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Lecture 13

PNB 2264 Lecture Notes - Lecture 13: Anatomical Terms Of Muscle, Biceps, Tibialis Posterior Muscle


Department
Physiology and Neurobiology
Course Code
PNB 2264
Professor
crivello
Lecture
13

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Notes Day 13
Muscle Biomechanics
Muscles and other tissues
- How muscle interacts with soft tissues and bones
- This interaction is as important as how muscle generates tension
- Biomechanics the study of mechanical laws relating to movement of humans
- How things in life are made and shaped to be easier on our bodies ( minimize
stress/wear and tear)
Movement of muscles and bones
- Physical laws governing posture
- Evolutionary history
o Walking erect not on all fours
- Clinically important example, bariatric surgery people > 400 lbs
- Only way a small nurse can move such a large person is to have a good knowledge of
biomechanics
Relationship between muscles, tendons and bones
- Muscle attached through tendons
- Origin stationary bone
- Insertion greatest motion
- Belly area in between
Muscle action
- Agonist with motion
- Antagonist against motion
- Synergists work together for motion
- Primer mover major mover
- Fixators stabilize articulation
Nomenclature
- Location
- Size (maximus, minimus, longus, brevis)
- Shape (deltoid - triangle, quadratus rectangle, teres round)
- Orientation (rectus straight, oblique angle)
- Origin and insertion
- Origin number and function (masseter chew)
Fiber organization
- Microscopic and macroscopic levels
- Axis of force generation
o Not always obvious
- Parallel or at an angle
- Parallel fibers
o Parallel to axis of force generation (rectus)
Never extended full muscle length
o Develop tension rapidly
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