Pectoral Muscles Flashcards
What are the two heads of pec major?
- Clavicular
- Sternocostal
What three muscles are located in each pectoral region?
- Pectoralis Major
- Pectoralis Minor
- Subclavius
What are the functions of pec major?
- ADduction
- Medial Rotation
- Flexion at shoulder joint
What is the function of pec minor?
- Depress tip of shoulder
- Protract Scapula
Where is pec minor located?
-Underneath pec major, running superiolaterally
Where does pec minor insert?
-Coracoid process of scapula
What nerves innervate pec major?
-Medial and lateral pectoral nerves
What innervates pec minor?
-Medial pectoral nerve
What are the three main structures of the axilla?
- Axillary Artery
- Axillary Vein
- Brachial Plexus
What is the function of subclavius?
-Pull clavicle medially, stabilising sternoclavicular joint
Where is subclavius located?
-Immediately inferior clavicle
What is the function of serratus anterior?
- Pulls scapula forward
- Facilitates rotation
What innervates serratus anterior?
-Long thoracic nerve
Where do breast tumours arise from in the pectoral region?
-Cells of acini, lactiferous ducts and lobules of the breast
