Axillary artery and brachial plexus

Thoraco-acromial = Runs anteromedially along superior border of pectoralis minor; then passes between it and pectoralis major to thoracic wall; helps supply 1st and 2nd intercostal spaces and superior part of serratus anterior Lateral thoracic = Descends along axillary border of pectoralis minor; follows it onto thoracic wall, supplying lateral aspect of breast Circumflex humeral = Encircle surgical neck of humerus, anastomosing with each other laterally; larger posterior branch traverses quadrangular space Subscapular = Curls around superomedial border of pectoralis minor; pierces costo-coracoid membrane (clavipectoral fascia); divides into four branches: pectoral, deltoid, acromial, and clavicular

Thoraco-acromial = Curls around superomedial border of pectoralis minor; pierces costo-coracoid membrane (clavipectoral fascia); divides into four branches: pectoral, deltoid, acromial, and clavicular Lateral thoracic = Runs anteromedially along superior border of pectoralis minor; then passes between it and pectoralis major to thoracic wall; helps supply 1st and 2nd intercostal spaces and superior part of serratus anterior Circumflex humeral = Descends along axillary border of pectoralis minor; follows it onto thoracic wall, supplying lateral aspect of breast Subscapular = Encircle surgical neck of humerus, anastomosing with each other laterally; larger posterior branch traverses quadrangular space

Thoraco-acromial = Helps supply 1st and 2nd intercostal spaces and superior part of serratus anterior Lateral thoracic = Supplies lateral aspect of breast Circumflex humeral = Anastomoses with each other laterally; larger posterior branch traverses quadrangular space Subscapular = Pierces costo-coracoid membrane (clavipectoral fascia)

<p>Helping to supply the 1st and 2nd intercostal spaces</p> Signup and view all the answers

<p>Circumflex humeral artery</p> Signup and view all the answers

<p>Subscapular artery</p> Signup and view all the answers

<p>It curves around the lateral border of the scapula to enter the infraspinous fossa</p> Signup and view all the answers

<p>Thoraco-acromial artery</p> Signup and view all the answers

<p>The thoracodorsal artery continues the course of the subscapular artery</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>False</p> Signup and view all the answers

<p>False</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>Thoraco-acromial artery</p> Signup and view all the answers

<p>Thoraco-acromial artery</p> Signup and view all the answers

<p>Circumflex scapular artery</p> Signup and view all the answers

<p>Thoracodorsal artery</p> Signup and view all the answers

<p>Lateral thoracic artery</p> Signup and view all the answers

<p>Thoracodorsal artery</p> Signup and view all the answers

<p>Superior thoracic = Runs anteromedially along superior border of pectoralis minor; then passes between it and pectoralis major to thoracic wall; helps supply 1st and 2nd intercostal spaces and superior part of serratus anterior Thoraco-acromial = Curls around superomedial border of pectoralis minor; pierces costo-coracoid membrane (clavipectoral fascia); divides into four branches: pectoral, deltoid, acromial, and clavicular Lateral thoracic = Descends along axillary border of pectoralis minor; follows it onto thoracic wall, supplying lateral aspect of breast Circumflex humeral = Curves around lateral border of scapula to enter infraspinous fossa, anastomosing with suprascapular artery</p> Signup and view all the answers

<p>Subscapular = Descends from level of inferior border of subscapularis along lateral border of scapula, dividing within 2-3 cm into terminal branches, the circumflex scapular and thoracodorsal arteries Thoracodorsal = Continues course of subscapular artery, descending along lateral border of scapula Axillary = Runs along axillary border of pectoralis minor; then passes between it and pectoralis major to thoracic wall Brachial = Near its origin, superior to medial epicondyle of humerus</p> Signup and view all the answers

<p>Superior thoracic = Only branch of the first part of the axillary artery Thoraco-acromial = Divides into four branches: pectoral, deltoid, acromial, and clavicular Lateral thoracic = Largest branch of any part of the axillary artery Subscapular = Gives rise to circumflex scapular and thoracodorsal arteries</p> Signup and view all the answers

