Chest Muscles

Question 1

Origin and name of 3 pec major heads

Answer 1

clavicular, Manubrial, Sternocostal. From upper 6 costal cartilage, medial anterior clavicle, and manubrium

Question 2

Insertion of Pec Major and tendon structure

Answer 2

Trilaminar tendon inserting into lateral bicepital groove and anterior deltoid tuberosity. Anterior part inserts into surgical neck of humerus, posterior part (costal cartilage) rounds behind and inserts into shoulder capsule.

Question 3

Nerve Supply of Pec Major

Answer 3

Medial and Lateral Pectoral Nerves C5-T1 (only muscle in upper limb innervated by all nerve roots.

Question 4

Pec Minor Origin

Answer 4

3,4,5 Ribs 2

Question 5

Insertion of Pec Minor

Answer 5

Medial border of coracoid. Importantly not the tip.

Question 6

Nerve Supply of Pec Minor

Answer 6

C6,7,8. Both medial and lateral pectoral nerves.

Question 7

Origin and insertion of subclavius

Answer 7

1st costochondral joint inserts along subclavian groove of first rib

Question 8

Innervation of subclavius

Answer 8

C5,6 has its own nerve off the superior trunk (nerve to subclavius)

Question 9

Describe the clavipectoral fascia

Answer 9

From clavicle in wraps subclavius then forms hollow above pec minor the wraps around pec minor

Question 10

Name the ligaments the clavipectoral fascia creates

Answer 10

Costocoracoid - above the pec minor
Supsensory ligament of axilla below the pec minor

Question 11

What passes through the clavipectoral fascia

Answer 11

Cephalic vein, Thoracoacromial artery, Lateral pectoral nerve, Lymphatics

Question 12

Name the branches of thoracoacromial artery

Answer 12

Humeral, clavicular, acromial, pectoral

Question 13

How do the veins pierce the clavipectoral fascia

Answer 13

They joint the cephalic before passing through. ( the opposite to the arteries)