the motor system

Question 1

skeletal muscle

Answer 1

include strength, fine control and complexity. The movement of skeletal muscles is heavily dependent on the nervous system.

Question 2

Somites produce a sequence of structures

Answer 2

• Sclerotome makes the vertebral column bones (skeleton) and other bones.
• Dermomyotome is responsible for the underlying parts of the skin.
• Myotome makes muscle.

Question 3

motor fibres

Answer 3

send information away from the CNS

Question 4

sensory fibres

Answer 4

tell the CNS about stretching or tension in the muscle

Question 5

how does the muscle contrct

Answer 5

The axon of the ventral horn cell attaches to the muscle fibre. At the synapse, once a nerve impulse reaches the neuromuscular junction, acetylcholine is released into the synapse. The chemicals bind to receptors on the post-synaptic membrane triggering the muscle to contract.

Question 6

Simple reflex

Answer 6

sensory information comes into the spinal cord and motor information goes out at the same level.

Question 7

Pre-central gyrus:

Answer 7

core area of muscle movement. It enables

decision making of different areas of the body.

Question 8

Cerebellum:

Answer 8

receives information from the cerebral cortex, muscles and joints. It compares and gives feedback in order to obtain dynamic control and balance.

Question 9

Corticospinal tract

Answer 9

pathway of information from a neuron in the cortex to ventral horn cells in the spinal cord.
- Tract for fine, precise, coordinated movement.