Muscles of the Pectoral Region

Question 1

Pectoralis Major (Image)

Answer 1

Question 2

Pectoralis Major: Origin and Insertion

Answer 2

Origin: Medial part of clavicle, sternum, costal cartilages of ribs 2-5 and upper rectus sheath

Insertion: greater tubercular crest of humerus

Question 3

Pectoralis Major: Action

Answer 3

Adduction, medial rotation, and flexion of arm at shoulder joint

Question 4

Pectoralis Major: Innervation

Answer 4

Medial and lateral pectoral nerves

Question 5

Pectoralis major: blood supply

Answer 5

Thoracoacromial Trunk

lateral Thoracic Artery

Perforating Intercostal Branches

Anterior perforating branches of the internal thoracic artery

Question 6

Pectoralis Minor( Image)

Answer 6

Deep to pec major

Question 7

Pec Minor: Origin and Insertion

Answer 7

Origin: From ribs 2-4 or 3-5

Insertion: On coracoid process of scapula

Question 8

Pec Minor: Innervation

Answer 8

Medial pectoral nerve

Question 9

Subclavius Muscle (Image)

Answer 9

Question 10

Subcl Muscle: Origin and Insertion

Answer 10

From junction of the 1st rib with its cartilage

Insertion: on the inferior surface of the clavicle

Question 11

Subcl Muscle: Action

Answer 11

Depresses clavicle

Question 12

Subcl Muscle: Innervation

Answer 12

Upper trunk of the brachial plexus