Flashcards in Chapter 10-muscles Deck (28)
Fixed end. Stationary, proximal end of muscle
Each origin is a head
Mobile end. Distal end of muscle attached to the bone undergoing most movement
Muscle between origin and insertion
Tendons that are long and cable like; broad and sheet like
A muscle that accomplishes movement. Flexion
Opposite to agonist. Relaxes and stretches
Group of muscles that work together to perform movement
Amount a group of synergist, one muscle plays major role in accomplishing movement
Muscles that hold one bone in place while more distal bone is moved
Orbicularis Otis and orbicularis oculi arrange a circle around an opening. Iris of eye, mouth
Triangular in shape. Broadly distributed Fascicles that come together at one tendon. Pectoralis major and minor
Fascicles lie parallel to one another and long axis of the muscle. Trapezius, rhomboideus, rectus abdominis
Fascicles originate from a tendon that runs the length of the entire muscle. Three patterns.
Patterns of pennate muscle
Unipennate, bipennate, multipennate
Fascicles on only one side of tendon palmar interosseus. Semi membranous.
Fascicles on both sides of tendon. Rectus femoris
Fascicles arranged at many places around central tendon. Spread out at angles to many smaller tendons. Deltoid
Fascicles lie parallel to long axis of muscle. Belly of muscle is larger in diameter than ends. Biceps brachii (2 heads) triceps brachii (3 heads)
What geometric shapes can a muscle have?
Triangular, quadrate or rectangular, tres (round) rhombus
Criteria for naming muscles
Location, size, shape, orientation of fasciculi, origin and insertion, number of heads, function.
Rigid shaft capable of turning a hinge or pivot point (bone)
Hinge or pivot point. (Joint)
Class I lever system
Class II lever system
Pull---- weight in fulcrum