Auditory System (Stephens)

Question 1

connections of the cochlear nuclei

Answer 1

dorsal and intermediate acoustic striae

ventral acoustic stria

Question 2

dorsal and intermediate acoustic striae pathway

Answer 2

decussate in upper medulla, ascend in contralateral lateral lemnisccus—>term neurons inferior colliculus–>brachiam of inferior colliculus–>medial geniculate body–> primary auditory cortex (via auditory radiations)

Question 3

ventral acoustic stria pathway

Answer 3

cross medial lemniscus and form trapezoid body
-fibers terminate bilaterally in superior olivary nucleus–>inferior colliculus (primarily through ipsilateral lateral lemniscus)

Question 4

location of primary auditory cortex

Answer 4

located in:

transverse and superior temporal gyri

Question 5

what links brocas and wernickes area and lesion causes what

Answer 5

superior longitudinal fasciculus (arcuate fasciculus)

-compromised in conduction aphasia

Question 6

what signs are found in conduction aphasia

Answer 6

right hemiparesis and hemianopia as well as orofacial and bilateral limb apraxia

Question 7

medial superior olivary nucleus fnct

Answer 7

important in localizing sounds

Question 8

lateral superior olivary nucleus function

Answer 8

olivocochlear effernts, exert inhibitory influence upon organ of corti

Question 9

superior olivary fibers path

name of crossing over area

Answer 9

peripherally pass through vestibular division and cross over to the cochlear division via the vestibulocochlear anastomosis (OORT)?

Question 10

unilateral lesion of the cochlear nerve results

Answer 10

in ipsilateral complete deafness

Question 11

unilateral lesion of central auditory pathway

• structures
• result

Answer 11

lateral lemniscus, inferior colliculus and brachium, medial geniculate body

-bilateral diminution of hearing, more loss on contralateral side

Question 12

auditory agnosia

• lesion location
• result

Answer 12

lesion in auditory association cortex (POT)

-inability to comprehend auditory info but can spoken and written language may remain intact

Question 13

wernicke’s aphasia

• another name
• result

Answer 13

fluent paragrammatical aphasia

• patients inability to comprehend the spken or written word
• patients can speak a lot but may not make sense

Question 14

what is hemiparesis

Answer 14

complete weakness of one side of body

Question 15

what is hemianopia

Answer 15

blindness over half field of vision

Question 16

what is orofacial and bilateral limb apraxia

Answer 16

difficulty in motor task with limbs and face