Pectoral Region

Question 1

Name muscles of pectoral region?

Answer 1

1. Pectoralis Major
2. Pectoralis Minor
3. Subclavius
4. Serratus Anterior

Question 2

Which muscles form anterior wall of axilla?

Answer 2

Pectoralis major and minor

Question 3

Pectoralis major and minor form anatomy of?

Answer 3

Breast

Question 4

Which nerve innervate pectoralis major and minor?

Answer 4

Major
Median and lateral pectoral nerves (branches of brachial plexus)

Minor
Only median

Question 5

What structures does the pectorals are in close relation with?

Answer 5

1.The brachial plexus
2.Subclavian artery
3.Subclavian vein
(All run between the muscle and ribcage)

Question 6

What is action of pectoralis major?

Answer 6

Adduction and medial rotation of arm

Clavicular fibres - flex the arm

Lifts the trunk when inhaling

Question 7

Which muscle is known as breast stroke muscle?

Answer 7

Pectoralis major

Question 8

Which muscle causes retroversion (outward rotation) of upper arm?

Answer 8

Pectoralis major

Question 9

What are the functions of pectoralis minor?

Answer 9

Elevates the ribs (3rd - 5th) when fixed scapula

Depression of point of shoulder

Question 10

Location of pectoralis minor?

Answer 10

Under pectoralis major

Question 11

How many parts of pectoralis major? What are their function? Opposite and together?

Answer 11

2 heads:
1.Clavicular head (flexes humerus)
2. Sternocostal head(extension of humerus back to anatomical position)

Work opposite to each other
But when work together perform:

1. Adduction of humerus
2. Medial or internal rotation of humerus

Question 12

What is the origin of and insertion of pectoralis major?

Answer 12

origin
Clavicle
Sternum + upper 6 costocartilage

Insertion
Lateral lip of bicipital groove of humerus (intertubercular groove)

Question 13

Pectoralis major gets its blood supply from which artery?

Answer 13

Thoracoacromial artery

Question 14

Medial and lateral pectoral nerves are branches of?

Answer 14

Brachial plexus

Question 15

Thoracoacromial artery is a branch of?

Answer 15

Axillary artery

Question 16

Pectoralis minor is inserted into?

Answer 16

Coracoid process of scapula

Question 17

Difference of nerve supply of pectoralis major and minor?

Answer 17

Major:
Median + lateral nerve of brachial plexus

Minor:
Only median

Question 18

The origin and insertion of pectoralis minor?

Answer 18

Origin
3rd, 4th and 5th ribs

Insertion
Corocoid process of scapula

Question 19

Origin of subclavius?
And insertion?

Answer 19

Origin

1st rib (costal cartilage)

Insertion
Clavicle

Question 20

What passes under the subclavius?

Answer 20

1. Brachial plexus
2. Subclavius Artery
3. Subclavius vein

Question 21

What is subclavius muscle innervated by?

Answer 21

Nerve to subclavius (from the upper trunk of brachial plexus)

Question 22

Location of subclavius muscle?

Answer 22

Underneath the pectoralis major

Question 23

Subclavian nerve originates from which part of brachial plexus?

Answer 23

Upper trunk

Question 24

Artery which supply subclavius?

Answer 24

Two:
1. Thoracoacromial artery (branch of axillary artery)

2. Suprascapular artery
   (Branch of subclavian artery)

Question 25

Function of subclavius?

Answer 25

1. Depresses clavicle and stabilizes it 2. Elevation of 1st rib

Question 26

Origin and insertion of serratus anterior?

Answer 26

**origin** Upper 8 ribs **Insertion** Medial border and inferior angle of scapula

Question 27

Serratus anterior is innervated by?

Answer 27

Long Thoracic nerve ( branch of brachial plexus)

Question 28

Function of serratus anterior?

Answer 28

Rotataion of scapula

Question 29

Location of serratus anterior?

Answer 29

Lateral aspect of thoracic wall Major portion lies under scapula and pectoral muscles

Question 30

Paralysis of serratus anterior causes?

Answer 30

Winged scapula- protrusion of scapula

Question 31

What is arterial supply of serratus anterior?

Answer 31

1. Superior Thoracic Artery 2. Lateral Thoracic Artery 3. Thoracodorsal Artery

Question 32

The most superficial muscle in the pectoral region?

Answer 32

Pectoralis Major

Question 33

Clavicular head of pectoralis major originates from?

Answer 33

Anterior surface of **medial clavicle**

Question 34

Sternoclavicular head of pectoralis major originates from?

Answer 34

1. Anterior surface of sternum. 2. Superior **6 costal cartilages** 3. Aponeurosis of **external Oblique muscle**

Question 35

What part of pectoralis major flexes the arm?

Answer 35

Clavicular fibres