Anatomy: The Ear Flashcards
What is the pterion?
an H shaped suture on the lateral aspect of the skull
What are the two parts of the temporal bone?
The petrous and squamous part
The petrous part of the temporal bone contains what three important structures.
the organs of hearing and balance
the facial nerve
the vestibulocochlear nerve
What type of cartilage is in the external ear
elastic
What glands are contained within the ear canal and produce wax
ceruminous glands
What nerve supplies (sensory) the superior part of the EAM and most of the tympanic membrane
V3
What nerve supplies (sensory) to the inferior part of the EAM and tympanic membrane
vagus
What is the name of the thin part of the tympanic membrane superiorly?
Pars flaccida (superiorly)
What is the most inwardly depressed part of the tympanic membrane?
the umbo
What is the name of the thick part of the tympanic membrane
the pars tensa (posteroinferiorly)
Where is the cone of light normally directed in an otoscopic examination
anteroinferiorly
What supplies the sensory nerve supply to the external surface of the tympanic membrane
V3 (auriculotemporal branch of the trigeminal nerve)
what gives the sensory nerve supply to the internal surface of the tympanic membrane
glossopharyngeal nerve
What supplies the middle ear, eustachian tube, nasopharynx, oropharynx and tonsils with sensory innervation
glossopharyngeal (IX)
What tonsil is in the roof of the nasopharynx
pharyngeal
what tonsil is in the lateral wall of the oropharynx
palatine
What gives sensory supply to the laryngo pharynx
vagus
What is the function of the Eustachian tube
connects the middle ear cavity to the nasopharynx
what is the promontoryq
bony swelling on the medial wall of the middle ear cavity formed by the cochlea of the internal ear
what is the aditus
doorway into the right mastoid antrun from the epitympanic recess
what is the name of the space inside the otic capsule
the bony labyrinth
what is the name of the apex of the spiral of the cochlea
the cupula
what is the name of the fluid contained in the bony labyrinth
perilymph
what is the name of the fluid within the semicircular and cochear ducts
endolymph
what nerves are in the internal acoustic meatus
the vestibulocochlear nerve ( made up of the vestibular and cochlear nerve) and the facial nerve
what nerve supplies tast buds at the anterior two thirds of the tongue
chorda tympani (branch of VII)
what else does the chorda tympahny supply
the parasympathetic supply to the submandibular and sublingual salivary glands
what is the function of the tensor tympani?
skeletal muscle which pulls on the handle of the malleus
what is the function of the stapedius muscle
reduces stapes movement to protect the internal ear from excess noise
what supplies the tensor typani (nerve
V3
what nerve supplies the stapedius
VII
where does the facial nerve divide
parotid salivary gland
what can be caused due to pathology of CN VII
ipsilateral loss of facial expression or taste
dry mouth
reduced general sensation in the auricle
what can be caused by pathology of CN VIII
ipsilateral loss of hearing and/or balance
