SLHS 305- Test 1 Questions and Answers Fully Solved
structures of outer ear - Answers -pinna
-concha
-external auditory meatus
-external auditory canal
pinna - Answers primarily made of cartilage
concha - Answers deep center portion
external auditory meatus - Answers opening to external ear canal
external auditory canal - Answers about 2-3 cm in length
-1st 1/3 of canal is CARTILAGINOUS w/glands & hair follicles
-final 2/3 of ear canal is BONY
function of outer ear - Answers 1) pinna collects auditory stimuli (sound) from environment and funnels
it into ear canal
2) sound localization using 2 ears (interaural level AND time differences)
3) protection for tympanic membrane (protects things from getting in/crawling in)
Structures of middle ear - Answers Tympanic membrane
tympanic membrane - Answers **eardrum**
-most lateral portion of middle ear
-cone-shaped, pearl-white color
3 landmarks of tympanic membrane - Answers 1. pars flaccida (superior, WEAK FIBERS, loosest, see
most of motion here)
2. pars tensa (most of surface area of TM, lower portion, more tense, STRONGER FIBERS, less
movement)
3. umbo (greatest point of retraction/concavity, deepest portion of middle ear)
Middle ear ossicles - Answers -malleus
-incus
-stapes
, malleus - Answers manubrium of malleus is embedded in tympanic membrane
*most lateral
incus - Answers short process and a long inferior process
*medial
stapes - Answers smallest bone in body
-footplate of stapes is most medial portion of middle ear
lenticular process - Answers on incus
-leads into stapes
stapes footplate - Answers most medial portion of middle ear
*short process of incus connects to head of malleus
middle ear muscles - Answers -tensor tympani
-stapedius
tensor tympani - Answers inserts into manubrium of the malleus
-does stuff for outside of middle ear
stapedius - Answers inserts into posterior portion of neck of stapes
-does stuff for median middle ear
eustachian tube - Answers -most inferior portion of middle ear cavity
-equalizes pressure b/w middle ear cavity and external auditory canal
*connected to throat
*chewing gum opens and closes the eustachian tube
function of middle ear - Answers -converts acoustic energy into mechanical energy (movement) by using
lever action of ossicular chain
-tympanic membrane & ossicular chain increase pressure in order to displace the fluids of inner ear (bc
of higher impedance of inner ear fluid)
structures of inner ear - Answers -semicircular canals
structures of outer ear - Answers -pinna
-concha
-external auditory meatus
-external auditory canal
pinna - Answers primarily made of cartilage
concha - Answers deep center portion
external auditory meatus - Answers opening to external ear canal
external auditory canal - Answers about 2-3 cm in length
-1st 1/3 of canal is CARTILAGINOUS w/glands & hair follicles
-final 2/3 of ear canal is BONY
function of outer ear - Answers 1) pinna collects auditory stimuli (sound) from environment and funnels
it into ear canal
2) sound localization using 2 ears (interaural level AND time differences)
3) protection for tympanic membrane (protects things from getting in/crawling in)
Structures of middle ear - Answers Tympanic membrane
tympanic membrane - Answers **eardrum**
-most lateral portion of middle ear
-cone-shaped, pearl-white color
3 landmarks of tympanic membrane - Answers 1. pars flaccida (superior, WEAK FIBERS, loosest, see
most of motion here)
2. pars tensa (most of surface area of TM, lower portion, more tense, STRONGER FIBERS, less
movement)
3. umbo (greatest point of retraction/concavity, deepest portion of middle ear)
Middle ear ossicles - Answers -malleus
-incus
-stapes
, malleus - Answers manubrium of malleus is embedded in tympanic membrane
*most lateral
incus - Answers short process and a long inferior process
*medial
stapes - Answers smallest bone in body
-footplate of stapes is most medial portion of middle ear
lenticular process - Answers on incus
-leads into stapes
stapes footplate - Answers most medial portion of middle ear
*short process of incus connects to head of malleus
middle ear muscles - Answers -tensor tympani
-stapedius
tensor tympani - Answers inserts into manubrium of the malleus
-does stuff for outside of middle ear
stapedius - Answers inserts into posterior portion of neck of stapes
-does stuff for median middle ear
eustachian tube - Answers -most inferior portion of middle ear cavity
-equalizes pressure b/w middle ear cavity and external auditory canal
*connected to throat
*chewing gum opens and closes the eustachian tube
function of middle ear - Answers -converts acoustic energy into mechanical energy (movement) by using
lever action of ossicular chain
-tympanic membrane & ossicular chain increase pressure in order to displace the fluids of inner ear (bc
of higher impedance of inner ear fluid)
structures of inner ear - Answers -semicircular canals
