BIOL 6265 Lecture Notes - Lecture 4: Anterograde Amnesia, Basal Ganglia, Projection Fiber
Limbic System
Receives sensory information, returns output to brainstem, connects to frontal lobes & hypothalamus
VERY important for memory
4 parts of the limbic system?
Cingulate gyrus, parahippocampla gyrus, hippocampus, amygdala
Cingulate gyrus
Most medial cortex
Paraphippocampal gyrus
Continuous with cingulate gyrus
Hippocampus
Gray matter, large nucleus
Vital for memory, coding, & retrieval
Damage can result in anterograde amnesia
Amygdala
Important for recognition of fearful stimuli & response
"Quick screen" stimuli for emotional response
What are the white matter tracts?
Projection fibers, association fibers, and commissural fibers
Projection fibers
White matter nerve tracts from remote regions to and from the cortex
Examples of Projection fibers
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Corona radiate and internal capsule
Corona radiate
Fan-shaped white matter structure, funnels into basal ganglia/internal capsule
Internal capsule
Runs between cortical nuclei and basal ganglia
Association fibers
Intrahemispheric
Short: Nerve fibers that may interconnect adjacent lobes or gyri of cerebral cortex
Long: Interconnect cortical regions within the same hemisphere
Examples of Association fibers?
Superior longitudinal fasciculus
Inferior longitudinal fasciculu
Unicate fasciculus
Cingulum
Arcuate fasciculus
Arcuate fasciculus
Between posterior and anterior
Connects parietal and temporal lobe to frontal lobe
Connects Wernicke's and Broca's
Commissural fibers
Interhemispheric
Interconnect corresponding cortical regions of the two hemispheres
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Receives sensory information, returns output to brainstem, connects to frontal lobes & hypothalamus. Important for recognition of fearful stimuli & response. White matter nerve tracts from remote regions to and from the cortex. Fan-shaped white matter structure, funnels into basal ganglia/internal capsule. Short: nerve fibers that may interconnect adjacent lobes or gyri of cerebral cortex. Long: interconnect cortical regions within the same hemisphere. Connects parietal and temporal lobe to frontal lobe. Interconnect corresponding cortical regions of the two hemispheres. Internal collection of gray nuclei and white matter. Elongated mass of gray matter with long c shaped arching tail. Located in the midst of cerebral white matter, striated. White matter that separates the caudate from the lenticular nucleus & thalamus. Posture, locomotion, balance, and modulates movements for speech. Decrease muscle tone, actively inhibits the motor commands of the cns, and aids in coordinating muscle groups. Located on each side of the 3rd ventricle.
