Anatomy Brachial Plexus videos + notes

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thoracodorsal n supplies

latissimus dorsi

what innervates the serratus anterior

long thoracic n

innervation of subscapular

lower subscapular

innervation of teres major

lower subscapular

what innervates teres majo

lower subscapular

what innevates the lower part of the subscapularis and teres major

lower subscapular

musculocutaneous n is motor to - sensory to -

m - anterior flexors of arm s - arm and lateral forearm

what does medial brachial innervate

medal brachial skin

what cord does the ulnar nerve come from

medial

what supplies pectoralis major

medial AND lateral pectoral nn.

what are the preterminal branches of the medial cord

medial brachial, medial antebrachial cutaneous, medial pectoral

what are the branches of the medial cord

medial cutaneous brachial medial cutaneous antebrachial medial pectoral ulnar

what supplies pectoralis minor

medial pectoral

what nerve innervates the radial 2 lumbricals

median

what nerve innervates the skin of the palmar aspect of the radial 3.5 digits

median

what nerve innervates the skin of the thumb side of the palm

median

sensory innervation - median vs ulnar

median: lateral 3.5 fingers, palmar surface, superiodorsal aspect of fingers (fingertips) ulnar: dorsal and palmar aspect of medial 1.5 fingers, just below fingertips

the musculocutaneous nerve innervates (m and s)

muscles of anterior arm skin of lateral aspect of arm

the lateral cord gives off the lateral root of the median nerve and then continues as the - n.

musculocutaneous

branches of the brachial plexus and the cords they originate from

musculocutaneous from lateral cord median nerve from lateral and medial cords axillary and radial nn. from posterior cord ulnar nerve from medial cord "MARMU"

what nerve is likely injured if the patient cant flex elbow

musculocutaneous n

what cord does the axillary nerve come from

posterior

what cord does the radial nerve come from

posterior

the - cord terminates by dividing into the axillary and radial nerves

posterior cord

where does the lower subscapular nerve originate

posterior cord

where does the thoracodorsal nerve originate

posterior cord

where does the upper subscapular nerve originate

posterior cord

the posterior cord is formed by what division(s)

posterior divisions of all trunks (superior, middle, inferior)

where do the preterminal branches of the posterior cord innervate

posterior muscles of the axilla (upper and lower subscapular, thoracodorsal)

where does the suprascapular nerve originate supplies:

superior trunk supraspinatus, infraspinatus mm.

the axillary and radial nerves contain fibers from which trunks

superior, middle and inferior - contains the posterior divisions of all of them.

what innervates supraspinatus and infraspinatus

suprascapular n

what innervates latissimus dorsi

thoracodorsal

what nerve innervates all of the interossei

ulnar

what nerve innervates flexor carpi ulnaris

ulnar

what nerve innervates the adductor pollicis

ulnar

what nerve innervates the deep head of the flexor pollicis brevis

ulnar

what nerve innervates the ulnar half of the flexor digitorum profundus

ulnar

if - nerve is injured, the thumb CAN still flex/oppose, but the fingers can't be abducted or adducted

ulnar n

the medial cord gives off the medial root of the median nerve and then continues as the -

ulnar n.

subscapularis is innervated by

upper and lower subscapular

what are the preterminal branches of the posterior cord

upper and lower subscapular, thoracodorsal

what innervates the upperpart of the subscapularis muscle

upper subscapular n.

what are the branches of the posterior cord

upper subscapular, thoracodorsal, lower subscapular terminates as axillary and radial

what emerge from the scalene interval

ventral rami and trunks of the plexus, subclavian artery

what spinal nerves innervate the triceps and extensors of the wrist and fingers

C7 (6,8)

- dermatome = ulnar 2 digits, medial aspect of hand and wrist

C8

what spinal nerves innervate the thumb muscles

C8

what spinal nerves are responsible for flexion of wrist and fingers

C8 (7, T1)

what cord does the musculocutaneous nerve come from

lateral

the median nerve is given off by what cords

lateral and medial

the anterior divisions of the trunks form - cords

lateral and medial cords

where does the lateral pectoral nerve originate

lateral cord

what cords give off the median nerve

lateral cord gives lateral root, medial cord gives off medial root

what is the only preterminal branch of the lateral cord

lateral pectoral n.

- dermatome = middle finger, middle of hand

C7

- dermatome = shoulder pad area

C4

- dermatome = lateral aspect of arm and elbow

C5

what spinal nerves provide innervation to deltoid and other intrinsic muscles of the shoulder

C5, 6

what spinal nerves are responsible for elbow flexion and supination of forearm

C5,6

what spinal nerves provide innervation to biceps, brachialis, and supinator

C5,6

what spinal nerves are responsible for shoulder abduction, hyperextension, and external rotation

C5,6 (intrinsic muscles of shoulder, deltoid)

- dermatome = lateral aspect of forearm and hand, radial 2 digits

C6

what spinal nerves innervate the pronators (internal rotators) of the forearm

C6,7,(8)

- dermatome = medial aspect of forearm, elbow, lower arm

T1

what spinal nerves are responsible for finger adduction/abduction

T1

what spinal nerves innervate the little finger muscles and interossei

T1

- dermatome = medial aspect of upper arm

T2

the musculocutaneous, median, and ulnar nerves arise from anterior/posterior divisions of the trunks

anterior (flexors)

course of musculocutaneous n

anterior arm, exits lateral forearm

the medial cord is formed by what division(s)

anterior division of the inferior cord

the - will innervate the anterior or flexor muscles, while the - will innervate the posterior or extensor muscles of the upper limb

anterior divisions posterior divisions

course of median nerve

anterior to elbow, between heads of pronator teres

what nerve supplies teres minor

axillary

what nerve supplies the deltoid

axillary

what nerve supplies the skin over the insertion of the deltoid

axillary

scalene interval =

between anterior and middle scalene mm, first rib

median vs ulnar claw hand

distal median n. injury: loss of 2 lateral lumbricals, patient asked to open fist, but 2nd and 3rd stay flexed proximal median: patient tries to punch, ends up "blessing"; loss of thumb opposition, lateral lumbricals stay flexed ulnar: loss of medial lumbricals, can't extend 4th or 5th digits, can't abduct or adduct fingers

innervation of levator scapulae

dorsal scapular

innervation of rhomboids

dorsal scapular

what innervates the rhomboids and levator scapulae

dorsal scapular

median nerve is motor to

forearm: lateral flexors except FCU (ulnar n.) hand: lateral 2 lumbricals, thenar eminence via recurrent branch

what nerve innervates the radial 3.5 digits proximal to the IP joints

radial

what nerve supplies the skin of the lateral 2/3 of hand

radial

where does the phrenic nerve originate

root of C3,4,5

what is the root of the dorsal scapular n? dorsal scapular n. innervates:

root of C5 supplies levator scapulae, rhomboids

where does the long thoracic nerve originate

roots of C5,6,7

explain the roots, trunks, divisions, and cords of the brachial plexus

roots: spinal nerves C5-T1 trunks: superior = C5,C6, middle = C7, inferior = C8,T1 divisions: anterior division of superior trunk continues as lateral cord; anterior division of inferior trunk continues as medial cord; the posterior divisions of all 3 superior, middle, inferior trunks come together and form the posterior cord cords: superior trunk becomes the lateral cord, middle trunk becomes the posterior cord, inferior trunk becomes medial cord

what does antebrachial cutaneous innervate

skin of anterior forearm

what does the lower subscapular supply

subscapular and teres major

upper subscapular n supplies

subscapularis m

the anterior divisions of the - and - trunks join to become the lateral cord

superior and middle


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