1a Motor 1&2 LMNs Flashcards Preview

Neuro B3 - Motor > 1a Motor 1&2 LMNs > Flashcards

Flashcards in 1a Motor 1&2 LMNs Deck (8)
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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