Pectoral region

Question 1

Where is the pectoral region located?

Answer 1

The anterior chest wall

Question 2

How many muscles make up the pectoral region?

Answer 2

4

Question 3

List the muscles that comprise the pectoral region

Answer 3

Pectoralis Major
Pectoralis Minor
Serratus Anterior
Subclavius

Question 4

Which muscle in the pectoral region is most superficial?

Answer 4

Pectoralis Major

Question 5

How many heads does the pectoralis major have?

Answer 5

Two, they fan out in opposite directions.

Question 6

What is the function of the pectoralis major?

Answer 6

Adducts and medially rotates the upper limb.
Draw a the scapular antero-inferiorily.
The clavicle head acts to flex the upper limb.

Question 7

What nerve innervates the pectoralis major?

Answer 7

Lateral and medial pectoral nerves

Question 8

The intertubercular sulcus of humerus is the site of insertion of what part of what muscle?

Answer 8

Distal attachments of both heads of the pectoralis major.

Question 9

Which part of the pectoralis major originates from the sternum, the 6 superior costal cartilages and the aponeurosis of the external oblique muscles?

Answer 9

Sternocostal head

Question 10

What’s the origin of the clavicle head of the pectoralis major?

Answer 10

Anterior surface of the medial clavicle

Question 11

The anterior wall of the Axilla is comprised of which two muscles?

Answer 11

Pectoralis major and minor

Question 12

Which is muscle is deeper the pectoralis major or minor?

Answer 12

Minor

Question 13

Where does the pectoralis minor insert?

Answer 13

3rd-5th rib origin

Cor acid process of the scapula.

Question 14

What’s the function of the pectoralis minor?

Answer 14

Stabilise the scapula by drawing it antero-inferiorly against the thoracic wall

Question 15

What nerve innervates the pectoralis minor?

Answer 15

Medical pectoral nerve

Question 16

What muscle rotates the scapula allowing the arm to be raised over 90 degrees and holds the scapula against the rib cage?

Answer 16

Serratus anterior

Question 17

Which muscle originates from lateral aspects of ribs 1-8 and attach at the rib facing medial scapula border?

Answer 17

Serratus Anterior

Question 18

What muscle in the pectoral region is innervates by the long thoracic nerve?

Answer 18

Serratus anterior

Question 19

Describe the Subclavius.

Answer 19

A small muscle located just under the clavicle. The uncle runs horizontally and helps protect the neurovascular structures just deep to it.
The muscle is innervates by the nerve to Subclavius and anchors and depressed the clavicle.
Attaches at the junction of the first rib and costal cartilage and runs t the inferior surface of the middle third of the clavicle.

Question 20

What can a winged scapula indicate?

Answer 20

The scapula sticks out as its no longer held to the rib cage. This indicates the serratus anterior is defective which could be due to damaged thoracic nerve.

Question 21

What is the most common cause of thoracic nerve damage?

Answer 21

Traction injury, pulling the arm so it’s stretched and pulled violently.