Primary action for muscles

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Objective 4 of Muscular System: List a primary action for each identified musclen

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57 Terms

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Occipitofrontalis (Frontal & Occipital Belly)

moves up the scalp and eyebrows

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Orbiculais oculi

closes eye

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Orbicularis oris

Compress lips

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Levator labii superioris

elevates upper lip

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Zygomaticus

elevates corners of mouth (smile)

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Depressor anguli oris

Draws corners of mouth down (frown)

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Depressor labii inferioris

Lowering lower lip (depression of lower lip)

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Temporalis

Elevates mandible (synergist with masseter)

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Masseter

Elevates mandible (synergist with temporalis)

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Sternocleidomastoid

Flexes your neck

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Trapezius

Extends your neck (Helps keep head in an upright position)

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External Intercostals

Elevates the ribcage (Inhalation)

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Internal Intercostals

Depress the ribcage (Exhalation)

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Pectoralis major

Flexion & abduction of the shoulder

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Pectoralis minor

Protacts scapula

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Serratus anterior

Protacts scapula

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Latissimus Dorsi

Extension @ shoulder, adduction of the arm

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Diaphragm

Expand thoracic cavity (Separates the thoracic and abdominal cavities)

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Rectus abdominus

Flexion of vertebral column

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Rectus abdominus: Linea Alba

Flexion of vertebral column

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Rectus abdominus: External Obliques

Flexion of vertebral column

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Rectus abdominus: Internal Obliques

Flexion of vertebral column

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Rhomboideus major

Retracts Scapula

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Infraspinatus

Adduct shoulder

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Supraspinatus

Abduct shoulder

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Subscapularis

Medially rotate shoulder

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Teres major

Medially rotate shoulder

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Teres minor

Laterally rotate shoulder

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Deltoid

Extend arm

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Biceps Brachii

Flex forearm

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Brachialis

Flex forearm

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Triceps brachii

Extend forearm

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Brachioradialis

Flex forearm

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Extensor carpi radialis longus

Extend wrist

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Extensor digitorum

Extend wrist

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Extensor carpi ulnaris

Extend wrist

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Flexor carpi ulnaris

Flex wrist

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Palmaris longus

Flex wrist

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Flexor carpi radialis

Flex wrist

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Pronator teres

Pronate forearm

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Gluteus maximus

Extend thigh

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Tensor fasciae latae

Abduct thigh

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Iliotibial tract

Stabilization of the hip and knee joints

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Gracilis

Adduct thigh

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Sartorius

Laterally rotate thigh

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Rectus femoris

Extend leg

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Vastus medialis

Extend leg

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Vastus lateralis

Extend leg

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Biceps femoris

Flex leg

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Semitendinosus

Flex leg

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Semimembranosus

Flex leg

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Tibalis anterior

Dorsiflex foot

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Extensor digitorum longus

Dorsiflex foot

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Fibularis longus

Evert foot

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Soleus

Plantarflex foot

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Gastrocnemius

Flex leg

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Achilles tendon

Plantarflex foot

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