Lecture 30

Question 1

monosynaptic/ polysynaptic stretch reflex

Answer 1

tap on tendon, pull patella髌骨, pull extensor muscle, activate stretch receptor
1)proprioceptive info go up dorsal column to CNS
2)branch to grey matter, monosynaptic excitatory, connect btw afferent & motor
activate motor neuron, excite ipsilateral extensor, inhibit ipsilateral flexor

Question 2

muscle spindle component

Answer 2

tendon

Golgi tendon organ: measure F the muscle exert, attach muscle to bone
extrafusal muscle fiber: generate F
stretch receptor: measure length of the muscle, in parallel w/ muscle, same length as muscle

intrafusal muscle fiber
alpha activate extrafusal fiber
gamma maintain muscle spindle sensitivity

afferent
1a dynamic change in muscle length
2 static muscle length

Question 3

inverse stretch reflex

Answer 3

active contraction more tension than stretching

Question 4

Golgi tendon

Answer 4

muscle fiber
calsule
1b afferent
tendon
free nerve ending
collagen fiber

Question 5

Golgi tendon organ reflex/ inverse stretch

Answer 5

extensor muscle contract, generate F, F felt by Golgi tendon organ which are located in tendons
Golgi tendon organ active
1)go up ipsilateral dorsal column to CNS/ brain
2)activate inhibitory interneuron
inhibit ipsilateral extensor, excite ipsilateral flexor
muscle relax

Question 6

sensorimotor cortex process

Answer 6

info start in frontal area

to motor area

从前到后的顺序premotor cortex, primary motor cortex, central sulcus, somatosensory cortex

Question 7

motor control & brain area

Answer 7

muscle spindle& Golgi tendon
1)extrapyramidal, trunk & posture
2)corticospinal, skilled movement

Question 8

corticospinal control process

Answer 8

cross at medulla
innervate alpha gamma motor neuron
direct activate motor neuron
extrapyramidal need activate interneuron, then activate motor neuron