 Wtd MRI section at the level of Body of Corpus Callosum?
What structure is labeled as '46' in the sagittal T1 Wtd MRI section above the Corpus Callosum?
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What does structure '30' represent on the axial MR image of the brain?
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Which structure is labeled as '38' on the sagittal T1 Wtd MRI section at the level of Corpus Callosum?
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What does structure '35' represent on the axial MR image of the brain?
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Which structure is labeled as '41' in the sagittal T1 Wtd MRI section at the level of Body of Corpus Callosum?
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What does structure '37' represent on the axial MR image of the brain?
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What is labeled as '40' in the sagittal T1 Wtd MRI section at the level of Corpus Callosum?
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Study Notes
Skull Anatomy
- The skull is composed of 22 bones: 8 cranial bones and 14 facial bones.
Cranial Bones
- The 8 cranial bones are: frontal, 2 parietal bones, occipital, 2 temporal bones, sphenoid, and ethmoid bones.
- The frontal bone forms part of the roof of the orbital cavities and contains two hollow spaces (sinuses) that communicate with the nasal cavities.
- The parietal bones form the sides of the vault and articulate with each other at the sagittal suture.
- The temporal bones lie on each side of the head below the parietal bones and contain the mastoid process, tympanic part, styloid process, and petrous part.
Facial Bones
- The 14 facial bones are: 2 maxillary bones, 2 zygomatic bones, 2 lacrimal bones, 2 nasal bones, 2 palatine bones, 2 inferior nasal conchae, 1 vomer, and 1 mandible.
- The nasal bones form the bridge of the nose and articulate with the frontal process of the maxillae.
- The vomer forms part of the nasal septum together with the perpendicular plate of the ethmoid bone.
Sutures and Landmarks
- The skull has several sutures: sagittal, frontal (coronal), squamous, and lambdoid.
- The skull has several landmarks: vertex, external occipital protuberance, external auditory meatus, outer canthus of the eye, infra-orbital point, nasion, and glabella.
Skull Views
- There are 5 skull views: lateral, anterior, superior, inferior, and frontal.
Radiographic Positioning
- The skull is positioned using several lines: the anthropological line, the orbital-meatal line, and the isometric "baseline".
- The correct positioning of the skull is important for radiographic imaging.
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Description
Test your knowledge of the anatomy of the skull with this quiz on the lateral and superior views of various bones, including the sphenoid, occipital, mastoid process, and more.
