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Sternocleidomastoid
ACTION
Bilateral: Flexion of neck, extension of head.
Unilateral: Lateral flexion of neck and head to same side. Rotation of neck and head to opposite side.
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Entire muscle: Retracts and upwardly rotates scapula.
Upper trap: elevates scapula, extends head.
Lower trap: depresses scapula.
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Retracts and downwardly rotates scapula.
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Elevates, retracts and downwardly rotates scapula.
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Extends, adducts and medially rotates humerus.
Known as the "hand cuff muscle"
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- Entire muscle adducts and medially rotates humerus.
- Clavicular head: flexes humerus.
- Sternal head: extends humerus.
"Forehand muscle in tennis"
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- Entire muscle: abducts humerus.
- Anterior deltoid: flexes and medially rotates humerus.
- Posterior deltoid: extends and laterally rotates humerus.
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- Flexes arm.
- Flexes and supinates forearm
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Flexes, laterally flexes and rotates trunk. Compresses abdomen.
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Quadratus Lumborum
ACTION
Lateral flexion of lumbar spine
"Hip Hiker"
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- Flexion and lateral rotation of thigh.
- Lateral flexion of lumbar spine
- Adducts thigh
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- Extension of thigh.
- Assists in lateral rotation and abduction of thigh
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Tensor Fascia Latae
ACTION
- Assists in abduction flexion and medial rotation of thigh.
- Stabilizes hip and knee joints.
- Just an assister - REAL job is to stabilize hip and knee via IT band
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- Extension of hip.
- Flexion of knee.
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Semitendinosus
Semimembranosus
ACTION
- Extension of hip
- Flexion of knee
- "Mule kick"
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Rectus Femoris
ACTION
- Flexion of hip
- Extension of knee
- "Kicking a ball"
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- Assists in flexion of knee
- Assists in flexion, abduction of lateral rotation of hip
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Dorsiflexion and inversion of foot
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Plantar flexion and eversion of foot
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- Plantar flexion of foot
- Assists in flexion of knee
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