Supraspinatus Infraspinatus Suprascapular Nerve C 5 C 6

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§ Supraspinatus § Infraspinatus Suprascapular Nerve C 5 -C 6 § Pectoralis Major Lateral

§ Supraspinatus § Infraspinatus Suprascapular Nerve C 5 -C 6 § Pectoralis Major Lateral Pectoral Nerve C 5 -C 7 • Muscles in the anterior compartment of arm* • Lateral Antebrachial Cutaneous nerve Musculocutaneous Nerve C 5 -C 7 • Levator scapulae • Rhomboid Major • Rhomboid Minor Dorsal Scapular Nerve C 5 • Diaphragm Accessory Phrenic Nerve C 5 Superior Trunk C 4 (Vertebrae) C 5 Root (Anterior Primary Rami) C 5 (Vertebrae) Lateral Cord • Muscles of the posterior compartment of the arm and forearm* Median Radial Nerve C 5 -T 1 • Muscles of the anterior compartment of forearm* EXCEPT: - (entire) Flexor carpi radialis Lower Scapular - (½ of) Flexor Digitorum Frofundus Nerve C 5 -C 6 (these 1½ are innervated by Ulnar nerve) § Subscapularis § Teres Major Ulnar Nerve C 8 -T 1 * § Deltoid § Teres Minor Axillary Nerve C 5 -C 6 Posterior Cord Thoracodorsal Nerve C 6 -C 8 § Latissimus Dorsi * Often C 7 -T 1 • Muscles of the hand EXCEPT: - (entire) Muscles of Thenar Eminence - (½ of) Lateral two Lumbercals (these 1 -½ are innervated by Median nerve) Nerve to Subclavius C 5 -C 6 • Subclavius Middle Trunk Medial Antebrachial Cutaneous Nerve C 8 -T 1 § Skin of the medial side of the antebrachium Medial Brachial Cutaneous Nerve T 1 § Skin of the medial side of the brachium C 7 Root (Anterior Primary Rami) C 8 Root (Anterior Primary Rami) Inferior Trunk Medial Pectoral Nerve C 8 -T 1 • Pectoralis Major • Pectoralis Minor C 6 (Vertebrae) C 7 (Vertebrae) Upper Subscapular Nerve C 5 -C 6 § Subscapularis Medial Cord C 6 Root (Anterior Primary Rami) T 1 (Vertebrae) T 1 Root (Anterior Primary Rami) Long Thoracic Nerve C 5 -C 7 • Serratus anterior L 2 T 2 (Vertebrae)

Roots = (Anterior rami of spinal nerves) Trunks = Superior Trunk = Junction of

Roots = (Anterior rami of spinal nerves) Trunks = Superior Trunk = Junction of C 5 and C 6 Middle Trunk = C 7 Inferior Trunk = Junction of C 8 and T 1 (Junction of Roots) Cords = Lateral Cord (Junction of trunks) - Junction of Superior & Middle Trunks (serves Anterior) Anterior Division = (serves Anterior compartment) Posterior Division = (serves Posterior compartment) Posterior Cord - Junction of Superior, Middle and Inferior Trunks (serves Posterior) Medial Cord - Extension of Inferior Trunk (serves Anterior) - Junctions of Lateral and Medial cords (serve Anterior compartments of Arm and Forearm) - Junction of branches of Superior, Middle, and Inferior Trunks (serve Posterior compartments of Arm and Forearm)

Muscles of Anterior Compartment (Flexors!) Muscles of Posterior Compartment (Extensors!) Arm (brachial a. ):

Muscles of Anterior Compartment (Flexors!) Muscles of Posterior Compartment (Extensors!) Arm (brachial a. ): Biceps Brachii Brachialis Coracobrachialis Arm (radial a. ): Triceps Brachii Forearm (ulnar a. ): Flexor carpi radialis Flexor carpi ulnaris * Flexor carpi dititorum superficialis Palmaris longus Pronator teres Forearm (radial a. ): Brachioradialis ⌂ Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digit minimi Extensor carpi ulnaris Anconeus Superficial muscles Abductor pollicus longus ‡ Extensor pollicus brevis ‡ Extensor pollicus longus ‡ Extensor indicus Supinator † Deep muscles Flexor digitorum profundus ** Flexor pollicus longus Pronator quadratus † * Innervated by ulnar nerve ** Half innervated by ulnar nerve † Exception to compartment rule ⌂ Flexor when forearm ½ pronated ‡ Tendons form “snuffbox” Superficial muscles Deep muscles