Brachial Plexus — Extended Schematic Map (GEAR) Topological metro-style map of the brachial plexus, GEAR-branded. The Brachial Plexus ROOTS TRUNKS DIVISIONS CORDS TERMINAL NERVES NAMED SUB-BRANCHES → Contribution to phrenic nerve (C5) Dorsal scapular nerve (C5) Long thoracic nerve (C5–C7) Suprascapular nerve (C5–C6) Nerve to subclavius (C5–C6) Lateral pectoral nerve (C5–C7) Upper subscapular nerve (C5–C6) Thoracodorsal nerve (C6–C8) Lower subscapular nerve (C5–C6) Medial pectoral nerve (C8–T1) Medial brachial cutaneous nerve (T1) Medial antebrachial cutaneous nerve (C8–T1) T2 (2nd intercostal) Intercostobrachial nerve C5 C6 C7 C8 T1 SUPERIOR MIDDLE INFERIOR ANTERIOR POSTERIOR ANTERIOR POSTERIOR ANTERIOR POSTERIOR LATERAL CORD POSTERIOR CORD MEDIAL CORD MUSCULOCUTANEOUS (C5–C7) AXILLARY (C5–C6) MEDIAN (C5–T1, dual root: lateral + medial cord) RADIAL (C5–T1) ULNAR (C8–T1) Muscular branches → biceps brachii, brachialis, coracobrachialis Lateral cutaneous nerve of the forearm Anterior branch → motor (anterior + middle deltoid) + cutaneous to anterior & anterolateral shoulder Posterior branch → teres minor, posterior deltoid, and Superior lateral brachial cutaneous nerve Articular branches → posterior glenohumeral joint capsule Muscular branches → pronator teres, FCR, palmaris longus, FDS Anterior interosseous nerve Palmar cutaneous branch → thenar & palm skin Recurrent motor branch → thenar muscles Common & proper palmar digital nerves Muscular branches (arm) → triceps brachii, anconeus + posterior cutaneous branches (brachial, lower lateral, antebrachial) Muscular branches (forearm) → brachioradialis, ECRL Deep branch → Posterior interosseous nerve (motor to wrist/finger extensors, articular to wrist) Superficial branch → Superficial radial nerve (articular branches to elbow joint) Muscular branches (forearm) → FCU, medial half of FDP Palmar cutaneous branch → hypothenar palm skin Dorsal cutaneous branch Deep branch → intrinsic hand motor (hypothenar, interossei, adductor pollicis, 3rd/4th lumbricals) Superficial branch → palmaris brevis (motor) + palmar digital n. to 5th & medial half of 4th finger INTERSCALENE BLOCK SUPERIOR TRUNK BLOCK SSN BLOCK SUPRACLAVICULAR BLOCK INFRACLAVICULAR BLOCK COSTOCLAVICULAR BLOCK AXILLARY BLOCK AXILLARY N. BLOCK ITM PLANE BLOCK ICBN BLOCK MID-HUMERAL MED ELBOW RAD ELBOW ULN ELBOW LCNF BLOCK MED FA ULN FA RAD FA PIN BLOCK DIGITAL BLOCK BLOCK COLOR LEGEND Interscalene Superior trunk Suprascapular n. Supraclavicular Infraclavicular Costoclavicular Axillary BPB Axillary n. ITM plane Intercostobrachial Mid-humeral Median at elbow Radial at elbow Ulnar at elbow LCNF (terminal MCN) Median at forearm Ulnar at forearm Radial at forearm PIN (deep radial) Digital nerve block