Ear anatomy Flashcards
What part of which bone is the arrow pointing to?
Squamous part of the temporal bone
Which part of the temporal bone contains the structures of the inner and middle ear?
The petrous part
Which part of which bone is this arrow pointing to?
Petrous part of the temporal bone
What is the arrow pointing to?
Jugular foramen
There is a groove that site behind the jugular foramen. What is it for?
The sigmoid sinus
What is the main venous drainage channel for the brain?
The sigmoid sinus
What is the arrow pointing to? What runs through this?
The hypoglossal canal. The hypoglossal nerve
What travels through the internal auditroy meatus?
Vestibucochlear and facial nerves
External auditory meatus
What is the folded outer limb of the auricle called?
The helix
Tragus
What kind of cartilage in the auricle made up of?
Elastic
Where does the external auditory meatus end?
Tympanic membrane
External auditory meatus
Helix
Tympanic membrane
What part of the tympanic membrane is this showing?
Pars flaccida
Whta part of the tympanic membrane doe sthis image show?
Pars tense
What does this image show (be specific)
Handle of the malleus
Describe the path of lymph drainage from the right auricle
Parotid (pre auricular nodes)
Mastoid (post auricular) nodes
Deep cervical nodes
Thoracic duc or right lymphatic duct
Rigth venous angle
What is the most inwardly depressed part of the tympanic membrane called?
The umbo
What is this part of the tympanic membrane called and what attaches here?
The umbo. The handle of the malleus
What nerve gives sensory supply to the external surface of the tympanic membrane?
Trigeminal nerve (CNV)
Specifically, CNV3; the auriculotemporal branch
What nerve supplies the internal surface of the tympanic membrane?
Glossopharyngeal nerve (CN IX)
What two structures does the eustachian tube connect?
The tympanic cavity to the lateral wall of the nasopharynx
What nerve supplies the middle ear cavity, the eustachian tube, nasopharynx, oropharynx and the tonsils?
Glossopharyngeal nerve
The handle of the malleus
Incus
Stapes
Eustachian/auditory tube
Eustachian tube
Eustachian tube
Is the eustachian tube normally open or closed?
Closed. It opens monentarily when we swallow
What is the arrow pointing to and what bone sits here?
The oval window. The base of the stapes
What kind of joints are between the ossicles?
Synovial joints
Where does the oval window lead to?
The internal ear
What cavity does the eustachian tube arise from?
Middle ear cavity
The round window
What is this and what nerve runs through it?
Facial canal. Facial nerve
Mastoid air cells
What is teh function of the aditus?
A doorway into the right mastoid antrum from the epitympanic recess
What part of which bone does this show?
Mastoid process of the right temporal bone
Stapes
What is the smallest bone in the body?
Stapes
Tendon of stapedius
Incus
Malleus (handle)
What muscle restrains movement of the stapes?
Stapedius
What muscle restrains movement of the malleus
Tensor tympani
Tendon of the tensor tympani muscle
Which nerve is this?
Corda tympani
What nerve is the chorda tympani a branch of?
Facial nerve
What is the central chamber of the bony labyrinth of the internal ear called?
The vestibule
What nerve supplies most of the internal ear?
The Vestibulocochlear nerve (CN VIII)
What is perilymph?
A fluid that fills the bony labyrinth. The membranous labyrinth floats in ths.
How many sense organs are there for balance. Where are they all?
2 are in the vestibule
1 in each of the three semi circular canals (in the ampulla)
What fluid lies inside the membranous labyrinth?
Endolymph
What are the semi circular ducts?
Inter linked balloon like structures within the semi circular canals filled with endolymph
What nerve conducts action potentials fromm the semicircular ducts?
Vestibular nerve
What nerve conducts APs to the brainstem from the cochlear duct?
Cochlear nerve
Where do cranial nerve 7 (facial) and 8 (vestibulocochlear) connect with the brainstem?
The junction netween the pons and the medulla oblongata
What does the chorda tympani nerve supply?
Taste buds on anterior tongue
Parasympathetic supply to submandibular and sublingual salivary glands
What does the facial canal connect?
The internal acoustic meatus to the stylomastoid foramen
What nerves are these?
Facial nerves
Whereabouts does the facial nerve divide into the somatic motor branches for the muscles of facial expression?
Within the parotid salivary gland
What does the middle ear communicate with superiorly?
The mastoid air cells
What nerve lies across the medial wall of the middle ear cavity?
Facial