<p>Dorsal scapular = Pierces middle scalene; descends deep to levator scapulae and rhomboids Long thoracic = Passes through cervico-axillary canal, descending posterior to C8 and T1 roots of plexus Suprascapular = Descends posterior to clavicle and anterior to brachial plexus and subclavian artery Subclavian nerve = Passes laterally across lateral cervical region, superior to brachial plexus</p> Signup and view all the answers

<p>Dorsal scapular = Serratus anterior Long thoracic = Rhomboids; occasionally supplies levator scapulae Suprascapular = Supraspinatus and infraspinatus muscles; glenohumeral joint Subclavian nerve = Subclavius and sternoclavicular joint</p> Signup and view all the answers

<p>Dorsal scapular = Superior trunk, receiving fibers from C5, C6, and often C4 Long thoracic = Posterior aspect of anterior rami of C5, C6, C7 Suprascapular = Posterior aspect of anterior ramus of C5 with a frequent contribution from C4 Subclavian nerve = Superior trunk, receiving fibers from C5, C6, and often C4</p> Signup and view all the answers

<p>Dorsal scapular = Passes through scapular notch inferior to superior transverse scapular ligament Long thoracic = Runs inferiorly on superficial surface of serratus anterior Suprascapular = Pierces middle scalene; descends deep to levator scapulae and rhomboids Subclavian nerve = Passes laterally across lateral cervical region, superior to brachial plexus</p> Signup and view all the answers

<p>Dorsal scapular = Gives an accessory root to phrenic nerve Long thoracic = Runs inferiorly on superficial surface of serratus anterior Suprascapular = Innervates supraspinatus and infraspinatus muscles Subclavian nerve = Innervates subclavius and sternoclavicular joint</p> Signup and view all the answers

<p>Dorsal scapular = Innervates rhomboids; occasionally supplies levator scapulae Long thoracic = Innervates serratus anterior Suprascapular = Innervates supraspinatus and infraspinatus muscles; glenohumeral joint Subclavian nerve = Innervates subclavius and sternoclavicular joint</p> Signup and view all the answers

<p>Dorsal scapular nerve</p> Signup and view all the answers

<p>Long thoracic nerve</p> Signup and view all the answers

<p>Long thoracic nerve</p> Signup and view all the answers

<p>Suprascapular nerve</p> Signup and view all the answers

<p>Subclavian nerve</p> Signup and view all the answers

<p>Subclavian nerve</p> Signup and view all the answers

<p>Lateral pectoral = Side branch of lateral cord, receiving fibers from C5, C6, and C7 Medial pectoral = Side branch of medial cord, receiving fibers from C8 and T1 Musculocutaneous = Terminal branch of lateral cord, receiving fibers from C5-C7 Axillary = Side branch of posterior cord, receiving fibers from C5</p> Signup and view all the answers

<p>Musculocutaneous = Exits axilla by piercing coracobrachialis and descends between biceps brachii and brachialis Median = Descends through arm adjacent to brachial artery, with nerve gradually crossing anterior to artery to lie medial to artery in cubital fossa Lateral pectoral = Pierces costocoracoid membrane to reach deep surface of pectoral muscles Axillary = Courses through the quadrangular space bounded by the humerus, long head of triceps, and teres minor</p> Signup and view all the answers

<p>Medial pectoral = A communicating branch to the lateral pectoral nerve passes anterior to axillary artery and vein Median = Lateral and medial roots merge to form median nerve lateral to axillary artery Musculocutaneous = Supplies both biceps brachii and brachialis Axillary = Courses with the circumflex humeral artery through the quadrangular space</p> Signup and view all the answers

<p>Musculocutaneous = Supplies both biceps brachii and brachialis Median = Supplies the thenar muscles and receives sensory input from the hand Lateral pectoral = Innervates the pectoralis major muscle Axillary = Innervates the deltoid muscle</p> Signup and view all the answers

