ANAT 2646 Spinal Reflexes - secondary - degree of stretch...

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Spinal Reflexes Motor innervation of skeletal muscle motor end plate motor units in old age Sensory innervation of skeletal muscle neuromuscular spindles tendon endings free nerve endings Innervation of joints
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Motor Unit-functional unit of the motor system An alpha motor neuron and the muscle fibers it innervates Four components Cell body, axon, neuromuscular junction, muscle fibers One neuron may innervate up to 1000 muscle fibers
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Motor End Plates Sole plate Acetylcholine (excitatory)
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Aging on Motor Units Loss of motor neurons from spinal cord and brainstem Peripheral neuropathy
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Sensory Innervation of Skeletal Muscle Muscle spindles Extrafusal fibers Intrafusal fibers stretch receptors
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Innervation Motor Supply gamma motor neurons Sensory supply primary - rate of stretch
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Unformatted text preview: secondary - degree of stretch Sensory -wraps around the nuclear bag and chain Activation Muscle spindles are stretch receptors active produced by fusimotor fibers passive knee jerk - tendon is stretched monosynaptic - excitatory polysynaptic - inhibitory to antagonistic muscle Golgi Tendon Organs Found at muscle-tendon junctions Measures the force of the contraction Protects muscle from excessive contraction Negative feedback disynaptic excites the antagonistic muscle Innervation of Joints Freely ending unmyelinated nerve fibers in ligaments, capsules and menisci pain (nociception) excitatory reflex Sensory information from joints, muscle, and skin are integrated in the parietal lobe...
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This note was uploaded on 11/23/2011 for the course ANAT 2646 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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ANAT 2646 Spinal Reflexes - secondary - degree of stretch...

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