Living Anatomy Muscles of the Arm

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Where are the Cephalic and Basilic Vein located?

Cephalic: anterolateral surface of arm Basilic: anteromedial surface of arm

What 3 muscles make up the pyramidal wall of the Axilla? (Anterior, Posterior and Medial) What bone makes the lateral wall?

Anterior Wall: pectoralis major Posterior Wall: latissimus dorsi and teres major Medial Wall: serratus anterior and ribs 2-6 Lateral Wall: humerus

The Brachial Plexus surrounds which artery? Which 3 cords make it up?

Axillary Posterior, Lateral, Medial palpate cords in axilla (possibly)

What is the major artery that supplies blood to the upper extremity? and how do you palpate it? It's a continuation of what artery?

Axillary artery palpate deep in the axilla toward the humerus subclavian (changes to axillary artery at lateral border of 1st rib)

What is the major nerve supply to the upper extremity?

Brachial Plexus

Biceps Brachii Action

Flexion and Supination of forearm Flexion of arm Short head: also adducts

Biceps Brachii Innvervation

Musculocutaneous nerve

Upper Trapezius Origin and insertion

O: EOP, Superior Nuchal Line, Spinous process of C1-7 I: Lateral 1/3 of clavicle and acromion process

Biceps Brachii Short Head Origin and Insertion

O: coracoid process of scapula I: radial tuberosity and aponeurosis of bicipital brachii

Biceps Brachii Long Head Origin and Insertion

O: supraglenoid tubercle of scapula I: radial tuberosity and aponeurosis of bicipital brachii

Upper Trapezius Action

Scapular elevation and upward rotation Extends Head and Neck Lateral Flexion of Head and Neck to Side of contraction Rotates head and neck away from side of contraction (contralateral rotation)

Where is the subacromial bursa located and what's it's function? (non-palpable)

between the acromion and rotator cuff relieves pressure in that area

Coracobrachialis origin

coracoid process of scapula

Brachialis Origin

distal 1/2 of anterior humerus .

Triceps Brachii Action

extension of forearm long head extends and adducts arm

Corcobrachialis actions

flexion and adduction of arm

Brachialis Action

flexion of the forearm

Triceps Brachii Medial Head

inferior 2/3 of posterior humerus

Triceps Brachii Long Head Origin

infraglenoid tubercle of scapula

Brachial Artery starts where? Where do you palpate it?

lower border of teres major press on the medial border of the biceps brachii to the humerus to palpate

Coracobrachialis insertion

middle of medial shaft of humerus

Brachialis Innervation

musculocutaneous and radial nerves

Coracobrachialis Innervation

musculocutaneous nerve

Triceps Brachii Insertion

olecranon process of ulna

Triceps Brachii Innervation

radial nerve

Trapezius Innervation

spinal accessory nerve

Triceps Brachii Lateral Head

superior 1/2 of posterior lateral humerus

Axillary Lymph nodes may be palpated in what portion of the axilla? (not always palpable)

superior portion palpate towards chest wall

Brachialis Insertion

ulnar coronoid process and tuberosity


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