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Principal Muscles I

Muscles and their Function

MuscleFunction
Frontal Raises eyebrow
Orbicularis oculi Closes eye
Orbicularis orbis Draws lips together
Zygomaticus Elevates corners of mouth
Masseter Closes jaw
Temporal Closes jaw
Sternocleidomastoid Rotates and flexes head and neck
Trapezius Extends head and neck
Pectoralis major Flexes and helps adduct upper arm
Latissimus dorsi Extends and helps adduct upper arm
Deltoid Abducts upper arm
Biceps brachii Flexes elbow
Triceps brachii Extends elbow
External oblique Compresses abdomen
Internal oblique Compresses abdomen
Transversus abdominis Compresses abdomen
Rectus abdominis Flexes trunk
Iliopsoas Flexes thigh or trunk
Sartorius Flexes thigh and rotates lower leg
Gluteus Maximus Extends thigh
Adductor longus Adducts thigh
Gracilis Adducts thigh
Pectineus Adducts thigh
Semimembranosus Flexes knee
Semitendinosus Flexes knee
Biceps femoris Flexes knee
Rectus femoris Extends knee
Vastus lateralis, intermedius, and medialis Extend knee
TIBIALIS ANTERIOR Dorsiflexes ankle
GASTROCNEMIUS Plantar flexes ankle
SOLEUS Plantar flexes ankle
Peroneus longus Plantar flex ankle
Created by: Supernurse
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