Pec Girdle

What are the 3 parts of the sternum

manubrium, body, xiphoid process

Pectoral major muscle proximal attachment Clavicular head

Anterior surface of medial half of clavicle

Pectoral major muscle proximal attachment Sternocostal head

Anterior surface of sternum, superior six costal cartilages, aponeurosis of external obliques muscle

Pectoral is major muscle distal attachment

Lateral hip of inter tubercle sulcus of humerus

Innervation of pectoral is major

Lateral and medial pectoral nerve; Clavicular head C5 and C6

Sternocostal head C7 C8 T1

Main action of pectoralis major

Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly

Acting alone, clavicular head flexes humerus and sternocostal head extends it from the flexed position

Pectoralis Minor Proximal Attachment

3rd-5th ribs near their costal cartilages

Pectoralis Minor Distal Attachment

Medial border and superior surface of coracoid process of scapula

Pectorlis Minor Innervation

C8 and T1 Medial pectoral nerve

Main Action of Pectoralis Minor

Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Sub Clavius Proximal Attachemnt

Junction of 1st rib and its costal cartilage

Sub-Clavius Distal Attachment

Inferior surface of middle third of clavicle

subclavius innervation

C5-C6 nerve to subclavius

Subclavius Action

Anchors and depresses clavicle

Serrated Anterior proximal attachment

External Surfaces of lateral parts of 1st-8th ribs

Serrated Anterior Distal Attachment

Anterior Surface of medial border of scapula

serratus anterior innervation

C5, C6, C7; long thoracic nerve

Serrated Anterior Main action

Protracts scapula and holds it against thoracic wall; rotates scapula

Where does the subclavian artery become the axillary artery?

lateral border of the first rib

Where does axiliary artery becomes the brachial artery

Border of trees major

1st branch of axillary artery

superior thoracic artery

2nd part of axillary artery

thoracoacromial trunk and lateral thoracic artery

3rd part of axillary artery

Subscapular artery, anterior circumflex humeral artery, posterior circumflex humeral artery

lateral pectoral nerve

1

medial pectoral nerve

2

Hilton's law states that __________.

any nerve serving a muscle that produces movement at a joint also innervates the joint and the skin over the joint