Question

Construction of Neural Circuits

____ 17. Which of the following shows the correct order of the steps for motor axon growth during the construction of neural circuits?
1. Formation of plexus
2. Formation of ventral root
3. Synapse on individual muscle fibers
4. Enter target muscle
5. Formation of large nerves
A. 1, 2, 4, 5, 3
B. 2, 1, 5, 4, 3
C. 4, 3, 5, 2, 1
D. 2, 5, 1, 4, 3
E. 1, 2, 5, 4, 3

Answer 1

The five steps in motor axon growth occur in the following order: Formation of the ventral root, formation of large nerves, formation of a plexus, entering the target muscle, and synapsing on individual muscle fibers. The correct answer is B. 2, 1, 5, 4, 3.

Step-by-step explanation:

Correct Order of Steps in Motor Axon Growth

The construction of neural circuits during motor axon growth involves a series of developmental steps that occur in a specific order. The correct sequence that represents these steps is critical for understanding how motor pathways at a cellular level contribute to the overall functioning of the motor system. Based on the options provided, the correct order of steps for motor axon growth during the construction of neural circuits is:

1. Formation of the ventral root: where motor neuron axons originate.
2. Formation of large nerves: when axons are bundled.
3. Formation of a plexus: a network of nerves.
4. Enter target muscle: where motor neurons extend toward.
5. Synapse on individual muscle fibers: where the neuromuscular junctions form to initiate muscle contraction.

Therefore, the correct answer is B. 2, 1, 5, 4, 3.