Axilla - Brachial Plexus Flashcards
Dorsal scapular nerve roots?
C5
Long thoracic nerve roots?
C5 - C7
Suprascapular nerve roots?
C5, C6
Subclavian nerve roots?
C5, C6
Lateral pectoral nerve roots?
C5-C7
Medial Pectoral nerve roots?
C8, T1
Medial brachial cutaneous nerve roots?
T1
Medial Antebrachial cutaneous nerve roots?
C8, T1
Upper subscapular nerve roots?
C5, C6
Thoracodorsal (middle subscapular) nerve roots?
C6-C8
***C6 is an inconsistent contributor
Lower subscapular nerve root?
C5, C6
Musculocutaneous nerve roots?
C5-C7
Axillary nerve roots?
C5, C6
Radial nerve roots?
C5-C8, T1
***all brachial plexus nerve roots, BUT T1 IS INCONSISTENT CONTRIBUTOR
Ulnar nerve roots?
C8, T1
Median nerve roots?
C5-C8, T1
Cords of the brachial plexus are named in reference to the…
axillary artery
Roots pass between the…
anterior and middle scalene muscles
Divisions occur as the plexus passes behind the…
clavicle
the “M” in the brachial plexus is made up of what terminal nerves?
Musculocutaneous, median, ulnar
(all anterior branches)
Suprascapular nerve is going to run through what part of the scapula?
Suprascapular notch (superior notch)
Musculocutaneous nerve pierces what muscle and then travels where?
pierces the coracobrachialis muscle
travels inferior between the biceps brachii and brachialis
The musculocutaneous nerve continues as the…
Lateral antebrachial cutaneous nerve
Musculocutaneous nerve innervates…
anterior compartment of arm (biceps brachii, brachialis, coracobrachialis)
skin of the lateral aspect of the forearm (bc it continues as the LABC n)
The axillary nerve travels posteriorly with what artery in what space?
Posterior circumflex humeral artery
Quadrangular space
The axillary nerve continues as the…
Lateral brachial cutaneous nerve
Axillary nerve innervates…
deltoid, teres minor, GH joint
skin over superolateral arm (deltoid area)
The radial nerve enters the radial groove on the posterior humerus along with the…
deep (profunda) brachial artery
What nerve branches off of the radial nerve around mid-shaft of posterior humerus?
Posterior antebrachial cutaneous nerve
Radial nerve branches into the…
superficial and deep branches of the radial nerve
The deep branch of the radial nerve becomes the __________ once it passes the __________ in the forearm
Posterior (dorsal) Interosseous nerve
inferior border of the supinator muscle
Radial nerve innervates…
posterior compartments of the arm and forearm
skin of posterior and inferolateral arm
skin of dorsum of hand (lateral to the axial line of digit 4)
Median nerve travels with what artery?
Brachial artery
Median nerve lies _______ to the brachial artery in the ________ fossa
Medial
Cubital fossa
What nerve branches off the median nerve?
anterior interosseous nerve
Median nerve innervates…
all flexor mm in forearm (EXCEPT the FCU and medial 2 tendons of FDP)
lateral 2 tendons of FDP
5 intrinsic muscles in thenar portion of the hand
lateral palmar skin (lateral to the axial line of digit 4)
Ulnar nerve runs down medial aspect of arm posterior to the _________ of the humerus
medial epicondyle
Ulnar nerve innervates…
FCU
Medial 2 tendons (ulnar half) of flexor digitorum profundus
most intrinsic mm of the hand
medial palmar skin (medial to the axial line of digit 4)
Dorsal medial to digit 3
Lateral pectoral nerve passes _______ to the axillary artery
anterior
Lateral pectoral nerve communicates with the _______ via a communicating branch
Medial pectoral nerve
Lateral pectoral nerve innervates…
pec major muscle (clavicular head)
Medial pectoral nerve travels between the _______ and _______
axillary artery
axillary vein
Medial pectoral nerve innervates…
pec minor (sternocostal head)
Medial pectoral nerve pierces what muscle?
pec minor
Medial brachial cutaneous nerve travels with the _______ on the medial side of the arm
axillary vein
Medial brachial cutaneous nerve supplies…
skin of medial arm
Medial antebrachial cutaneous nerve supplies…
skin of medial forearm
Medial antebrachial cutaneous nerve initially runs with the ______ and is often confused with it
ulnar nerve
Medial antebrachial cutaneous nerve travels between the…
axillary artery and vein
Upper subscapular nerve innervates…
superior portion of the subscapularis
Lower subscapular nerve innervates:
inferior portion of subscapularis
teres major
Lower subscapular nerve travels deep to what artery?
subscapular artery
Thoracodorsal (middle subscapular) nerve runs inferolaterally along posterior axillary wall with the…
thoracodorsal artery
Thoracodorsal nerve innervates…
latissimus dorsi
C5, C6
Suprascapular
Subclavian
Upper subscapular
Lower subscapular
Axillary
C5, C6, C7
Long thoracic
Lateral pectoral
Musculocutaneous
C8, T1
Medial pectoral
Medial antebrachial cutaneous
Ulnar
C5-C8, T1
Radial
Median
Union of C5 & C6 roots
superior trunk
Continuation of C7 root
Middle trunk
Union of C8 & T1 roots
Inferior trunk
Anterior divisions supply the
anterior compartment of the arm & forearm
Posterior divisions supply the
posterior compartment of the arm & forearm
Anterior & posterior divisions are named in reference to the…
axillary artery
Anterior divisions of the superior & middle trunks form the
lateral cord
Anterior divisions of the inferior trunk continues as the
Medial cord
Posterior divisons of all 3 trunks unite to form the
posterior cord
Lateral pectoral n. arises from
lateral cord
Medial pectoral n. arises from
medial cord
Terminal branch of the lateral cord
musculocutaneous n.
Terminates from a combination of the lateral and medial cords
median n.
Terminal branch from the medial cord
ulnar n.
Smaller terminal branch of the posterior cord
axillary n.
Largest terminal branch of the posterior cord
radial n.
Branch of the lateral cord
lateral pectoral n.
Branch of the medial cord
medial pectoral n.
2 branches of the medial cord
- medial brachial n.
- medial antebrachial cutaneous n.
