ENT Flashcards
what are the three parts of the ear and their function
outer - collects soundwaves and moves towards middle ear
middle - conducts and amplifies vibrations
inner - coverts vibrations/movement of fluids into action potentials
what is the eustachian tube
a tube than connects the middle ear to the nasopharynx
what are the two part of the cranium split into
neurocranium - surrounds brain
viscerocranium - surrounds face
describe a pterion
H shaped region where the frontal, temporal, parietal and sphenoid all join together on lateral aspect of the face
what is the function of the paranasal sinuses
reduce weight of the skull
assist with resonance of the voice
list the 4 paranasal sinuses
ethmoidal, frontal, sphenoid and maxillary
name the 2 parts the external ear is divided into
auricle/pinna - projecting from outside of ear
external acoustic meatus
which two nerves supply the outer auricle and where abouts
greater auricular nerve - supplies all anterior and posterior inferior sections
lesser occipital nerve - supplies posterosuperior section
which 2 spinal nerves form the greater auricular and lesser occipital nerve
C2,3
where does the auriculotemporal nerve supply and which CN is it derived from
supplies the superior/medial part of the auricle (above the tragus) derived from CN V3
which two main arteries supply the auricle
external carotid supplies posterior auricular artery
superficial temporal artery supplies anterior auricular branches
what are the borders of the external acoustic meatus
tympanic membrane to the deepest part of the concha
what is the tympanic membrane made up of
connective tissue core with skin on the outside and mucous membrane on the inside
which part of the tympanic membrane does the handle of malleus attach to
umbo
name the ossicles from lateral to medial
malleus, incus and stapes
