Final Flashcards
Efferent Sympathetic
Thoracolumbar outflow
Efferent Parasympathetic
Craniosacral outflow
Norepinephrine
Causes vasoconstriction
Somatic Nervous System
Voluntary control - skeletal muscles
Active Stiffness
neural signals, UMN firing, relfexes
Intrinsic Stiffness
produced by weak crossbridge attachements
Passive stiffness
resistance provided by titin (rubber band like)
Gamma Motor Neurons
Project to intrafusal muscle fibers in muscle spindle
Alpha Motor Neurons
project to extrafusal skeletal muscle
Henneman’s Size Principle
Order of recruitment = small to large alpha motor neurons
Alpha-Gamma Coactivation
Maintains stretch on central region of muscle spindle intrafusal fibers when muscle actively contracts due to collaterals that project to gamma motor neurons
Large Diameter Axons
Info from specialized receptors in muscles, tendons, and joints. Fast.
Medium Diameter Axons
Info from joint capsule, muscle spindles, cutaneous touch, stretch, and pressure receptors.
Small Diameter Axons
Info from crude touch, nociceptive, and temperature receptors
Spinothalamic Pain
fast pain from acute injury
Spinolimbic Pain
slow pain - throbbing, dull ache after initial injury. Not localized
Anterolateral Columns
Discrim pain, temp, and coarse touch.
Spinothalamic, Spinolimbic, Spinoreticular, Spinomesencephalic
Posterior Spinocerebellar Tract
High fidelity from legs and lower body, ipsilatral to cortex
Cuneocerebellar Pathway
High fidelity from UE and upper body
Anterior Spinocerebellar Tract
Internal Feedback from thoracolumbar spinal cord. Ascend contralaterally
Rostrospinocerebellar Tract
Internal feedback from cervical spinal cord. Ascend ipsilaterally.
IPSP
Cl- and K+
EPSP
Na+ or Ca++
