muscles of the pectoral region

Question 1

what are the muscles of the pectoral region?

Answer 1

• pectoralis major
• pectoralis minor
• serratus anterior
• subclavius

Question 2

1. what is the origin of pectoralis major?
2. what is the insertion of pectoralis major?
3. what is the action of pectoralis major?
4. what is the innervation of pectoralis major?

Answer 2

1. clavicle and sternum
2. interubercular sulcus
3. sternal head = adducts arm, medially rotates + draws scapula anteroinferiorly clavicular head = flex upper limb
4. lateral and medial pectoral nerves

Question 3

1. what is the origin of pectoralis minor?
2. what is the insertion of pectoralis minor?
3. what is the action of pectoralis minor?
4. what is the innervation of pectoralis minor?

Answer 3

1. 3rd-5th rib
2. coracoid process
3. draw scapula ateroinferiorly
4. medial pectoral nerve

Question 4

1. what is the origin of serratus anterior?
2. what is the insertion of serratus anterior?
3. what is the action of serratus anterior?
4. what is the innervation of serratus anterior?

Answer 4

1. ribs 1-8
2. scapula
3. rotates scapula
4. long thoracic nerve

Question 5

1. what is the origin of subclavius?
2. what is the insertion of subclavius?
3. what is the action of subclavius?
4. what is the innervation of subclavius?

Answer 5

1. 1st rib
2. clavicle
3. anchors clavicle
4. nerve to subclavius