Week 8 Flashcards
What is the motor cortex comprised of?
supplementary motor area (SMA)
premotor cortex (PMC)
the primary motor cortex
Motor cortex receives input from what
The posterior parietal cortex
the SMA and PMC are involved in what
n movement planning in relationship to task & environmental constraints
Motor cortex function
The motor cortex is the region of the cerebral cortex involved in the planning, control, and execution of voluntary movements
Hierarchical organisation of the components of the motor system
- Cortex
- Cerebellum
- Basal-ganglia
- Brain stem
- Spinal cord
- Muscles
Premotor cortex function
- Receives inputs from posterior parietal cortex
- Projects mainly to proximal musculature (trunk & shoulders).
- helps establish postural set for a movement task
- is involved in the preparation for movement
- helps select a movement trajectory
PMC neurons respond to what
sensory aspects associated with movements
Define supplementary motor area
is a part of the primate cerebralcortexthat contributes to the control of movement.
Supplementary motor area functions
- involved in preparation & readiness for voluntary movement
- involved in planning and production of complex sequences of movements
- control of postural stability while standing or walking
Where are the neurons that simple finger flexion movements activate
in the motor and somatosensory cortices
Where are the neurons that complex finger movements activate
in the SMA, motor and somatosensory cortices.
Define bimanual coordination
Bimanual coordinationencompasses a large class of situations in which the brain must simultaneously control multiple movements, such as when we use our two hands to manipulate an object or perform a task
Define primary motor cortex
Primary motor cortex is a key brain structure involved in the acquisition and performance of skilled movement.
Primary motor cortex functions
- motor cortex is organised somatotopically & topographically
- motor homunculus is proportional to degree of skilled movement and
motor capacities of the muscles involved
- motor homunculus is proportional to degree of skilled movement and
neurons in motor cortex discharge selectively depending on what
the direction and force of movements
motor homunculus is proportional to what
degree of skilled movement and
motor capacities of the muscles involved;
what are the 2 major neural pathways
Lateral
Ventromedial
Functions of lateral pathways
- Voluntary movement of distal muscles
- Under direct voluntary control
What are the two tracts found in the lateral pathway
Corticospinal
Rubrospinal
what are the 4 tracts found in the ventromedial pathwat
Vestibulospinal tract
Tectospinal tract
Potine reticulospinal
Medullary reticulospinal tract
Vestibulospinal and tectospinal tract functions
Control posture of head and neck
Potine reticulospinal tract and medullary reticulospinal tract functions
Control posture of trunk and antigravity limb muscles
