Nerve Roots and Muscle Function

This set of flashcards covers key concepts related to the nerve roots of the brachial plexus and muscle function, including types of muscle fibers and contraction types.

How many nerve roots make up the brachial plexus?

5 nerve roots (C5-T1) make up the brachial plexus.

Which nerve roots make up the axillary nerve?

C5 & C6 make up the axillary nerve.

Which nerve roots make up the musculocutaneous nerve?

C5 - C7 make up the musculocutaneous nerve.

Which nerve roots make up the radial nerve?

C5-T1 make up the radial nerve.

Which nerve roots make up the ulnar nerve?

C8 & T1 make up the ulnar nerve.

Which nerve roots make up the median nerve?

C6-T1 make up the median nerve.

This is an example of which nerve's sensory distribution site?

Median nerve

What sensory distribution site is associated with the carpal tunnel?

The median nerve is associated with the carpal tunnel.

If a patient cannot sense touch on the upper lateral arm, which nerve might be affected?

The axillary nerve might be affected.

What is not a primary reason for understanding dermatomes?

Dictates the OT plan of care.

Which neurons take messages from the brain out to the periphery?

Motor neurons take messages from the brain out.

What term describes a muscle's ability to respond to a stimulus?

Irritability describes a muscle's ability to respond.

What term describes a muscle's ability to lengthen when a force is applied?

Extensibility describes a muscle's ability to lengthen.

Slow twitch muscle fibers are best for what?

Long periods of contraction.

Fast twitch muscle fibers are important for which ADL purpose?

Carrying a load of laundry upstairs.

Fast twitch muscle fibers are important for this ADL purpose?

Grabbing a jar that’s rolling off a table.

Slow twitch muscle fibers are important for which ADL purpose?

Maintaining upright posture.

Slow twitch muscle fibers are important for this ADL purpose?

Maintaining upright posture while toileting.

What do fine motor movements require?

Fewer muscle fibers.

What do gross motor movements require?

More muscle fibers.

Because of their shape, oblique muscles are great for:

Generating force

Holding a cup of coffee in your hand and holding it in front of yourself is an example of:

Isometric contraction.

Holding a cup of coffee in your hand and bringing it away from your mouth is an example of.

Eccentric contraction.

Holding a cup of coffee in your hand in front of you lifting it towards your shoulder is an example of:

Concentric Contraction