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| Occipitofrontalis | raises the eyebrows
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| Orbicularis oculi | closes the eyelids and causes “crows feet” wrinkles in the skin at the lateral
corners of the eye.
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| Orbicularis oris | puckers the lips.
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| Buccinator | flattens the cheeks. Trumpeter’s muscle.
Orbicularis oris and buccinator are the kissing muscles
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| Zygomaticus | smiling muscle.
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| Levator labii superioris | sneering
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| Depressor anguli oris | frowning
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| Mastication | chewing
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| Intrinsic Tongue Muscles | change the shape of the tongue
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| Extrinsic Tongue Muscles | move the tongue.
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| Sternocleidomastoid | lateral neck muscle and prime mover. Rotates and abducts the head
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| Erector spinae | group of muscles on each side of the back. Responsible for keeping the back straight and the body erect.
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| External intercostals | elevate the ribs during inspiration.
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| Internal intercostals | contract during forced expiration
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| Abdominal wall muscles | The muscles of the anterior abdominal wall flex and rotate the vertebral column, compress the
abdominal cavity, and hold in the abdominal viscera.
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| Trapezius | rotates scapula
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| Serratus anterior | - pulls scapula anteriorly
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| Pectoralis major | adducts and flexes the arm
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| Latissimus dorsi | medially rotates, adducts, and powerfully extends the arm. “Swimmer
muscles”
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| Deltoid | attaches the humerus to the scapula and clavicle, and is the major abductor of the
upper limb.
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| Triceps brachii | extends the forearm. Occupies the posterior compartment of the arm.
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| Biceps brachii | flexes the forearm. Occupies the anterior compartment of the arm.
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| Brachialis | flexes forearm
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| Brachioradialis | flexes and supinates the forearm
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| Retinaculum | strong band of fibrous connective tissue that covers the flexor and
extensor tendons and holds them in place around the wrist so that they do not “bowstring” during
muscle contraction.
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| Flexor carpi | flexes the wrist.
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| Extensor carpi | extends the wrist
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| Flexor digitorum | flexes the fingers.
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| Extensor digitorum | extends the fingers.
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| diaphram | accomplishes quiet breathing
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| flexor carpi | flexws the wrist
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| on each side of the linea alba is what? | rectus abdominus
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| neck muscle | sternocleid omastoid
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| gastrocnemius ans soleus | form calf muscles
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| the sarcomeres isthe basic strucyural an functional unity of what? | muscle
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| trunk muscle | erector spinal
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| trapezius | rotates scapula
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| muscles that word in opposition to each other | antagonists
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| what muscle is located between the metacarpols | interossi
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| a thread like structure that extends from one end ofthe fiber to the other | myofibrils
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| 3 thoraic muscles | xternal intercostal diapham and intercostals
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| sarcomeres join end to end to form what | myofibrils
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| sartorius | flexes the thigh
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| zygo maticus | smiling muscle
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| gleueus maximus | buttocks
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| two tounge muscles | intrinsic and extrinsic
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| nerve cells that carry actions potiential to skeletal muscle fibers | motor neurons
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| enlarge nerve terminal | presyanatic terminal
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| secrete neurotransmitor | acetylcholine
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| charge difference across the membrane | resting membrane potential
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| brief reversal back of the charge | action potiental
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| each branch that connects to the muscle forms what | neuromuscular junctions
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| musce fiber will not respond to stimuelus reaches alevel called? | threshold
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| tetany | muscle remains contracted without relaxing
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| the fasciculis is composed of what single muscle cells? | fibers
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| each muscle fiber is surrounding by what connective tissue sheath | endomysium
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| muscles that work together to accomplish specific movement | synergists
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| pectoralis major | adducts and flexes the arm
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| each zline is an attachment site for what | actin
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| in the center of each sarcomere is another light area called what? | h zone
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| a single motor neuron and all the skeletal muscle fibers it intrevates is called what? | motor unit
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| what is near the center of the cell? | synapse
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| biceps brachii | flexes the forearm
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| deltoid | attaches the humerus to the scaoula and clavicle
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| brachialis | flexes forearm
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| latissimus dorsi | medially rotates, addusts, and powerfull extends the arm
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| serratus anterior | pulls scapula anitierofly
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| extensor carpi | extends the wrist
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| flexor digitorium | flexes the fingers
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| 4 pairs of mastification muscles | 2 pairs of steroids, temporalis, and masseter
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| extrinsic tongue muscles | moves the tongue
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| external inter costals | elevate the ribs during inspiration
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| internal intercostals | contract during forced expiration
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| 2 major kinds of protein fibers | actin myofilament and myosin myofibments
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| 19 hand muscles located within the hand | intrinsic hand muscles
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| extensor digitorium | extends the fingers
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| each skeletal muscles is surronded by what connective tissues sheath | epimysium
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| mastification | chewing
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| depressor angui oris | frowning
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| quad riceps femoris | extends the leg
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