Components (AA)
What is/are the branch(es) on the first portion of the axillary artery?
-superior thoracic artery
What muscle does the superior thoracic artery supply?
-1st and 2nd intercostal space
-subclavius mm.
The brachial plexus is made up of which of the following nerve roots (i.e. ventral rami)?
C5-T1
What root levels is the teres major innervation?
Lower subscapular n C5, C6, C7
What is/are the branch(es) on the second portion of the axillary artery?
-thoracoacromial trunk (ACDP)
-lateral thoracic artery
What muscles does the thoracoacromial branch supply?
A: acromial
C: clavicular
D: deltoid
P: pectoral
A patient presents with sensory loss in the medial aspect of the arm, medial forearm and hand. The sensory loss in the medial aspect of the hand encompasses both the dorsal and volar sides. You also note intrinsic hand weakness that is most apparent in the hypothenar (pinky side of the hand) group of muscles. This patient also presents with weakness of the pectoral muscles (pectoralis major and minor). Where is the MOST LIKELY site of the lesion within the brachial plexus?
Medial cord
What are the root levels of the deltoid innervation?
Axillary n C5, C6
What is/are the branch(es) on the third portion of the axillary artery?
-subscapular artery (scapular circumflex artery/thoracodorsal artery)
-anterior humeral circumflex
-posterior humeral circumflex
What muscles does the lateral thoracic artery supply?
-pectoralis muscles
-serratus anterior mm.
-a little of the breast
The X nerve passes through the triangular interval and it is made up of nerve root levels X and X.
radial n C6, C7, C8
What are the root levels of the coracobrachialis innervation?
Musculocutaneous n C5, C6, C7
When does the subclavian artery turn into the axillary artery?
-1st rib
What muscles does the subscapular artery supply?
thoracodorsal: latissimus dorsi
scapular circumflex: anastomoses with dorsal scapular circumflex/seen in triangular space
Name the roots, trunks, divisions, cords, branches of the brachial plexus
Roots: C5, C6, C7, C8, T1
Trunks: superior, middle, inferior
Divisions: anterior, posterior
Cords: lateral, posterior, medial
Branches: MARMU
What are the nerve root levels of the innervation of the levator scapula?
Ventral rami C3, C4 and Dorsal Scapular n C5
When does the axillary artery turn into the brachial artery?
inferior border of the teres major
What muscles do the anterior and posterior humeral circumflex arteries supply?
Anterior and posterior anastomoses with one another and supply humeral head and GH joint, deltoid
What comes off of the medial cord of the brachial plexus? (3)
medial pectoral nerve, medial antebrachial cutaneous, medial brachial cutaneous
What are the nerve root levels of the innervation of the pectoralis major?
Lateral and medial pectoral nerve
Clavicular fibers (C5, C6)
Sternal fibers (C7, C8, T1)