Unit 14: Functional Neuroanatomy Flashcards
What is the purpsoe of association fibres?
Interconnects cerebral areas in the same hemisphere - all lobes on one side of the brain
White matter
What is the purpose of commisure fibres?
White matter
Connects regions in different cerebral hemispheres - cross midline - allows both hemispheres to act as one functional unit.
What is the purpose of projection fibres?
Descending and ascending tracts
Connect the cortex, brainstem, spinal cord
White matter tracts
What is the superior longitudinal fasciculus?
Compact in middle region - fibres span into frontal anterioyla and occipital posteriorly
Connects frontal, parietal, temporal and occipital
For the integration of sensory information.
Association fibres
What is the purpose of the arcuate fasciulus?
Subset of fibres in the superior longitudinal fasiculus
Connects language areas - brocas (frontal) and wernicks (temporal and parietal lobe) .
Allows comprehension and production of language (understand what we say and say what we understand)
Norm only found in dominant hemisphere (left side).
What language connections are in the non-dominant hemisphere?
Melody
Accents
Tone of voice
Gives us our unique form of voice and communication
What is the largest bundle of commissural fibres?
Corpus callosum - most connection are inhibitory
What is the corona radiata?
Converge into internal capsule
Made from white matter tracts as ascend and descend from cerebral cortex to brainstem
What is the inferior occipitofrontal fasiculus?
Association fibres
Connects the parietal/occipital lobe to the frontal lobe.
Role if language processing, goal oritentaed behaviour and visual switching tasks.
What is the uncinate fasciculus?
Association fibres
Connects the frontal and temporal lobes
Bidirectional
What are the two limbs of the internal capsule?
Anterior - seperates head of caudate from putamen and GP
Posterior - separates the thalamus from the putamen and GP.
What structures developed from the embryological diencephalon?
Thalamus
Hypothalamus
Subthalamus
What structures derived from the embryological telencephalon?
Cerebral hemispheres
Deep structures
What is meant by a primary cortical area?
Areas that receive information from peripheral receptors (e.g thalamus), with little interpretation of the meaning of the information
These areas are concerned with receiving sensory information or executing motor tasks
M1. S1, V1 etc.
What is meant by an association area?
Recive input from primary cortical areas and areas involved in higher processing, integration and interpretation.
Normally adjacent to primary areas
Can be unimodal or heteromodal
Examples: visual association area, temporal association area.