External and middle ear Flashcards
most of the ear is found in what bone
petrous part of the temporal bone
what forms the boundary between the external and middle ear
tympanic membrane
what is the external ear (outer)
auricle, external auditory meatus, external surface of the tympanic membrane
what is the middle ear
internal surface of the tympanic membrane, tympanic cavity, ossicles, pharyngotympanic tube
what is the internal ear
auditory apparatus, vestibular apparatus, internal auditory meatus, vestibulocochlear nerve (CN VIII), oval window, round window
what vessel and nerve are anterior to the external ear
superficial temporal vessels and auriculotemporal nerve
the middle ear is related to what artery
ICA
the internal ear is surrounded by bone between which 2 cranial fossae
between middle and posterior cranial fossae
what brain lobes sit superior to the internal structures of the ear
temporal lobes of the brain
the internal acoustic meatus carries what 2 nerves
facial and vestibulocochlear
what is the function of the auricle
catch sound waves and funnel them towards the EAM
some people can wiggle their ears - what nerve innervates the muscles that control this
facial nerve
what are the 2 parts of the concha of the ear
cymba - superior, infront of anti-helix
cavity - behind tragus, inferior
what is the ear made of
elastic cartilage
where does lymph from the auricle drain
parotid and cervical lymph nodes
the auricle is supplied by branches of what blood vessel
external carotid artery
what branches of the ECA supply the auricle
posterior and anterior auricular and perforating branches
- blood drains to corresponding veins and into the external and internal jugular veins
what supplies innervation to the face anterior to the auricle
auriculotemporal nerve from CN V3
what supplies innervation to the cavity of the concha of the auricle
CN IX and CN X
what supplies innervation to the border of the auricle (lobe, helix) and skin of head behind the auricle
lesser occipital and great auricular nerves (cervical plexus)
what supplies innervation to the inner parts of the auricle (not the concha, bits around that) and the skin on posterior aspect of auricle
CN VII
where does the external auditory meatus run from
opening in the auricle into the petrous temporal bone to end at the tympanic membrane
the lateral 1/3 of the EAM is made of what
elastic cartilage, hair follicles, sweat and sebaceous glands
what are the medial 2/3 of the EAM made of
bone lined with stratified squamous epithelium
blood supply to the EAM is from
ECA - auricular
what supplies innervation to the EAM
mainly auriculo-temporal from CN V3 but also auricular branches from CN VII and CN X
what 3 cranial nerves supply innervation to the EAM
CN V3
CN VII
CN X
what ossicle attaches to the tympanic membrane
malleus
how is sound transmitted from a wave to a physical movement
sound waves move the tympanic membrane which moves the malleus in the middle ear
what is the lining of the outer tympanic membrane
stratified squamous epithelium
what is the inner lining of the tympanic membrane
mucous membrane
what nerve runs along the medial surface of the tympanic membrane
chorda tympani
what nerve supplies innervation to the lateral surface of the tympanic membrane
auriculotemporal nerve CN V3 and auricular branch of vagus
what nerve supplies innervation to the medial surface of the middle ear
tympanic branches of glossopharyngeal CN IX
the medial surface of the tympanic membrane bulges into a space inside the petrous temporal bone called what
tympanic cavity