Question

question 10
1 pts
the set of coordinated commands that control the programmed muscle activity mediated by extrapyramidal pathways is called the
extrapyramidal tract.
pyramidal tract.
motor tract.
motor program.
question 11
1 pts
each skin surface area supplied by sensory fibers of a given spinal nerve is a
dermatome.
plexus.
myotome.
ramus.
question 12
1 pts
which of the following is not an example of sympathetic stimulation?
constriction of the bronchioles
decreased secretion of the pancreas
constriction of the urinary sphincters
dilation of skeletal muscle blood vessels

Explanation:

• Question 10:
• The extrapyramidal tract is a set of pathways, not the coordinated commands.
• The pyramidal tract is related to direct motor control (corticospinal), not extrapyramidal - mediated muscle activity.
• The motor tract is a general term. A motor program is a set of coordinated commands for programmed muscle activity mediated by extrapyramidal pathways.
• Question 11:
• A dermatome is defined as the skin surface area supplied by sensory fibers of a given spinal nerve.
• A plexus is a network of nerves (e.g., brachial plexus).
• A myotome is the muscle mass supplied by a spinal nerve.
• A ramus is a branch of a spinal nerve (e.g., dorsal ramus, ventral ramus).
• Question 12:
• Sympathetic stimulation causes bronchodilation (not constriction). Parasympathetic stimulation causes bronchoconstriction.
• Sympathetic stimulation can decrease pancreatic secretion (e.g., in fight - or - flight, resources are diverted from digestion).
• Sympathetic stimulation can constrict urinary sphincters (e.g., to prevent urination during fight - or - flight).
• Sympathetic stimulation can dilate skeletal muscle blood vessels (to supply more oxygen to muscles during fight - or - flight).

Answer:

• Question 10: motor program
• Question 11: dermatome
• Question 12: constriction of the bronchioles