Motor systems I Flashcards
the corticospinal tract arises from what parts of the brain?
cortex of frontal and parietal lobes
the corticospinal tract splits into what tracts in the caudal medulla?
anterior and lateral corticospinal tracts
where does the anterior corticospinal tract terminate? what is its function?
- C and upper T spinal cord levels (gray matter - only UMNs that decussate in spinal cord) 2. skilled, voluntary movement of axial muscles (neck, shoulder, upper trunk) on OPPOSITE side of the body
where does the lateral corticospinal tract terminate? what is its function?
- all spinal cord levels (mostly for UL and LL) 2. skilled, well defined, voluntary movement on OPPOSITE side of the body (especially fingers)
where does the desire to initiate a movement originate?
association cortex
what areas are involved in the orientation of the trunk and upper limbs in the direction of intended movement / program the design and sequence of complex movements?
SMA and premotor cortex
what is the function of the posterior parietal cortex?
- sensory integration and visual guidance of movement2. evaluates location or position of body 3. forms movement plan that would accomplish a task
what is the function of the SMA and premotor cortex?
orientation of the trunk and upper limbs in the direction of intended movement / program the design and sequence of complex movements
SMA and PMC correspond to which Brodman’s area?
6
FEF corresponds to what Brodman’s area?
8
the posterior parietal cortex corresponds to what Brodman’s area?
7
the primary motor cortex corresponds to what Brodman’s area?
4
how does S-1 influence movement?
by modulating the relay of sensory input from visceral and somatic structures to the spinal cord
where are the pyramidal cells located? what is their function?
- layer 5 (internal pyramidal layer of cerebral cortex) 2. give rise to axons that form descending motor pathways (UMNs)
where are the LMNs that control movement of the body located?
ventral horn of spinal cord
