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What is the action of the Splenius Capitis?
- Alone - laterally bends and rotates the head
- With Splenius cervicis - Extend head and neck
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What is the action of the Splenius Cervicis?
- Alone - laterally bends and rotates the head
- With Splenius cervicis - Extend head and neck
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What is the action of the Semispinalis capitis?
Extends neck and rotates head to opposite side
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What is the action of the Iliocostalis?
- Alone - Lateral flexion
- As part of erector spinae group - Extends the vertebral column
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What is the action of the Longissmus?
- Alone - Lateral flexion
- As part of erector spinae group - Extends the vertebral column
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What is the action of the Spinalis?
- Alone - Lateral flexion
- As part of erector spinae group - Extends the vertebral column
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What is the action of the Serratus Posterior Superior?
Elevates ribs during inspiration
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What is the action of the Serratus Posterior Inferior?
Pulls ribs down and out during inspiration
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What is the action of the Trapezius?
- Upper: Elevates and upward rotation of scapula
- Middle: Retraction of scapula
- Lower: Depress and upwardly rotate scapula
- See page 702
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What is the action of the Latissmus Dorsi?
Extends, adducts and medially rotates the humerus
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What is the action of the Rhomboid Major?
Adducts, retracts, and downwardly rotates scapula
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What is the action of the Rhomboid Minor?
Adducts, retracts, and downwardly rotates scapula
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What is the action of the Levator Scapulae?
Elevates and downwardly rotates scapula
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What is the action of the Pectorlais Major?
Adducts and medially rotates humerus
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What is the action of the Pectorlais Minor?
Protracts and depresses scapula
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What is the action of the Subclavius?
Stabilizes and depresses clavicle
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What is the action of the Serratus Anterior?
- Protracts and upwardly rotates scapula
- Stabilizes scapula on thoracic wall
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What is the action of the Coracobrachialis?
Flexion and adduction of the arm
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What is the action of the Deltoid?
- Anterior fibers: Flex humerus
- Middle fibers: Abduct humerus
- Posterior fibers: Extend humerus
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What is the action of the Teres Major?
Medially rotates and adducts humerus
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What is the action of the Teres Minor?
Stabilizes shoulder joint and laterally rotates humerus
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What is the action of the Supraspinatus?
Stabilizes shoulder joint and abducts humerus
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What is the action of the Infraspinatus?
Stabilizes shoulder joint and laterally rotates humerus
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What is the action of the Subscapularis?
Stabilizes shoulder joint and medially rotates humerus
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What is the action of the Brachialis?
Flexion of forearm
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What is the action of the Biceps brachii?
- Flexion of forearm
- Supination of forearm
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What is the action of the Triceps brachii?
Extends forearm
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What is the action of the Anconeus?
Extends forearm
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What is the action of the Brachioradialis?
Flexes forearm
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What is the action of the Supinator?
Supinates forearm
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What is the action of the Pronator teres?
Pronates and flexes forearm
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What is the action of the Pronator quadratus?
Pronates forearm
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What is the action of the Extensor carpi radialis longus?
Extends and abducts hand at wrist
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What is the action of the Extensor carpi radialis brevis?
Extends wrist
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What is the action of the Extensor carpi ulnaris?
Extends and adducts hand at wrist
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What is the action of the Flexor carpi radialis?
Flexes and abducts wrist
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What is the action of the Flexor carpi ulnaris?
Flexes and adducts wrist
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What is the action of the Palmaris longus?
Flexes wrist, tightens palmar aponeurosis
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What is the action of the Flexor digitorum superficialis?
- Flexes PIP
- Assists in MCP flexion
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What is the action of the Flexor digitorum profundus?
Flexes DIP joints of digits
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What is the action of the Extensor digitorum?
- Extends MCP joints of digits
- assits in extension of IP joints
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What is the action of the Extensor indices?
Extends index finger at MCP
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What is the action of the Extensor digiti minimi?
- Extends MCP joint of pinky
- Assits in extension of IP joints
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What is the action of the Extensor pollicis longus?
Extends IP joint of thumb
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What is the action of the Extensor pollicis brevis?
Extends MCP and CMC joints of thumb
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What is the action of the Abductor pollicis longus?
Abducts thumb at CMC joint
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What is the action of the Flexor pollicis longus?
Flexes IP of thumb
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What is the action of the Lumbricals 1,2?
- Flexes MCP joints
- Extends IP joints
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What is the action of the Lumbricals 3,4?
- Flexes MCP joints
- Extends IP joints
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What is the action of the Dorsal interossei 1-4?
- Abduct digits from middle finger
- Assist in flex MCP joints and extend IP joints
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What is the action of the Palmar interossei 1-3?
- Adduct digits toward middle finger
- Assist in flex MCP joints and extend IP joints
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What is the action of the Adductor pollicis?
Adducts thumb toward middle finger @ CMC joint
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What is the action of the Abductor pollicis brevis?
- Adducts thumb at CMC
- Assists in opposition
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What is the action of the Flexor pollicis brevis?
Flexes thumb at IP joint
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What is the action of the opponens pollicis?
- Opposes thumb
- Rotates thumb medially
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What is the action of the Abductor digiti minimi?
Abducts pinky
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What is the action of the Flexor digiti minimi brevis?
Flexes MCP joint of pinky
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What is the action of the Opponens digiti minimi?
Opposes pinky to thumb
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What is the action of the Palmaris brevis?
Tightens and corrugates skin over palm to improve grip
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