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Brachial Plexus

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ethan1's version from 2017-08-16 11:38

 

Question Answer
name the 4 plexusescervical, brachial, lumbar, sacral
the cervical plexus contains _________ rami of what spinal nerves?ventral primary rami C1-C4
the brachial plexus contains _________ rami of what spinal nerves?ventral primary rami C5-T1
the lumbar plexus contains _________ rami of what spinal nerves?ventral primary rami L1-L4
the sacral plexus contains _________ rami of what spinal nerves?ventral primary rami L4-S3
# roots, names5 (C5-T1)
# trunks, names3 - upper (C5 & C6), middle (C7), lower (C8 & T1)
# divisions, names6 - anterior & posterior for each trunk
# cords, names3 - lateral (upper ant & middle ant), posterior (all 3 post divisions), medial (lower ant)
cords are named by their positions relative toaxillary artery
# terminal branches, names5 (musculocutaneous, axillary, radial, median, ulnar)
supraclavicular group includes what sections of the brachial plexus?Roots (ventral primary rami C5-T1), Trunks (upper, middle, lower)
retroclavicular group includes what sections of the brachial plexus?Divisions (ant/posterior for each trunk)
define retroclavicularbehind the clavicle
infraclavicular group includes what sections of the brachial plexus?Cords, Branches (minus 4 supraclavicular branches)
4 supraclavicular brancheslong thoracic, dorsal scapular, suprascapular, nerve to subclavius
superior rami of brachial plexusC5, C6
intermediate rami of brachial plexusC6, C7, C8
inferior rami of brachial plexusC8, T1
proximal muscles of the upper limb are innervated by (S/Int/Inf) ramisuperior (C5, C6)
proximal muscles of the upper limb act atpectoral girdle and shoulder
muscles that act at the elbow and wrist are innervated by (S/Int/Inf) ramiintermediate (C6, C7, C8)
distal muscles of the upper limb are innervated by (S/Int/Inf) ramiinferior (C8, T1)
distal muscles of the upper limb act atdigits & thumb
anterior division fibers innervate _________ muscles that act mainly as (flexors/extensors)muscles in anterior arm, anterior forearm, hand ... flexors
5 branches that contain anterior division fibersmusculocutaneous, ulnar, median, lateral pectoral, medial pectoral
posterior division fibers innervate _________ muscles that act mainly as (flexors/extensors)muscles in posterior arm, posterior forearm.... extensors
5 branches that contain posterior division fibersradial, axillary, upper subscapular, thoracodorsal, lower subscapular
memorize

segmental (ventral rami) contributions to branches

Question Answer
dorsal scapular nerveC5
suprascapular nerveC5, C6
nerve to subclaviusC5, C6
lateral pectoral nerveC5, C6, C7
musculocutaneous nerveC5, C6, C7
upper subscapular nerveC5, C6
thoracodorsal nerve(C6), C7, C8
lower subscapular nerveC5, C6
medial pectoral nerveC8, T1
medial brachial cutaneous nerveC8, T1
medial antebrachial cutaneous nerveC8, T1
radial nerveC5, C6, C7, C8, (T1)
axillary nerveC5, C6
median nerve(C5), C6, C7, C8, T1
ulnar nerve(C7), C8, T1
long thoracic nerveC5, C6, C7
memorize

expected segmental contributions that aren't normally there

Question Answer
branches C5 doesn't contribute tothoracodorsal & median
branches C6 doesn't contribute tothoracodorsal
branches C7 doesn't contribute toupper subscapular, lower subscapular, axillary
branches C8 doesn't contribute toupper subscapular, lower subscapular, axillary
branches T1 doesn't contribute toposterior division of lower trunk
memorize

muscular innervation - arm

Question Answer
only nerve that supplies anterior compartment of armmusculocutaneous
only nerve that supplies posterior arm & forearmradial nerve (& branches)
only 2 nerves that innervate the anterior forearmmedian & ulnar (& branches)
supraclavicular branches (4)long thoracic, dorsal scapular, suprascapular, nerve to subclavius
long thoracic innervatesserratus anterior
serratus anterior is innervated bylong thoracic
dorsal scapular innervatesrhomboid major, rhomboid minor, levator scapulae
rhomboid major is innervated bydorsal scapular
rhomboid minor is innervated bydorsal scapular
levator scapulae is innervated bydorsal scapular
suprascapular innervatessupraspinatus, infraspinatus
supraspinatus is innervated bysuprascapular
infraspinatus is innervated bysuprascapular
nerve to subclavius innervatessubclavius
6 infracalvicular brancheslateral pectoral, medial pectoral, medial brachial cut., medial antebrachial cut., upper subscapular, lower subscapular, thoracodorsal
lateral pectoral innervatespectoralis major
medial pectoral innervatespectoralis major & minor
pectoralis major is innervated bylateral & medial pectoral nerves
pectoralis minor is innervated bymedial pectoral nerve
upper subscapular innervatesupper part of subscapularis
lower subscapular innervateslower part of subscapularis & teres major
subscapularis is innervated byupper & lower subscapular nerves
teres major is innervated bylower subscapular
thoracodorsal innervateslatissimus dorsi
latissimus dorsi is innervated bythoracodorsal
axillary nerve innervatesdeltoid & teres minor
deltoid is innervated byaxillary nerve
teres minor is innervated byaxillary nerve
musculocutaneous nerve innervatescoracobrachialis, biceps brachii, brachialis
coracobrachilais is innervated bymusculocutaneous nerve
biceps brachii is innervated bymusculocutaneous nerve
brachialis is innervated bymusculocutaneous nerve
memorize

