Upper Limb Muscles
Terms
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- Trapezius
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CN XI (C3, C4)
Elevate, depress, retract scapula
Upward rotation of glenoid fossa - Serratus anterior
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Long Thoracic n. (C5-C7)
Protraction of scapula - Teres major
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Lower subscapular n (C5,C6)
Internally rotate and ADduct humerus - Pectoralis minor
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Medial pectoral n. (C8, T1)
Depresses shoulder - Deltoid
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Axillary n (C5, C6)
ABduct shoulder
Flex and Extend shoulder - Levator scapular
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Dorsal scapular n. (C5)
Elevates scapula - Rhomboids
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Dorsal scapular n. (C5)
Retract scapula - Subscapularis
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Upper & lower subscapular n. (C5, C6)
Internally rotate humerus
ADduct humerus
Prevent humral head displacement
*Attaching humerus to scapula* - Supraspinatus
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Suprascapular n. (C5, C6)
ABduct (initial 30 degrees) humerus
*Attaching humerus to scapula* - Infraspinatus
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Suprascapular n. (C5,C6)
Externally rotate humerus
ABduct humerus - Teres minor
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Axillary n. (C5, C6)
Externally rotate humerus
*Attaching humerus to scapula* - Lattissimus dorsi
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Thoracodorsal n (C6, C7, C8)
Extend, ADduct, internally rotate humerus
*Attaching humerus to scapula* - Biceps Bracii
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Musculocutaneous n (C5,C6)
Supinate forearm, flexion at elbow - Coracobrachialis
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Musculocutaneous n. (C5, C6)
Flex humerus at shoulder - Brachialis
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Musculocutaneous n (C5,C6)
Flexes forearm - Triceps brachii
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Radial n. (C7,C8)
Extends forearm - Brachioradialis
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Radial n. (C5,C6)
Flexes forearm
Supinate or pronate forearm to neutral - Pronator teres
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Median n (C6,C7)
Pronates forearm
*Superficial anterior forearm compartment* - Flexor carpi radialis
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Median n (C7,C8)
flexes the wrist
*Superficial anterior forearm compartment* - Flexor digitorum superficialis
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Median n. (C7,C8)
Flexes the wrist
Flexes the fingers 2-5 at the PIP joint
*Superficial anterior forearm compartment* - Flexor carpi ulnaris
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Ulnar n. (C8-T1)
Flexes the wrist
*Superficial anterior forearm compartment* - Flexor digitorum profundus
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-2nd and 3rd: anterior interosseus (C6,C7)
-4th and 5th: ulnar n (C8,T1)
Flexes fingers 2-5 at the DIP joint
*Deep anterior forearm compartment* - Flexor pollicis longus
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Anterior interosseous n (C7,C8)
Flexes thumb at IP joint
*Deep anterior forearm compartment* - Pronator quadratus
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Anterior Interosseous n (C7,C8)
Pronates forearm
*Deep anterior forearm compartment* - Extensor carpi radialis longus
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Raidal n. (C6,C7)
Extends the wrist
*Superficial posterior forearm compartment* - Extensor carpi radialis brevis
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Deep radial n.
Extends the wrist
*Superficial posterior forearm compartment* - Extensor digitorum
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Posterior interosseus n. (C7,C8)
Extends fingers 2-4 at DIP, PIP, and MC-P joints
*Superficial posterior forearm compartment* - Extensor digiti minimi
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Posterior interosseus (C7,C8)
Extends finger 5 at DIP, PIP, MC-P joints
*Superficial posterior forearm compartment* - Extensor carpi ulnaris
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Posterior interosseus n. (C7,C8)
Extends the wrist
*Superficial posterior forearm compartment* - Supinator
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Deep radial n. (C5,C6)
Supinates forearm
*Deep posterior forearm compartment* - Abductor pollicis longus
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Posterior interosseus
ABducts thumb
*Deep posterior forearm compartment* - Extensor pollicis brevis/longs
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Posterior interosseus
Extends thumb
*Deep posterior forearm compartment* - Extensor indicis
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Posterior interosseus (C8,T1)
Extends finger 2 at MP joint
*Deep posterior forearm compartment* - Lumbricals
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-2nd and 3rd: median n
-4th and 5th: ulnar n
Simultaneous flex the fingers at MC-P joint while extending fingers at PIP and DIP joints -
Palmar interosseus
Dorsal interosseus -
ADduct fingers 2-5 (PAD)
ABduct fingers 2-5 (DAB)
-Ulnar n