Term
| Which muscle group are extensors? |
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Definition
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Term
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Definition
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Term
| Explain the characteristics of distal muscle groups |
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Definition
they are FLEXORS
phasically allow movement
LATERAL a-motorneurons and interneurons in spinal cord |
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Term
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Definition
EXTENSORS
they TONICALLY support posture
their neurons are located MEDIALLY
are found VENTRAL (anterior) to distals |
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Term
| This system utilizes the pyramids. |
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Definition
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Term
| How is the body arranged in the spinal cord |
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Definition
head is MOST lateral
arm trunks
Legs most medial |
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Term
| What does the corticospinal system use to innervate muscles? |
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Definition
| cortical columns- 100-300 microns |
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Term
| Explain the input-output coupling theory? |
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Definition
proprioceptive input travels to precentral cortical column
It arrives via VA and VL to influence efferent output |
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Term
| Where does the proprioceptive input begin? |
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Definition
| distal joint involved in the movment of the muscle. |
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Term
| Where does the cutaneous input to the cortical columns originate from? |
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Definition
| skin region lying in the pathway. |
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Term
| What is area 4 responsible for? |
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Definition
| the precentral cortex (distal) |
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Term
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Definition
| precentral cortex (proximal and axial) |
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Term
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Definition
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Term
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Definition
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Term
| Where does area 1,2,3 terminate? |
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Definition
| dorsal horn and dorsal column nuclei |
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Term
| explain pathway of corticospinal fibers |
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Definition
| precentral cortex-->corona radiata-->posterior internal capsule-->cerebral peduncles-->pyramids-->decussation (80% contra-LCSt) |
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Term
| What other fibers travel with the CST? |
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Definition
| Post central gyrus. they both synapse on dorsal horn |
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Term
| Corticopontine fibers pathway |
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Definition
frontal/temporal cortex-->ant. limb of internal capsule-->pontine nuclei
POT fibers travel in posterior limb |
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Term
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Definition
| pre-and post cortex-->genu (middle)internal capsule-->reticular formation, motoneurons of CN nuclei, and sensory relay nuclei |
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Term
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Definition
| precentral cortex-->posterior limb of internal capsule--> red nucleus of midbrain |
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