muscular innervation - forearm & hand

Question Answer
median nerve & branches innervate what forearm muscles? (6 1/2 muscles)(1) pronator teres, (2) flexor carpi radialis, (3) palmaris longus, (4) flexor digitorum superficialis, (5) lat 1/2 flexor digitorum profundus (6) flexor pollicis longus, (7) pronator quadratus
pronator teres is innervated bymedian nerve
flexor carpi radialis is innervated bymedian nerve
palmaris longus is innervated bymedian nerve
flexor digitorum superficialis is innervated bymedian nerve
flexor digitorum profundusmedian (lat half, anterior interosseous) & ulnar nerves (med half)
flexor pollicis longus is innervated bymedian nerve (anterior interosseous)
pronator quadratus is innervated bymedian nerve (anterior interosseous)
median nerve & branches innervate what intrinsic hand muscles? (4)1/2 LOAF = (1) 1&2 lumbricals, (2) opponens pollicis, (3) abductor pollicis, (4) flexor pollicis brevis
1 & 2 lumbricals are innervated bymedian nerve
opponens pollicis is innervated bymedian nerve (recurrent branch)
abductor pollicis is innervated bymedian nerve (recurrent branch)
flexor pollicis brevis is innervated bymedian nerve (recurrent branch)
the hand is primarily innervated byulnar nerve
ulnar nerve innervates what forearm muscles? (1 1/2)flexor carpi ulnaris & med. 1/2 flexor digitorum profundus
flexor carpi ulnaris is innervated byulnar nerve
ulnar nerve innervates what intrinsic muscles of the hand? (8)(1) 3&4 lumbricals, (2) 1-4 dorsal interossei, (3) 1-3 palmar interossei, (4) aDductor pollicis, (5) palmaris brevis, (6) aBductor digiti minimi, (7) flexor digiti minimi brevis, (8) opponens digiti minimi
3 & 4 lumbricals are innervated byulnar nerve
1 - 4 dorsal interossei are innervated byulnar nerve
1 - 3 palmar interossei are innervated byulnar nerve
aDductor pollicis is innervated byulnar nerve
palmaris brevis is innervated byulnar nerve
aBductor digiti minimi is innervated byulnar nerve
flexor digiti minimi brevis is innervated byulnar nerve
opponens digiti minimi is innervated byulnar nerve
radial nerve & its branches innervate what muscles that act on elbow & forearm? (4)(1) triceps brachii, (2) anconeous, (3) brachioradialis, (4) supinator
triceps brachii is innervated byradial nerve
anconeous is innervated byradial nerve
brachioradialis is innervated byradial nerve
supinator is innervated byradial nerve (deep branch)
radial nerve & its branches innervate what muscles that act on the wrist? (3)(1) extensor carpi radialis longus, (2) extensor carpi radialis brevis, (3) extensor carpi ulnaris
extensor carpi radialis longus is innervated byradial nerve
extensor carpi radialis brevis is innervated byradial nerve
extensor carpi ulnaris is innervated byradial nerve (posterior interosseous)
radial nerve innervates what extrinsic muscles of the hand? (6)(1) extensor digitorum, (2) extensor indicis, (3) extensor digiti minimi, (4) extensor pollicis longus, (5) extensor pollicis brevis, (6) extensor pollicis brevis
extensor digitorum is innervated byradial nerve (posterior interosseous)
extensor indicis is innervated byradial nerve (posterior interosseous)
extensor digiti minimi is innervated byradial nerve (posterior interosseous)
extensor pollicis longus is innervated byradial nerve (posterior interosseous)
extensor pollicis brevis is innervated byradial nerve (posterior interosseous)
extensor pollicis brevis is innervated byradial nerve (posterior interosseous)
memorize