Friday, 4-222-Auditory System (Stephens) Flashcards
The dorsal and intermediate striae decussate in the upper medulla and ascend in the contralateral ___ which terminates upon neurons in the inferior colliculus
LL
Where does the LL terminate in the auditory system?
Inferior colliculus
As the ventral stria cross the ML, they form the trapezoid body. These fibers terminate bilaterally in the ___ which projects fibers to the inferior colliculus primarily through the ipsilateral LL.
Superior olivary nucleus
Fibers from the inferior colliculus project to the ___, which projects to the primary auditory cortex.
Medial geniculate body via the brachium of the inferior colliculus
The __ is located in the transverse and superior temporal gyri and has a general tonotpic organization according to high and low frequencies.
Primary auditory cortex
The auditory association cortex for the processing and integration of sounds is located in the __
Parieto-occipito-temporal association cortex and wernicke’s area
The __ directly links the auditory association area to Broca’s speech area in the frontal lobe
Superior longitudinal fasciculus
Neurons in the ___ give rise to most of the olivocochlear efferents, which exert inhibitory influences upon the organ of corti.
Lateral superior olivary nucleus
The ___ is important in localizing sounds
Medial superior olivary nucleus
A unilateral lesion of the cochlear nerve results in: ___
Ipsilateral complete deafness
A unilateral lesion of the central auditory pathway results in: ___
Bilateral dimunition of hearing which is more prominent in the contralateral ear
These structures include the LL, inferior colliculus and brachium, and medial geniculate body
A lesion of the __ results in conduction aphasia. It is characterized by severe impairment of repetition, difficulty in reading aloud (reading comprehension intact), marked paraphasia, severe anomia, and a normal auditory comprehension
Arcuate fasciculus (superior longitudinal fasciculus)
Lesions in the __ may result in an auditory agnosia characterized by an inability to comprehend auditory information. Spoken and written language as well as other sensory modalities may remain intact
Auditory association (Parieto-occipito-temporal) cortex
__ is characterized by the pts inability to comprehend the spoken or written word. Pts can speak quite fluently. However, their speech patterns demonstrate numerous word substitutions, neologisms, and a circumlocution of language that belies an underlying fundamental comprehension deficit
Wernicke’s aphasia
A conduction aphasia is due to a lesion of the __.
Superior longitudinal fasciculus
