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CT/MRI temporal bone
CT/MRI temporal bones
| Question | Answer |
|---|---|
| MRI primarily looks at: | nerves (7th & 8th cranial) |
| irregularly shaped bones on right and left side | temporal bone |
| Temporal bones must be parallel or perpendicular? | parallel |
| Numerous small intercommunicating cavities filled with air | mastoid air cells |
| Infection/fluid build up in the mastoid cells is termed: | mastoiditis |
| fibrocartilaginous auricle | external ear |
| another name for external ear | ear lobe |
| opening that forms canal to reach middle ear | external auditory meatus (EAM) |
| what does the middle ear consist of? | tympanic membrane (ear drum), tympanic cavity, auditory ossicles |
| transmits sound waves to ossicles | tympanic membrane |
| another name for the tympanic membrane? | ear drum |
| narrow air-filled cavity housing ossicles | tympanic cavity |
| vibrate the sound waves to the oval window | auditory ossicles |
| what are the auditory ossicles? (lateral to medial) | malleus, incus, stapes |
| what houses the essential components for hearing and equilibrium? | inner ear |
| 3 loops that form right angles to one another that control equilibrium and balance | semicircular canals |
| what are the semicircular canals lateral and inferior to? | cochlea |
| hearing, converts sound vibrations into nerve impulses | cochlea |
| what does the cochlea look like on an axial CT image | piece of broccoli or cauliflower |
| what does the cochlea look like on an MRI axial & coronal image? | a seashell |
| controls facial nerves & provides taste to 2/3 of the tongue | cranial nerve #7 |
| what 3 branches does cranial nerve #7 consist of? | temporal branch, zygomatic branch, and buccal branch |
| what is another name for cranial nerve #7? | facial nerve |
| consists of cochlear & vestibular nerves? | cranial nerve # 8 |
| another name for cranial nerve #8 | acoustic/vestibulocochlear |
| What carries information about hearing & attaches itself to the cochlea? | cochlear nerve |
| What carries information about balance & attaches itself to the semicircular canals? | vestibular nerve |
| a canal within the petrous part of the temporal bone of the skull between the posterior cranial fossa and the inner ear; the 7th and 8th cranial nerves also go through this | Internal Auditory Canal (IAC) |
| what is the slice thickness for CT/MRI temporal bones? | 1-3 mm |
| what planes are scanned in CT for temporal bones? | axial & coronal |
| What must the gantry be matched to for CT temporal bones? | internal auditory canals |
| What is used to image MRI IAC? | neurovascular & head coils (birdcage) |
Created by:
gnteumac
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