Assignment 3

Maria Traxler Assignment 3 1.) What is the purpose of the Stria Vascularis? It serves as a pump for transporting electrically charged ions into endolymph, the cochlear fluid in the scala media. 2.) A recordable signal that may arise from the cochlea in response to a received signal and travel back toward the eardrum is known as a a. Transient-evoked otoacoustic emissions b. Signal-evoked otoacoustic emissions c. Laterally-received otoacoustic emissions d. Reversed otoacoustic emissions 3.) T/ F: When activated, inner hair cells alternatively become longer and skinnier and then shorter and fatter, which increases basilar membrane motion with sound stimulation and contributes importantly normal hearing. 4.) Disturbance of the vestibular mechanism often results in the sensation of true turning called _ Vertigo ___. It is associated with rapid eye movements called __ nystagmus ____. 5.) T/ F: In contrast to the vestibular nerve, the auditory nerves are distinguished by a very high rate of spontaneous activity. 6.) Frequency discrimination is enhanced when the fluid-borne wave within the cochlea is “sharpened” through assistance of the a. Inner hair cells b. Otoacoustic emissions c. Displacement of perilymph. d. Outer hair cells 7.) The basilar membrane supports the _ organ of corti _____, while Reisner’s membrane separates the scala vestibuli from the _ Scala media _____. 8.) Noise-inducted hearing loss is generally caused by damage to the _ Hair cells __ and frequently results in a notch in the _ 4000-6000 __ Hz range on the audiogram. 9.) The majority of congenitally inherited hearing loss is

a. Autosomal recessive b. Dominant c. X-linked d. Hereditodegenerative 10.) A hearing loss due to aging that is associated with loss of outer hair cells and supporting cells in the basal turn of the cochlea is called a. Sensory presbycusis b. Neural presbycusis c. Strial presbycusis d. Cochlear conductive presbycusis 11.) T/ F: High in sodium (Na+) ions and low in potassium (K+) ions, Perilymph is very similar in composition to the cerebrospinal fluid that surrounds the spinal cord the brain. 12.) The __ cupula ______ , a gelatinous structure that enhances movement of the hair cells in the crista with movement of the head. 13.) The organ of Corti a. Is the end organ for balance b. Is the receptor organ for hearing c. Rests on Reisner’s membrane d. Aids in human proprioception e. A and C f. B and C - g. All of the above 14.) Three to five parallel rows of outer hair cells and one row of inner hair cells are situated on a. Reisner’s membrane b. Corti’s arch. c. Basilar membrane - d. Tectorial membrane 15.) Drugs taken by the patient that produce hearing loss are called _ oxytoxic drug _____ and typically affect __ high-frequency _____ frequency hearing. 16.) T/F: The saccule and utricle detect movement in a straight line and also the force of gravity. The utricle is responsible for detecting vertical and horizonal acceleration.