Cerebrum (vernau) Flashcards
cerebrum general functions (4)
consciousness
personality
cognition/thought/decision-making
initiation and planning of movements
olfactory cortex composition
olfactory bulb, tract
piriform lobe
olfactory cortex function
“smell brain”
part of limbic system
- rhinencephalic region
paleocortex
piriform lobe
3-5 cortical layers
frontal lobe function
primary motor cortex
motor association cortex
behavior, planning, judgment
parietal lobe function
somatosensory cortex
including heat and pain sensation
temporal lobe function
auditory cortex
occipital lobe function
visual cortex
neocortex (aka…?)
aka isocortex
frontal, parietal, temporal, occipital lobes
6 cortical layers: molecular, exterior granular, exterior pyramidal, interior granular, interior pyramidal, polymorphic
limbic system composition
hippocampus
cingulate nucleus
amygdala
hypothalamus
mammillary bodies
limbic system function
4 Fs: fear fight flight fornication
memory
emotion
instinct
archicortex
hippocampus
evolutionarily the oldest
3 cortical layers
allocortex
archicortex and paleocortex
hippocampus and piriform lobe, respectively
basal nuclei function
plan and program movement
some behavior control
input: cerebral cortex
output: brainstem
caudate nucleus location
lateral wall of the lateral ventricle
association areas
1/5 of total cortex
composed of association fibers (remain within one hemisphere)
relate decisions with past experience
thinking part of the brain
commissural fibers
cross and link cerebral hemispheres
projection fibers
primarily somatosensory
link cortex and lowers parts of brain to spinal cord
basal nuclei dysfunction
involuntary movements at rest
difficulty initiating movement
YST in horses
clinical signs of cerebral dysfunction
SEIZURES
tremors
MILD paresis (primary motor pathways not from cerebrum)
change in personality
dulled mentation
- RAS: maintains cerebral awareness
abnormal movement/posture
central blindness
hemi-inattention
compare and contrast blindness and central blindness
blindness:
- loss of vision
- PLRs absent
- menace response deficits
central blindess:
- contralateral vision loss
- PLRs intact
- contralateral menace response deficits
narcolepsy
sudden transition from awake/conscious to REM sleep
+ cataplexy: sudden and transient loss of muscle tone (usually following excitement/happiness)
excited and happy to suddenly sleep and collapse
