Brachial Plexus Flashcards
What does the dorsal scapular nerve innervate?
rhomboids, levator scapulae
What is the origin of the dorsal scapular nerve?
posterior aspect of anterior ramus C5 with a frequent contribution from C4
What is the origin of the long thoracic nerve?
posterior aspect of anterior rami of C5, C6, and C7
What does the long thoracic nerve innervate?
serratus anterior
What is the origin of the suprascapular nerve?
superior trunk, receiving fibers from C5, C6, and often C4
What does the suprascapular nerve innervate?
supraspinatus and infraspinatus; glenohumeral joint
What is the origin of the subclavian nerve?
superior trunk, receiving fibers from C5, C6, and often C4
What are the supraclavicular branches of the brachial plexus?
dorsal scapular, long thoracic, suprascapular, and subclavian
What is the origin of the lateral pectoral nerve?
side branch of lateral cord, receiving fibers from C5, C6, and C7
What is the origin of the musculotaneous nerve?
terminal branch of lateral cord, receiving fibers from C5-C7
What is the origin of the median nerve?
lateral root: terminal branch of lateral cord (C6, C7 fibers)
medial root: terminal branch of medial cord(C8, T1 fibers)
What is the origin of the medial pectoral nerve?
side branch of medial cord, receiving fibers from C8 and T1
What is the origin of the medial cutaneous nerve of the arm?
side branch of medial cord, receiving fibers from C8 and T1
What is the origin of the median cutaneous branch of the forearm?
side branch of medial cord, receiving fibers from C8 and T1
What is the origin of the ulnar nerve?
larger terminal branch of medial cord, receiving fibers from C8, T1, and often C7
What is the origin of the upper subscapular nerve?
side branch of posterior cord, receiving fibers from C5
What is the origin of the lower subscaplar nerve?
side branch of posterior cord, receiving fibers from C6
What is the origin of the thoracodorsal nerve?
side branch of posterior cord, receiving fibers from C6, C7, and C8
What is the origin of the axillary nerve?
terminal branch of posterior cord, receiving fibers from C5 and C6
What is the origin of the radial nerve?
larger terminal branch of posterior cord, receiving fibers from C5-T1
What is the largest branch of the brachial plexus?
radial nerve
What does the lateral pectoral nerve innervate?
pectoralis major
What does the musculotaneous nerve innervate?
muscles of anterior compartment of arm (coracobrachialis, biceps brachii, and brachialis); skin of lateral aspect of forearm
What does the median nerve innervate?
muscles of anterior forearm compartment (except for flexor carpi ulnaris and ulnar half of flexor digitorum profundus); five intrinsic muscles in half of palm and palmer skin
What does the medial pectoral nerve innervate?
pectoralis minor and sternocostal part of pectoralis major
What does the medial cutaneous nerve of arm innervate?
skin of medial side of arm
What does the median cutaneous nerve of forearm innervate?
skin of medial side of forearm
What does the ulnar nerve innervate?
flexor carpi ulnaris and ulnar half of flexor digitorum profundus; most instrisic muscles of hand; skin of hand medial to axial line of digit 4
What does the upper subscapular nerve innervate?
superior portion of subscapularis
What does the lower subscapular nerve innervate?
inferior portion of subscapularis and teres major
What does the thoracodorsal nerve innervate?
lattisimus dorsi
What does the axillary nerve innervate?
glenohumeral joint, teres minor and deltoid muscles, skin of superolateral arm (over inferior deltoid)
What does the radial nerve innervate?
all muscles of posterior compartmentsof arm and forearm; skin of posterior and inferolateral arm, posterior forearm, and dorsum of hand lateral to axial line of digit 4
