Anatomy: Pectoral Region Muscles

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3 Different types of Ribs

1. True Ribs (1-8)- Articulate Directly with Sternum 2. False Ribs (9-12)- Articulate only with costal cartilage of above ribs. 3. Floating ribs (11-12)- Articulate with vertebrae only

What is found in the triangle?

ACDP Acromial branch Clavicular branch Deltoid branch Pectoral branch

pectoralis minor

Attaches Scapula to Axial skeleton

Promixal Artery to ThoracoAcromial Trunk

Axillary Artery

Why is the Medial Pectoral Nerve called medial?

Because it is medial to the lateral vein in their origin at the Brachial Plexus.

serratus anterior

Boxer's Muscle

Vein that superficially separates the Deltoid and Pectoralis Major?

Cephalic Vein

Anatomy of Proximal Humerus

Humeral Head intertubercular groove Greater & Lesser Tuberosity Surgical Neck Anatomical Head Deltoid Tuberosity

subclavius insertion

Inferior surface of clavicle (subclavian groove)

pectoralis minor origin

Ribs 3-5

subclavius

Round muscle hidden/protected by clavicle

Clavicle

Sternal end Acromial end

What is proximal to the Axillary Artery?

Subclavian Artery Subclavian => Axillary => Brachial Artery

pectoralis minor insertion

coracoid process of scapula

pectoralis major insertion

lateral lip of intertubercular groove of humerus

serratus anterior innervation

long thoracic nerve (C5-7)

pectoralis minor innervation

medial pectoral nerve C8-T1 pierces and innervates

pectoralis major origin

medial third of clavicle (clavicular head) sternum ribs 2-6 (sternocostal head) Costal/Abdominal Head

subclavius innervation

nerve to the subclavius (C 5-6)

serratus anterior function

protracts scapula and holds it against thoracic wall inferior fibers rotate the scapula and move the glenoid fossa superiorly (upward scapula rotation) when abducting arm above shoulder

serratus anterior origin

ribs 1-8

pectoralis minor function

•Scapular depression (Pulls tip of Scapula down) •Scapular protraction (with other muscles)

What does ACDP attach to promixaly?

ThoracoAcromial Trunk/Artery (Yellow)

pectoralis major innervation

Clavicular head - lateral pectoral nerve C5-7 Sternocostal head - medial pectoral nerve C8-T1

Important Aspects of Manubrium

Jugular Notch Clavicular Notch Sternal Angle- Angle of Louis

subclavius origin

Junction of 1st rib and costal cartilage

3 Parts of the Sternum

Manubrium Sternum Body Xyphoid Proces

serratus anterior insertion

anterior surface of medial border of scapula

Anatomical Landmark of Pectoral Deltoid Region

clavipectoral triangle or Deltopectoral Triangle

subclavius function

•Depresses the clavicle •Protracts the clavicle •Shunts clavicle towards axial skeleton with powerful movements of the UE •Throwing •Punching

Proximal Humerus

•Greater tuberosity •Lesser tuberosity •Intertubercular (bicipital) groove •Lateral lip: attachment site of pectoralis major

pectoralis major function

•Horizontal adduction of arm •Flexion of arm •Internal rotation of arm


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