Lecture 10 Flashcards
1
Q
Alpha motor neuron
A
Large cell bodies Large, myelinated axons Axons project to extrafusal skeletal muscle fibers, with extensive axon terminal branching Releases acetylcholine FASTEST
2
Q
Gamma motor neurons
A
Medium-sized myelinated axons
Axons project to intrafusal fibers in the muscle spindle
3
Q
C5
A
Elbow flexion
4
Q
C6
A
Wrist extension
5
Q
C7
A
Elbow extension
6
Q
C8
A
Flexion of tip of middle finger
7
Q
T1
A
Finger abduction
8
Q
L2
A
Hip flexion
9
Q
L3
A
Knee flexion
10
Q
L4
A
Ankle dorsiflexion
11
Q
L5
A
Great toe extension
12
Q
S1
A
Ankle plantarflexion
13
Q
Muscle tone
A
Resistance to stretch in a resting muscle (passive stretch)
Provided by titin and weak actin-myosin bonds
Resistance to passive stretch is minimal
Unfolding of titin should be passive
14
Q
Decorticate rigidity
A
Lesion superior to midbrain
Flexion of upper limbs
Extended neck and lower limbs
Plantarflexion
15
Q
Decerebrate rigidity
A
Midbrain lesion
Extension of limbs and trunk
Internal rotation of upper limbs
Plantarflexion
