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Vertebral Mechanics


Long Bones Lever (humerus)
Short Bones Support and shock absorption (carpals of wrist)
Flat bones protection (ilium)
Irregular bones specific function (vertebra)
Sesamoid bones alter angle of muscle insertion (patella)
Agonist Muscle moves away from initial anatomical position
antagonist muscle returns to the initial anatomical position
concentric contraction muscle shortens (like lifting weights)
isometric contraction muscle stays same length(holding up an object)
Eccentric contraction force generated is insufficient to overcome external load. like, lowering something so it falls slowly instead of drops.
anatomy of spine strength due to curvature. born with thoracic and sacral curves cervical and lumbar curves form during infancy
Structure of vertebrae Vertebral body, vertebral arch, spinous proces, transverse process, four articular processes.
If you push the left transverse process of a spine in, which way is the spine rotating? Right
Opposite of ease of motion Restriction. = barrier.
Indirect tehcniques of somatic dysfunction Ease of motion
Direct techniques of somatic dysfunction into the barrier
Fryette's 1st law of physiologic motion When thoracic and lumbar spine are in neutral position, coupled motion of sidebending and rotation for a group of vertebrae occurs to the opposite sides. GROUP-NEUTRAL-OPPOSITE sites.
Fryette's 2nd law of physiologic motion When thoracic and lumbar spine is sufficiently flexed or extended(non neutral), coupled motions of sidebending and rotation in a single vertebrae occur to the same side. Single- NON neutral - Same Side.
1st Law simple terms Neutral spine. group. Sidebending one way, rotation opposite way. L1-4 N SrRl
2nd law simple terms Flexed/extended spine. Single. Sidebending one way, rotation same way. L2 E RrSr
When thoracic and lumbar spine is flexed or extended, what is engaged? The facet joints. they dictate direction the body of vertebrae moves.
Fryette's 3rd law of physiologic motion initiating motion of a vertebral segment in any plane of motion will mofiy the movement of that segment in the other planes of motion.
Spine System of articulations Intervertebral discs cushion and distribute stress between vertebrae varying range of motion spine orientation during lift/load can influence stress
Created by: nady