auditory lec 1 Flashcards
Is the temporal bone part of the neurocranium or viscerocranium?
neurocranium
Is the temporal bone inferior or superior to the parietal bone?
inferior
Is the temporal bone anterior or posterior to the occipital bone?
anterior
what are the parts of the squamous segment? (4)
- zygomatic process (cheek bone part)
- temporalis muscle
- masseter muscle (jaw clench)
- mandibular fossa (where jaw bone tucks into)
what are the parts of the tympanic segment? (3)
- supports external auditory canal
- styloid process (sharp, deep in neck)
- attaches stylohyoid (muscle that pulls throat up)
what is the mastoid segment? what does it do when vibration is placed on it?
- giant bone behind ear
- vibrates ossicles
what does the petrous segment contain? (3)
- cochlea
- vestibular structures
- internal acoustic meatus (lets thru cranial nerves 7 and 8)
The mandibular fossa is on which part?
squamous (jaw bone)
the zygomatic process is on which part of the temporal bone?
squamous (cheek bone)
The internal acoustic meatus is on which part?
petrous
the styloid process is on which part of the temporal bone?
tympanic
what are the parts of the outer ear? (2)
- pinna
- ear canal (EAM/EAC)
what is the border of outer and middle ear?
tympanic membrane
what are the parts of the middle ear?
ossicles
what are the parts of the inner ear? (1) is there anything more medial?
- cochlea (contains nerve endings that convert acoustic + mechanical energy into nerve signals)
- only thing more medial is auditory nerve
what are the parts of the vestibular system? what does it do?
- parts: 3 semicircular canals
- function: provides info on balance and orientation
T or F: the pinna is fully developed in utero
true
what is the external auditory canal composed of?
- 1/3 cartilage, 2/3 bone
what are the 4 ways the external auditory canal is protected?
- s-shaped/air filled
- epidermal lining
- hair follicles
- cerumen-producing glands
the tympanic membrane is ___ shaped and the max peak is the ___
concave, umbo
what are the 2 main parts of the tympanic membrane?
- pars tensa (largest)
- pars flaccida (much smaller)
T or F: the tympanic membrane is opaque
false – translucent
how can you tell if you’re looking at a left or right ear drum?
- right: malleus angled toward 1, cone of light at 5
- left: malleus angled toward 11, cone of light at 7
T or F: ear tubes stay inside the ears forever
false – fall out after 4-18 months
T or F: ear tubes cause severe conductive hearing loss
false – mild conductive hearing loss (3-4dB)
