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
Sensory Processing Systems
sensory systems detect and analyse stimuli that come in the form of
Light/sound waves and particular chemicals (odors/taist
Somatosensory
body sense
found on the post-central gyrus in parietal lobe
Pacinian Corpuscles
specialise in presure and texture
Onion like, with layers of connective tissue that surround nerve endings of neurons with cell bodies in the DRG
adapts quickly
has mecanicly gated sodiam channels: when membrain is stretched it generates potental causing EPSP
Pathway from DRG to primary Somatosensory cortex
- DRG axons travel up spinal cord
- Goes to Medulla
- DRG form synapses on medulla neurons
- Medulla neurons send axons across midline
- form synapses on neurons on the contralateral ventral posterior nucleus in the thalamus