<p>Ulnar = Larger terminal branch of medial cord, receiving fibers from C8, T1, and often C7 Radial = Larger terminal branch of posterior cord, receiving fibers from C5-T1 Median = Lateral root is a terminal branch of lateral cord (C6, C7), and medial root is a terminal branch of medial cord (C8, T1) Axillary = Side branch of posterior cord, receiving fibers from C5 and C6</p> Signup and view all the answers

<p>Median = Descends through arm adjacent to brachial artery, with nerve gradually crossing anterior to artery to lie medial to artery in cubital fossa Ulnar = Courses medially between the medial epicondyle of the humerus and the medial head of the triceps Radial = Courses laterally between the lateral epicondyle of the humerus and the lateral head of the triceps Axillary = Courses through the quadrangular space bounded by the humerus, long head of triceps, and teres minor</p> Signup and view all the answers

<p>Medial pectoral nerve = Pectoralis minor and sternocostal part of pectoralis major Lateral pectoral nerve = Muscles of anterior compartment of arm and skin of lateral aspect of forearm Intercostobrachial nerve = Skin of medial side of arm and olecranon of ulna Medial brachial cutaneous nerve = Skin of medial side of forearm and wrist</p> Signup and view all the answers

<p>Ulnar nerve = Initially runs with medial brachial cutaneous nerve but pierces deep fascia with basilic vein Medial pectoral nerve = Passes between axillary artery and vein; then pierces pectoralis minor and enters deep surface of pectoralis major Lateral pectoral nerve = Descends medial arm; passes posterior to medial epicondyle of humerus Radial nerve = Exits axillary fossa posteriorly, passing through quadrangular space with posterior circumflex humeral artery</p> Signup and view all the answers

<p>Lateral pectoral nerve = Initially runs with ulnar nerve Medial pectoral nerve = Communicates with intercostobrachial nerve Ulnar nerve = Pierces deep fascia with basilic vein Radial nerve = Gives rise to superior lateral brachial cutaneous nerve</p> Signup and view all the answers

<p>Medial brachial cutaneous nerve = Cubital fossa Ulnar nerve = Ulnar aspect of forearm and hand Radial nerve = Posterior and inferolateral arm, posterior forearm, and dorsum of hand Lateral pectoral nerve = Anterior compartment of arm</p> Signup and view all the answers

<p>Lateral pectoral nerve = Coracobrachialis, biceps brachii, and brachialis Medial pectoral nerve = Pectoralis major and minor Radial nerve = Flexor carpi ulnaris and ulnar half of flexor digitorum profundus Ulnar nerve = Most intrinsic muscles of hand and skin of hand medial to axial line of digit 4</p> Signup and view all the answers

<p>Lateral pectoral nerve = Pierces deep surface of pectoralis major Medial pectoral nerve = Passes posterior to medial epicondyle of humerus Ulnar nerve = Runs along medial side of axillary and brachial veins Radial nerve = Perforates lateral intermuscular septum</p> Signup and view all the answers

<p>Subscapularis</p> Signup and view all the answers

<p>Ulnar nerve</p> Signup and view all the answers

<p>Posterior to humerus in radial groove</p> Signup and view all the answers

<p>Medial cutaneous nerve of the arm</p> Signup and view all the answers

<p>They communicate with each other</p> Signup and view all the answers

<p>Medial pectoral nerve</p> Signup and view all the answers

<p>Terminal branch of lateral cord (C6, C7)</p> Signup and view all the answers

<p>Exits axilla by piercing coracobrachialis and descends between biceps brachii and brachialis</p> Signup and view all the answers

<p>The medial root is a terminal branch of the medial cord, and the lateral root is a terminal branch of the lateral cord</p> Signup and view all the answers

<p>Terminal branch of medial cord (C8, T1)</p> Signup and view all the answers

<p>Descends through arm adjacent to brachial artery, with nerve gradually crossing anterior to artery to lie medial to artery in cubital fossa</p> Signup and view all the answers

<p>The lateral and medial roots merge to form the median nerve</p> Signup and view all the answers