reflexes

Question 1

monosynaptic vs polysynaptic reflexes contain which neurones? functions?

Answer 1

mono and poly have afferent and efferent neurones.
Poly also has interneurons
mono for simple reflex arcs
ploy for higher cognitive function and voluntary movement

Question 2

what is the function of muscle spindle (stretch) reflex ?

Answer 2

• keep muscle at consent length and prevent overstretching
• quickly and automatically adjust muscle tension in response to changes in muscle length

Answer 3

• Muscle undergoes stretch, activating muscle spindles (sensory receptors)
• Sensory neurons transmit stretch information to the spinal cord.
• mono reflex arc: Direct synapse between sensory neurons and alpha motor neurons.
• Alpha motor neurons stimulate stretched muscle, inhibiting antagonist muscles
• Rapid contraction prevents overstretching, maintaining muscle length.
• Contributes to postural stability and coordinated movements.
• Often part of larger reflex loops, including reciprocal inhibition and inverse stretch reflex.