Electromyography (EMG)

Reflects both the quality and quantity of electrical activity generated during a muscle contraction.

Muscle Biopsy

• removal and analysis of a small portion of whole muscle.
• provides a direct measurment of muscle properties.

Name All the fiber types.

1. Type I (slow oxidative muscle fibers)
2. Type IIA (Intermediate muscle Fibers)
3. Type IIB (Fast twitch fibers)
4. Type IID(x) (non staining)

Name all the imaging devices used to asses neuromuscular responses.

• ultra sound
• CT scanning
• MRI
• Near-Infared scanning

Define Muscle Fiber.

a single motor neuron and the # of fibers stimulated.

What is the general fiber to Nerve ratio for gross and fine movement patterns?

• Muscle involed in gross movments patterns have a high fiber to nerve ratio.
• Muscle involved in fine motor movement have a low fiber to nerve ratio.

Neuromuscular Junction

includes the interface between the motor neuron and the muscel fiber. it is the site of acetylcholine release: the chemical stimulus to change muscle fibers permeability to Na and K thus initiating depolarization.

Name the Motor Unit Types.

1. Slow Twitch- slow oxidative or slow fatigue resistant.
2. Fast Twitch:

-Fast Fatigue Resistant (FR) or fast oxidative glycolitic

-fast fatiguable or Fast Glycolytic

Relationship between MU to Muscle fiber Types.

Slow Twitch - Type I

Fast Twitch - Type IIA, Type IIB, Type IID (x)

How does fiber type very?

(hint: 4 different ways)

• within multi-function muscles.
• between different muscles
• between the same muscle of two different people.
• due to the function of the muscle.

Hermans Size Principle.

states that a small motor neuron will fire first before a large motor neuron.