Pectoral Region

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1. clavicle 2. jugular notch 3. manubrium of sternum 4. sternal angle (2nd costal cartilage) 5. body of sternum 6. xiphoid process of sternum 7. nipple (4th intercostal space) 8. ribs of pectoral region

CUTANEOUS NERVES OF THE PECTORAL REGION MEDIAL, INTERMEDIATE & LATERAL SUPRACLAVICULAR NERVES (branches of cervical plexus C3-4) A.

B. ANTERIOR & LATERAL CUTANEOUS BRANCHES OF THE 2ND TO 6TH INTERCOSTAL NERVES C. INTERCOSTABRACHIAL NERVE

ANTERIOR & LATERAL CUTANEOUS

MUSCLES OF THE PECTORAL REGION Pectoralis major  Origin medial 1/2 of the clavicle, manubrium & body of sternum, costal cartilages of ribs 2-6, sometimes from the rectus sheath of the upper abdominal wall Insertion crest of the greater tubercle of the humerus 

Action

flexes and adducts the arm, medially rotates the arm

Innervation

medial and lateral pectoral nerves (C5-T1) Artery pectoral branch of the thoracoacromial trunk Latin, pectus = breast bone)

pectoralis minor   

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Origin : ribs 3-5 Insertion :coracoid process of the scapula Action :draws the scapula forward, medialward, and downward Innervation :medial pectoral nerve (C8, T1) Artery :pectoral branch of the thoracoacromial trunk

SUBCLAVIUS  

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ORIGIN: First rib at the costochondral junction INSERTION: Subclavian group in the middle 1/3 rd of the clavicle ACTION: Steadies the clavicle during movements of the shoulder INNERVATION: Nerve to subclavius.

SERRATUS ANTERIOR  

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Origin :ribs 1-8 or 9 Insertion :medial border of the scapula on its costal (deep) surface Action :it draws the scapula forward; the inferior fibers rotate the scapula superiorly Innervation :long thoracic nerve (from ventral rami C5-C7) Artery :lateral thoracic a.

HORIZONTAL SECTION THROUGH THE AXILLA SHOWING THE POSITION OF THE SERRATUS ANTERIOR

CLAVIPECTORAL FASCIA Defination: Extension: above –from clavicle below- to axillary fascia medially- to 1st rib la terally- to coracoid process & blends with coracoclavicular ligament Encloses: above= subclavius below- pectoralis minor Pierced by: lateral pectoral nerve cephalic vein thoracoacromial vessels lymphatics passing from the breas t & pectoral region

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