Lesson
Muscles (and Tendons) - continued
Muscle classified by fiber arrangement (architecture) (For speed/force)
–Parallel (FIBERS PARALLEL to line of pull)
- fusiform or strap or sheet- (eg. biceps brachii/sartorius/external oblique)
All fibers along length shorten for greater speed
–Oblique/Pennate (FIBERS OBLIQUE to line of pull)
- uni-pennate, bi-pennate, multi-pennate
(eg. flexor pollicis longus/rectus femoris/deltoid)
– When fibers shorten & rotate around tendon,
angle of pennation increases.
– Greater the angle, less the force transmitted
BUT more fibers packed into area = overall more force
Note: THICK OR HYPERTROPHIED pennated muscle have larger pennation angles