Pectoral and scapular region

Question 1

What are the 4 muscles in the anterior chest?

Answer 1

• Subclavius
• Pectoralis Major
• Pectoralis Minor
• Serratus anterior

Question 2

What does the Subclavius move?

Answer 2

Moves the clavicle

Question 3

What innervates the subclavius?

Answer 3

Nerve to subclavius

Question 4

What is the origin and insertion of the subclavius?

Answer 4

• Origin is at the first 1st costal cartilage
• Inserts into the lower border of the clavicle

Question 5

What is the function of the subclavius?

Answer 5

Stabilises/ depresses the clavicle

Question 6

What moves the humerus?

Answer 6

Pectoralis Major

Question 7

What innervates the pectoralis major?

Answer 7

The median and Lateral pectoral nerves

Question 8

What are the two heads of the pectoralis major?

Answer 8

-Clavicular head
- Sternocostal head

Question 9

Where does the clavicular head of the pectoralis major attach?

Answer 9

On the medial third of the clavicle

Question 10

Where does the sternocostal head of the pectoralis major?

Answer 10

Attaches to the upper six ribs

Question 11

Where do the pectoralis major muscle heads converge?

Answer 11

Both head come down and converge on the lateral lip of the intertubercular sulcus of the humerus

Question 12

Describe the function of the pectoralis major?

Answer 12

• Powerful adductor of the glenohumeral joint
• Clavicular head can also aid in shoulder flexion
• In a flexed position, the lower fibres of the pectoralis major (sternocostal head) can also extend the shoulder (only as far as the anatomical position)

Question 13

What does the pectoralis minor move?

Answer 13

The scapula

Question 14

What innervates the pectoralis minor?

Answer 14

Medial Pectoral Nerve

Question 15

What is the origin of the pectoralis minor?

Answer 15

The 3rd, 4th and 5th ribs

Question 16

What is the insertion of the pectoralis minor

Answer 16

Into the coracoid process of the scapula

Question 17

What is the function of pectoralis minor?

Answer 17

To stabilise the scapula as the elbow and shoulder move around

Question 18

What does the serratus anterior move?

Answer 18

The scapula

Question 19

What innervates the serratus anterior?

Answer 19

Long thoracic nerve

Question 20

What is the origin of the serratus anterior?

Answer 20

Upper nine ribs

Question 21

What is the insertion of the serratus anterior?

Answer 21

Wraps around the body wall and inserts onto the medial border of the scapula

Question 22

What is the function of the serratus anterior?

Answer 22

Protracts
Prevents winging
Scapular rotation

Question 23

Describe the arterial supply of the pectoral regions

Answer 23

• Suprascapular artery
• Dorsal scapular artery
• Subscapular artery

Question 24

Describe the venous drainage of the pectoral regions

Answer 24

Drainage into the subclavian or axillary veins

Question 25

What are the 3 extrinsic back muscles?

Answer 25

- Latissimus Dorsi -Trapezius - Rhomboids

Question 26

What does the latissimus dorsi move?

Answer 26

Moves the humerus

Question 27

What innervates the latissimus Dorsi

Answer 27

Thoracodorsal Nerve

Question 28

What is the origin of the latissimus dorsi?

Answer 28

Attaches to spinous processes of T8-T12 via the Thoracolumbar fascia

Question 29

What is the insertion of the latissimus dorsi?

Answer 29

Inserts into the floor of the intertubercular sulcus between the 2 lips

Question 30

What is the function of the latissimus dorsi?

Answer 30

-Extends - Abducts - Medially rotates

Question 31

What does the trapezius move?

Answer 31

The scapula

Question 32

What innervates the trapezius?

Answer 32

The spinal accessory nerve roots C4 C5 Only muscle of the upper limb not innervated by brachial plexus

Question 33

What is the origin of the trapezius?

Answer 33

To the base of the skull at external occipital protuberance, nuchal ligament and spinous processes of C7 - T12

Question 34

Where is the insertion of the Trapezius?

Answer 34

The acromion, spine of the scapula and clavicle

Question 35

What is the function of the trapezius?

Answer 35

* Superior part elevates scapula * Middle part retracts scapula * Inferior part depresses scapula

Question 36

What do the rhomboids move?

Answer 36

Scapula

Question 37

What innervates the rhomboids?