Brachial Plexus And Nerves Of Upper Limb (Infraclavicular And Supraclavicular Branches) Flashcards
Musculocutaneous nerve Origin? Course? Innervates?
O: Terminal branch of lateral cord, receiving fibers from C5-C7
Innervates: Muscle of anterior compartment of arm (coracobrachialis, biceps brachii, and brachialis); skin of lateral aspect of forearm.
Lateral pectoral nerve Origin? Course? Innervates?
O: Side branch of lateral cord, receiving fibers from C5, C6, C7
Innervates: Primarily pectoralis major, but some lateral pectoral nerve fibers pass to pectoralis minor via branch to medial pectoral nerve.
Median nerve Origin? Course? Innervates?
O: Lateral root of median nerve is a terminal branch of lateral cord (C6, C7 fibers); medial root of median nerve is a terminal branch of medial cord (C8, T1 fibers)
Innervates: Muscles of anterior forearm compartment (except for flexor carpi ulnaris and ulnar half of flexor digitorum profundus), five intrinsic muscles in thenar half of palm and palmar skin.
Medial pectoral nerve Origin? Course? Innervates?
O: Side branches of medial cord, receiving fibers from C8 and T1
Innervates: Pectoralis minor and sternocostal part of pectoralis major
Medial cutaneous nerve of arm Origin? Course? Innervates?
O: Side branches of medial cord, receiving fibers from C8 and T1
Innervates: Skin on medial side of arm, as far distal as medial epicondyle of humerus and olecranon of ulna
Median cutaneous nerve of forearm Origin? Course? Innervates?
O: Side branches of medial cord, receiving fibers from C8 and T1
Innervates: Skin of medial side of forearm, as far distal as wrist
Ulnar nerve Origin? Course? Innervates?
O: Large terminal branch of medial cord, receiving fibers from C8, T1, and often C7
Innervates: Flexor carpi ulnaris and ulnar half of flexor digitorum profundus (forearm); most intrinsic muscles of hand medial to axial line of digit 4
Upper subscapular nerve Origin? Innervates?
O: Side branch of posterior cord, receiving fibers from C5
Innervates: Superior portion of subscapularis
Lower subscapular nerve Origin? Course? Innervates?
O: Side branch of posterior cord, receiving fibers from C6
Innervates: Inferior portion of subscapularis and teres major
Thoracodorsal nerve Origin? Course? Innervates?
O: Side branch of posterior cord, receiving fibers from C6-C8
Innervates: Latissimus dorsi
Axillary nerve Origin? Course? Innervates?
O: Terminal branch of posterior cord, receiving fibers from C5 and C6
Innervates: Glenohumeral joint; teres minor and deltoid muscles; skin of superolateral arm (over inferior part of deltoid)
Radial nerve Origin? Course? Innervates?
O: Larger terminal branch of posterior cord (largest branch of plexus), receiving fibers from C5-T1
Innervates: All muscles of posterior compartments of arm and forearm; skin of posterior and inferolateral arm, posterior forearm, and dorsum of hand lateral to axial line of digit 4
Dorsal scapular nerve Origin? Innervates?
O: Posterior aspect of anterior ramus of C5, frequent contribution of C4
Innervates: Rhomboids; occasionally supplies levator scapulae
Long thoracic nerve Origin? Innervates?
O: Posterior aspect of anterior rami of C5,C6,C7
Innervates: Serratus Anterior
Suprascapular Origin? Innervates?
O: Superior trunk, receiving fibers from C5,C6 often C4
Innervates: Supraspinatus and infraspinatus; glenohumeral joint
