GSE ( General Somatic Efferent ) - motor neuron into skeletal muscle
GSA (General Somatic Afferent )- sensory neuron carries info from sk. Muscle ( pain, T, stretch ) Cell body in the dorsal root ganglion is associated with mechano-proprioreceptors
Neuromuscular junction – or myoneural junction, where the nerve and the muscle synapse. Consists of the motor end plate ( where axon terminals contact sarcolemma ) and the cell membrane of a muscle fiber
Neurotransmitter – ACH ( stored in synaptic vescicles at axon terminals, released by nerve impulse into the neuromuscular cleft )
Consists of a single motor neuron and all of the muscle fibers it innervates. 1 motor neuron may innervate as few as 2 or 3 muscle fibers ( fine control ) or as many as 200-300 muscle cells ( gross function )
Recruitment of motor units ( grocery bag story ) – How many muscle fibers are needed to perform a certain task?
5. Muscle Tone is a normal state of partial contraction, maintained by working out.
Spasm – too much muscle tone, irritation, knots, subluxation, charley horse.
Flaccid – not enough tone, from lack of use, subluxation?
Origin of a muscle - the less movable of the two points of attachment of a muscle, that end which is attached to the more fixed part of the skeleton. The place where the muscle originates.
Insertion of a muscle - the movable end, that end which moves in relation to the rest of the skeleton
Origin and insertion can flip flop sometimes, SCM example. Proximal and distal attachment is a better way. You have to be given a function in order to determine the origin and insertion. A muscle only does one thing, so origin and insertion cannot change.