Sensorimotor Flashcards
motor output is guided by what
sensory input
How is sensorimotor system organized
hierarchically
What is Curare, what does it do
antagonist at nicotinic receptors which causes paralysis; lungs will stop movin
Botulinum toxin
Where does it grow, what does it do
Grows in improperly canned food and it prevents Ach release causing paralysis.
What is botox
botox is diluted toxin. prevents wrinkles by stopping muscle contractions around injection site.
What are two parts of the sensorimotor association cortex
posterior parietal association cortex and dorsolateral prefontral association cortex
What does the posterior parietal association cortex
integrates info about original position of body parts that are to be moved and positions of any external objects with which the body will interact
damage=deficits in perception and memory of spatial relationships; inaccurate reaching and grasping
function of dorsolateral prefrontal association cortex
evaluates external stimuli and initiates reactions to them.
Where does the secondary motor cortex receive info from ?
association cortex.
where does the secondary motor cortex send output?
primary motor cortex
Which part of the brain is involved in programming specific patterns of movements
secondary motor cortex
electrical stimulations here will results in complex body movement
secondary motor cortex
neurons of the secondary motor cortex fire prior to and during
voluntary motor response
What are the three main divisions of the secondary motor cortex
supplmementary motor area
premotor cortex
cingulate motor areas
Where is the primary motor cortex
precentral gyrus of frontal lobe
This structure is the major point of convergence of cortical sensorimotor signals
primary motor cortex
Major point of departure of sensorimotor signals from cerbral cortex
primary motor cortex
motor humunculus is an example of being
somatotopically organized
What can change the primary motor cortex?
learning, new skills show changes in electrical activity.
early msuical training expands…
M1
Two pathways through the spinal cord:
pyramidal system (corticospinal system) extrapyramidal system
What does the pyramidal system consist of
neuronal cell bodies in the cerebral cortex
What forms the pyramidal tract
axons which pass through the brainstem to the spinal cord. form PT.
Where does the pyramidal tract cross the midline.
The pyramidal tract croses the midline called a decussation in the medulla.
