ch. 10 pg.149-151
Brachialis
Arm
Gluteus
Buttock
Pectoralis
Chest
Masseter
Chewer
Maximus
Large
Antagonist
Muscle working in opposition to another muscle.
Teres
Round
Brevis
Short
Rectus
Straight
Circular
acts as a sphincter to close an opening.
Depressor Anguli Oris
depresses the angle of the mouth, as in frowning or pouting.
Convergent
fasciculi arrive at one common tendon from a wide area; triangular in shape.
Parallel
fasciculi organized parallel to the long axis of the muscle, but they terminate on a flat tendon that spans the width of the entire muscle.
Origin
fixed end of the muscle; usually the most stationary, proximal end.
Anterior neck muscles
flexion of the head is largely caused by gravity but is assisted by this muscle group.
Corrugator Supercilii
furrows the skin between the eyebrows, as in frowning.
Posterior neck muscles and Lateral neck muscles
involved in the rotation and lateral flexion of the head.
Belly
largest part of a muscle; between its origin and insertion.
Posterior neck muscles
mainly responsible for the extension of the head.
Class III lever system
most common type of lever system in the body.
Agonist
muscle that accomplishes a certain movement, such as a flexion.
Levator Labii Superioris
muscle that makes sneering possible.
Prime Mover
muscle that plays the major role in accomplishing a desired movement.
Unipennate
muscle with all fasciculi on one side of a tendon.
Bipennate
muscle with fasciculi arranged on two sides of a tendon.
Fusiform
muscle with wider belly, tapering at the ends.
Fixators
muscles that stabilize the origin of the prime mover.
Synergists
muscles that work together to cause movement.
Occipitofrontalis
raises the eyebrows and furrows the skin of the forehead.
Levator Palpebrae Superioris
rises the upper eyelids.
Lateral neck muscles
sternocleidomastoid is an example.
Class I lever system
the fulcrum is between the pull and the weight; a child's seesaw is an example.
Class III lever system
the pull is located between the fulcrum and the weight; a person operating a shovel is an example.
Orbicularis Oris and Buccinator
two muscles that function in kissing.
Risorius and Zygomaticus Major & Minor
two muscles that function in smiling.
Aponeurosis
very broad and sheetlike tendon.
Class II lever system
weight is located between the fulcrum and the pull; a wheelbarrow is an example.
Quadriceps
Four heads.
Deltoid
Triangular
Orbicularis oculi
close the eyelids.
Tendons
connective tissue connection between muscles and bones.