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Hearing Science 410

Based off of CSUN CD410 first test, embryology, and ear parts

QuestionAnswer
From slide one label 1-7 1. Crura(antihelix)2. triangular fossa 3. Cymba 4. anterior notch 5. external auditory meatus 6. cavum 7. tragus
From slide one (the pinna) label 8-14 8. intertraqual notch 9. lobule 10.antitraqus 11.antihelix 12.Antihelical fold 13. Scaphoid Fossa 14. helix
What is the cavum and the cymba parts of? The concha of the pinna
What happens to (the embryo)that is important for the inner and the middle ear at 3 weeks? The inner ear has somites develop the middle ear has the tubo tympanic recess begin
What happens to the embryo at 4 weeks that is important to the inner ear? otic cyst and the branchial arches and grooves start to develope
What happens to the embryo at 5 weeks that is important for the outer ear? The external canal begins to form
What happens to the embryo in the 6th week that is important to Inner ear Outer ear Inner- vestibular organs form Outer- 6 hillocks appear 3 on the mandible and 3 on the hyiod - these become the pinna
What happens to the embryo at 7 weeks that is important to the inner ear? 1st coil of the cochlea
What important happens to the fetus at 8 weeks that is important to the middle ear the outer ear Middle- lower half of tympanic cavity is formed by extended tubotympanic recess Migrating cells from 1st arch reach tympanic cavity and form incus and malleus Outer- Lateral cartilaginous 1/3 of canal is formed
What happens to the fetus at the 9th week that is important to the middle ear? The 3 layers of tympanic membrane form the layers are mucus membrane, connective tissue, and skin
What happens to the fetus in the 11th week that is important to the inner ear? Cochlea lengthens to 35 mm and is 2 5/8 turns the VIII cranial nerve (hearing nerve) attaches to cochlea
what happens to the fetus in the 12th week that is important in the inner ear? sensory cells appear in cochlea otic capsule begin to ossify
What happens in the 20th week that is important to the inner ear outer ear inner ear- sensory and supporting cells formed inner ear hearing is functional outer- pinna completes
What happens in the 21st week that is important to the middle ear? meatal plug disintegrates showing tympanic membrane
What happens in the 32nd week that is important to the middle ear? malleus and incus complete ossification
what happens to the fetus in week 34 that is important to the middle ear? mastoid air cells develop connected to the middle ear
what happens around 2 years of age the is in relation to the development of the ear? The TM becomes vertical
What is a zygote a fertilized egg- 24 hrs till 72 hrs
What does the blasto-pore become? anus
What week does the branchial arches and grooves show? how many are there week 4 and 5
Which branchial arches are important to the ear? what do they become The 1st arch becomes 2 bones in the middle ear the 2nd arch becomes part of larynx
what are the 4 devisions of the temporal bone? Squamas, mastoid, tympanic, and petrous
What are the 4 articulations of the temporal bone? occipital, parietal, sphenoid, and zygomatic
Where is the squamas located? It is the flat area above the ear ( thin and hard)
Where is the mastoid located? It is behind and below the ear canal.
Where is the tympanic division of the Temporal bone located? front wall, floor and back wall of ear canal. It is the inner 2/3 of the ear canal
Where is the petrous located? It can not be seen from outside. It is on the ridge between the middle and posterior fossa
at what angle is the pinna extended from the head 30 degrees
what can surgeons use the ear lobe for? bandages- is good fat to bandage wounds with
what is cerumen? Ear wax
where is the ear canal the widest? The narrowest? Widest- junction of cartilage and bone Narrowest at TM
The ear canal is how long and has what shape? 2.5mm and is in a lazy s shape
What are the 4 contributions of the outer ear? 1. sound location (aka pinna focusing)but this is freq specific. you gain 3 dB of sound from 3000-6000 Hz 2. Resonance 3. localization 4. protection of the middle ear
How many inches are ear separated by? what does this help with? 8 inches and it helps localization
The middle ear- what is its volume? 2cc
what is on the lateral surface of the middle ear? The TM (tympanic membrane)
What are features of the TM? 1. umbo 2. Pars flaccida 3. Pars Tensa 4. Cone of light
What is on the superior surface of the middle ear? Tegman Tympani
What is the inferior surface of the middle ear? Separates the tympanum from the jugular fossa.
What possible tumor could erode the tympanum floor? what are symptoms? Glomus Jugulare symptoms are to hear woosh sounds and that it is blue behind the TM
What does the anterior wall of the middle ear do? What is on the anterior wall? Separates the tympanum from the carotid canal. The musculo- tubal canal is in the lower part of the wall- for opening the eustachian tubes
What are the features of the Posterior wall of the middle ear? the stapedius muscle(smallest we have) and the Aditus- the opening to the antrum of the mastoid
What are the features of the medial wall of the middle ear? The oval window- 3.2 sq mm the round window- 2.3 sq mm canal for the VII nerve (facial nerve) Promontory- bony accommodation for the lateral semicircular canal and base of cochlea
what are the parts of the ossicular chain? malleus incus Stapes
what are the features of the malleus? 1. head 2. neck 3. manubrium 4. anterior proces
what are the features of the incus? 1. articulating facet 2. long process 3. lenticular process (right angle) 4. posterior process
what are he features of the stapes? 1. head 2. neck 3. crura -anterior and posterior 4. footplate
What type of joint does the malleus and incus have? ball and socket
What type of joint does the incus and stapes have? hinged
what muscles attach to the ossicular chain tensor tympani- to the neck of the manubrium 25 mm tendon pulls malleus anteriorly and medially Stapedial muscle- to the neck of the stapes 6mm pulls posteriorly
eustachian tube goes from where to where? The carotid wall aka anterior inferior to the musculo- tubal canal goes to the naso-pharynx
How long is the eustachian tube? Adult 35- 36mm is at a 45 degree angle Infant 17-18 mm
What lines everything in the middle ear? Mucosa or mucus membrane
what are the names of the hairs in the Eustachian tube? cilia
what are the 4 major sections of the eustachian tube? Osseous- from carotid wall for 16mm Isthmus- about 1mm where bone meets cartilage Cartilaginous- 12-25 mm long Membranous- 4 -5 mm long ends at toros tubarius in nasopharynx
what 2 muscles open the eustachian tube? tensor veli palatini- primary Levator vili palatini- secondary
What is the gain of the areal ratio function in the middle ear? 27dB
The areal ratio is a result of? the difference in surface area of the pars tensa 55 mm^2 and the oval window 2.3 mm ^2
What is the spot of the superior surface of the middle ear called that accommodates the malleus? Epitympanic recess
The development of the pinna stats with- 6 hillocks- 3 on the hyoid arch and 3 on the madibular arch in the 6th week
The arcuate eminence is in which temporal division Petrous
Created by: Andrea_trihub