Auditory and Visual Pathways Flashcards
Superior to the cochlear nuclei, some fibres are crossed and some are not. What is the significance of this?
Input above this level is essentially bilateral
What two nuclei are important in sound localisation and as relays for the stapedial and tensor tympani reflexes?
Superior olivatory nucleus and nucleus of lateral lemniscus
Describe where the primary auditory cortex would be found?
In the superior temporal lobe (just under the lateral fissure)
Fibres carrying what frequency of sound end in the anterolateral part of the auditory cortex?
Low frequency
Fibres carrying what frequency of sound end in the posteromedial part of the auditory cortex?
High frequency
‘Patients have difficulty in producing language; often using few words and only saying the most important words in a sentence’ describes which type of aphasia?
Broca’s (or expressive)
Do patients with Broca’s (expressive) aphasia have difficulty understanding language?
No
‘Patients have difficulty understanding language which can manifest as out of order words or meaningless words’ describes which type of aphasia?
Wernicke’s (or receptive)
Where is the primary visual cortex located?
In the occipital lobe
What structure separates the upper and lower gyri in the occipital lobe where the upper and lower visual fields are projected?
The calcarine sulcus
What area of the brain is responsible for eye movements in response to visual stimuli, i.e. tracking moving objects?
The visual cortex
What area of the brain is responsible for eye movements ‘of command’? I.e. independent of moving visual stimuli?
The frontal eye fields
Which type of eye movements tend to be a) smooth? b) jumpy?
a) Tracking movements b) movements of command
In the pupillary light reflex, what happens to the a) right pupil and b) left pupil, when you shine light into the right eye?
a) Constricts b) Constricts
A lesion of the optic nerve will cause what visual field defect?
Ipsilateral monocular blindness
