Intro Basic Concepts Flashcards
What are the forces that produce motion at a joint?
Gravity and muscle contraction
What is a force that causes a desired motion?
Prime mover or agonist
What is a force that causes a motion opposite the desired motion?
Antagonist
What are the functions of synergistic muscles?
Stabilize joints and neutralize undesirable motions
What is a basic functional unit of each muscle?
Motor unit
What is a motor unit composed of?
Single motor neuron + muscle FIBER it supplies
What is an isotonic contraction?
Shortening/concentric
What is a static contraction?
Isometric
What is a lengthening contraction?
Eccentric
What are the two major parts of the CNS?
Brain + spinal cord
What is a peripheral nerve?
Group of nerve fibers (axons + supporting cells) located outside CNS
What is a cranial nerve?
Peripheral nerve arising from brain
What is a spinal nerve?
Peripheral nerve from spinal cord
How is a gross spinal nerve formed?
Dorsal + ventral roots from segment of spinal cord combine to form spinal nerve
How long is a typical spinal nerve and how does it terminate?
1 cm long, dorsal and ventral ramus