exercise 13 gross anatomy of the muscular system

synergists

aid the action of agonists either by assisting with the same movement or by reducing undesirable or unnecessary movement

direction of muscle fibers, muscle size, muscle location, number of origins, location of the attachments, muscle shape, muscle action

factors of naming skeletal muscles

prime movers/agonsts

muscles that are most responsible for producing a particular movement

antagonists

muscles that oppose or reverse movement

a. circular b. convergent c. fusiform d. parallel e. multipennate f. bipennate g. unipennate

patterns of fascicle arrangement in muscles

fixators

specialized synergists that immobilize the origin of a prime mover so that all the tension is exerted at the insertion

orbicularis oris

what muscle are you using to close your lips and pucker up

frontal belly of the epicranius muscle

what muscle are you using to raise your eyebrow to wrinkle your forehead

gluteus maximus

what muscle are you using when are in a deep knee bend and want to extend your thigh to resume upright posture

deltoid

what muscle are you using when you abduct your arm against resistance

triceps brachii

what muscle are you using when you acutely flex at your elbow and then try to extend the forearm against resistance

biceps brachii

what muscle are you using when you attempt to flex your forearm against resistance

orbicularis oculi

what muscle are you using when you blink your eyes or wink

trapezius

what muscle are you using when you elevate your shoulder against resistance

latissimus dorsi

what muscle are you using when you fully abduct the arm and extend at the elbow. Then adduct the arm against resistance

temporalis

what muscle are you using when you place your hands on your temples and clench your teeth

pectoralis major

what muscle are you using when you press your hands together at chest level with your elbows widely abducted