MUSCLE CENSUS (Cat soleus muscle)

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MUSCLE CENSUS (Cat soleus muscle)

• 25,000 extrafusal muscle fibers
• 50 muscle spindles
• 50 primary endings
• 70 secondary endings
• 100 ? efferents
• 300 intrafusal fibers
• 45 Golgi tendon organs
• 150 a efferents

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STRETCH REFLEX
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TIMING OF STRETCH REFLEX
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MUSCLE SPINDLE ACTIVATION
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?-LOOP CONTROL
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TIMING OF ?-LOOP
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RECIPROCAL INHIBITION
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MORE INHIBITION

• Renshaw cells
• Negative feedback
• Self inhibition through interneuron

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GOLGI TENDON ORGAN (CLASP-KNIFE) REFLEX
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POLYSYNAPTIC AND CROSSED REFLEXES

1. Stretch (monosynaptic) reflex
2. Reciprocal inhibition
3. Crossed flexor reflex
4. Crossed extensor reflex