BIOL 261 Lecture Notes - Lecture 10: Biceps, Aponeurosis, Triceps Brachii Muscle
Document Summary
Typically the more proximal attachment: more movable attachment of a muscle: pulled toward origin when muscle contracts. Tendons: attach muscles to bones: aponeurosis: a very broad tendon, origins of biceps brachii are on scapula. Insertion of biceps brachii is on radius: contraction pulls forearm toward shoulder, when it is not clear which end is which based on movement or position. Some variations on designation of origin and insertion. For a muscle between a broad aponeurosis and a narrow tendon: aponeurosis considered origin; tendon considered insertion. For a muscle with several tendons at one end, and one at the other end. Each of multiple tendons considered an origin: biceps, triceps. : fascicles organized as if part of a large feather. Fibers pull at an angle to the tendon: generate more tension but don"t pull their tendons as far as parallel muscles of same size.
