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Principal Muscles I
Muscles and their Function
Muscle | Function |
---|---|
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 |