anatomy of the ear Flashcards
which cranial nerves supply the greater and lesser occiptal parts of the ear?
CN II and III
optic and oculomotor
what cranial nerve supplies the tragus and anterior wall of external acoustic meatus and tympanic membrane?
CN V3
trigeminal nerve branch 3 - auriculotemporal
what cranial nerve supplies the floor of concha (speckled across)?
CN VII
facial nerve
what cranial nerve supplies the inferior wall of external acoustic meatus and tympanic membrane?
CN X
vagus nerve - auricular branch
what cranial nerve supplies the internal surface of tympanic membrane?
CN IX
glossopharyngeal nerve
what are the three ossicles of middle ear?
malleus -> incus -> stapes
what are the 3 ossicles connected by?
synovial joints
what skeletal muscles keep the malleus ossicle in place?
tensor tympani muscle
what skeletal muscle keeps pyramidal eminence and stapes ossicle in place?
stapedius tendon
what connects the anterior wall of middle ear cavity to nasopharynx?
eustachian tube
what is the role of eustachian tube?
equalise pressure
what cranial nerve supplies nasopharynx/oropharynx?
CN IX
glossopharyngeal nerve
what cranial nerve supplies the laryngopharynx?
CN X
vagus nerve
what cranial nerve supplies the inner ear?
CN VIII
vestibulocochlear
what is the function of the cochlea?
hearing
what is the function of saccule and utricle?
balance
what is the function of the 3 semi-circular canals?
balance
where is the oval window located?
stapes
what is the oval window?
opening in middle ear - connective tissue membrane-covered opening from middle ear to cochlea of inner ear
what is the role of the oval window?
transmits sound vibrations to the inner ear
what is in the middle of cochlea?
modiolus bone
what type of pitch will it be if vibration is closer to oval window?
high pitch
what type of pitch will it be if the vibration is further from round spiral?
low pitch
what is the role of the round window?
dissipates sound, stopping it from reflecting back
