Exam 2 Flashcards
Muscle Synergists
work together to execute motion
Muscle Antagonists
work in opposition to one another, when one contracts the other stretches
2 types of muscle fiber
fast twitch: contract quickly and fatigue easily
slow twitch: contract slowly and fatigue slowly
Pyramid motor system
pathway involving cell bodies in primary motor cortex with axons that form synapses on motor nerons in spinal cord\
M1
located on precentral gyrus of the frontal lobe.
contains motor map of the body arranged topogrphically
What is the neuromuscular junction?
Synapse that motor neurons form on muscular fibers
Motor unit
a motor neuron and all of the muscle fibers it contacts. in general one motor neuron contacts multipul muscle fibers
premotor cortex
generate motor in reaction to events
Non-primary Motor Cortex
Involved in motor planing
Supplementary motor area
preplanned movment
basal ganglia
in the forebrain that receives dopamine input. contains stop and go pathways (D1 go to D2 stop)
cerebellum
in the hind brain , known to contribute to precise motor control
Extrapyramidal Motor system
regulates the pyramidal motor system
Sensory Cortices
each sensory system has a primary sensory cortex
each forms topo map of receptos
can undergo placisity
Where do association cortices receive info from?
the primary sensory cortex
