Primary action for muscles

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

Occipitofrontalis (Frontal & Occipital Belly)

moves up the scalp and eyebrows

Orbiculais oculi

closes eye

Orbicularis oris

Compress lips

Levator labii superioris

raises upper lip

Zygomaticus

elevates corners of mouth (smile)

Depressor anguli oris

Draws corners of mouth down (frown)

Depressor labii inferioris

Lowering lower lip (depression of lower lip) [draws corners of mouth down]

Temporalis

Elevates mandible (synergist with masseter)

Masseter

Elevates mandible (synergist with temporalis)

Sternocleidomastoid

Flexes your neck

Trapezius

Elevates, retracts, or depress scapula

External Intercostals

Elevates the ribcage (Inhalation)

Internal Intercostals

Depress the ribcage (Exhalation)

Pectoralis major

Flexion & abduction of the shoulder

Pectoralis minor

Protacts & Depress scapula

Serratus anterior

Protacts and stablize scapula

Latissimus Dorsi

Extension @ shoulder, adduction of the arm

Diaphragm

Expand thoracic cavity (Separates the thoracic and abdominal cavities)

Rectus abdominus

Flexion of vertebral column

Rectus abdominus: Linea Alba

Flexion of vertebral column

Rectus abdominus: External Obliques

Flexion of vertebral column

Rectus abdominus: Internal Obliques

Flexion of vertebral column

Rhomboideus major

Elevates and Retracts Scapula

Infraspinatus

Adduct shoulder

Supraspinatus

Abduct shoulder

Subscapularis

Medially rotate shoulder

Teres major

Medially rotate shoulder

Teres minor

Laterally rotate shoulder

Deltoid

Flex, Abduct, and Extend shoulder

Biceps Brachii

Flex forearm

Brachialis

Flex forearm

Triceps brachii

Extend forearm

Brachioradialis

Flex forearm

Extensor carpi radialis longus

Extend wrist

Extensor digitorum

Extend wrist

Extensor carpi ulnaris

Extend wrist

Flexor carpi ulnaris

Flex wrist

Palmaris longus

Flex wrist

Flexor carpi radialis

Flex wrist

Pronator teres

Pronate forearm

Gluteus maximus

Extend thigh

Tensor fasciae latae

Abduct thigh

Iliotibial tract

Stabilization of the hip and knee joints

Gracilis

Adduct thigh

Sartorius

Laterally rotate thigh

Rectus femoris

Extend leg

Vastus medialis

Extend leg

Vastus lateralis

Extend leg

Biceps femoris

Flex leg

Semitendinosus

Flex leg

Semimembranosus

Flex leg

Tibalis anterior

Dorsiflex foot

Extensor digitorum longus

Dorsiflex foot

Fibularis longus

Evert foot

Soleus

Plantarflex foot

Gastrocnemius

Flex leg

Achilles tendon

Plantarflex foot