1a Motor 1&2 LMNs Flashcards
1
Q
Where in the spinal cord are lower motor neurons located? Which Rexed’s Lamina?
A
ventral horn, lamina IX
2
Q
What neurotransmitter does LMNs secrete? What kind of receptors does it bind to?
A
nAch; nicotinic cholinergic receptor
3
Q
What do Lower Alpha Motor Neurons innervate?
A
Extrafusal Fibers (skeletal muscle)
4
Q
What do Lower Gamma Motor Neurons innervate?
A
Intrafusal Fibers (Muscle Spindle Organ)
5
Q
What does the Polio virus do?
A
attack LMNs
6
Q
How does a motor unit increase power/contraction?
A
First, increase frequency of action potentials. Second, recruitment.
7
Q
What type of neuron is a small LMN?
A
slow-twitch
8
Q
What type of neuron is a large LMN?
A
fast twitch
