Review 2 Flashcards
Secondary (II) sensory afferents innervate what type of intrafusal fibers?
Secondary sensory ending are seen in all BUT dynamic bag fibers.
Primary sensory endings are sensitive to changes in what?
sensitive to length and velocity
Secondary sensory endings are sensitive to changes in what?
secondary sensory endings are sensitive to only length
What type of neuron can adjust the sensitivity of the intrafusal fibers?
gamma motoneurons
What is the function of the golgi tendon organ
muscle force and tension
what is the function of muscle spindles
detects changes in muscle length and velocity
What is a motor unit?
an alpha motoneuron and muscle fibers it innervates
Characterisitcs of Surface EMG
- averages the activity of all (MUs)
- causes no discomfort
- is not selective
Characteristics of Intrafusal EMG
- records the activity of individual MUs
- is uncomfortable
- provides information about excitation of a small volume within a muscle
Primary (Ia) sensory afferents innervate what type of intrafusal fibers?
Primary endings are typically seen in virtually ALL intrafusal fibers