ch. 10 pg.149-151

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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.


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