2nd Order- #2 Pectoral Region and Axilla

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Last updated 4:16 PM on 9/23/26
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8 Terms

1
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Pectoralis Major M

Function: Agonist of arm flexion; adducts arm; medially rotates arm


Innervation: Lateral pectoral (C5-C7) and medial pectoral (C8-T1) nerves


Attachments:

P: Medial clavicle; costal cartilages of ribs 2-6; body of sternum

D: Lateral Part of intertubercular sulcus of humerus

<p>Function: <span style="color: red;">Agonist </span>of arm flexion; adducts arm; medially rotates arm</p><p></p><p>Innervation: Lateral pectoral (C5-C7) and medial pectoral (C8-T1) nerves</p><p></p><p>Attachments:</p><p>P: Medial <span style="color: red;">clavicle</span>; costal cartilages of <span style="color: red;">ribs 2-6</span>; body of <span style="color: red;">sternum</span></p><p>D: Lateral Part of intertubercular sulcus of <span style="color: red;">humerus</span></p>
2
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Cephalic Vein

3
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Pectoralis Minor M

function: protracts scapula; depresses scapula


innervation: medial pectoral nerve (C8-T1)

<p>function: protracts scapula; depresses scapula </p><p></p><p>innervation: medial pectoral nerve (C8-T1)</p>
4
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Medial and lateral pectoral NN

5
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Thoracoacromial A and its pectoral branch

6
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Brachial Plexus

Lateral Cord: Musculocutaneous N, Median N

Median Cord: Ulnar N, Median N

Posterior Cord: Upper Subscapular N, Thoracodorsal N, Lower Subsapular N, Axillary N, Radial N

7
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Long Thoracic N

8
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Axillary A branches into

Thoracoacromial A, Lateral Thoracic A, Subscapular A w/ thoracodorsal A and circumflex scapular A branches, Posterior Humeral circumflex A, Anterior humeral circumflex A