Pectoral region, Anterior aspect of arm and shoulder joint

Question 1

Answer 1

Pectoralis major muscle

Question 2

How many muscles are in the Pectoral region?

Answer 2

2 muscles

Question 3

Answer 3

Pectoralis major muscle

Question 4

What’s the origin of the Pectoralis major muscle?

Answer 4

Sternal → sternum 2-6 ribs
Clavicular → sternal half of clavicle

Question 5

What’s the insertion of the Pectoralis major muscle?

Answer 5

Bicipital groove

Question 6

What’s the function of the Pectoralis major muscle?

Answer 6

Adduction, Medial rotation, Flexion to shoulder joint. The shoulder joint is a spheroid joint that creates 3 movements.

Question 7

What’s the nerve passing the Pectoralis major muscle?

Answer 7

Medial, lateral pectoral nerve

Question 8

Answer 8

Pectoralis Minor muscle

Question 9

What’s the origin of the Pectoralis Minor muscle?

Answer 9

3,4,5 ribs

Question 10

What’s the insertion of the Pectoralis Minor muscle?

Answer 10

Corocoid process

Question 11

What’s the function of the Pectoralis Minor muscle?

Answer 11

Pulls the shoulder towards the chest. If the shoulder is fixed the ribs are pushed towards the shoulder (forced inspiration/breathing)

Question 12

What’s the nerve passing through the Pectoralis Minor muscle?

Answer 12

Medial pectoral nerve

Question 13

What must be done to see the Pectoralis Minor muscle?

Answer 13

Dissect the Pectoralis major in half

Question 14

Answer 14

Pectoralis minor muscle

Question 15

Answer 15

Serratus Anterior Muscle

Question 16

What’s the origin of the Serratus Anterior Muscle?

Answer 16

anterior and lateral aspect of 1-8 ribs

Question 17

What’s the insertion of the Serratus Anterior Muscle?

Answer 17

Medial border, inferior angle of scapula

Question 18

What’s the function of the Serratus Anterior Muscle?

Answer 18

Pulls the medial angle of the scapula towards the chest wall, turns the glenoid cavity upwards (hyper-abduction)

Question 19

What’s the nerve passing the Serratus Anterior Muscle?

Answer 19

Long thoracic nerve

Question 20

Answer 20

Serratus Anterior Muscle

Question 21

Answer 21

Wing scapula

Question 22

Explain the wing of scapula and how is it checked.

Answer 22

When the long thoracic nerve is damaged. Tell the patient to bend on the wall and if one is winged then the patient has a wing scapula which means that the scapula isn’t applied to the thorax wall.

Question 23

Answer 23

Long and short head of bicep brachii muscle (superficial layer)

Question 24

Answer 24

Brachialis muscle (deep layer)

Question 25

Answer 25

Corocobrachialis muscle

Question 26

Answer 26

Bicep brachii muscle

Question 27

What’s the origin of the Bicep brachii muscle?

Answer 27

long head: supraglenoid tubercle
short head: corocoid processand pectoralis minor

Question 28

What’s the insertion of the Bicep brachii muscle?

Answer 28

Radial tuberosity

Question 29

What’s the function of the Bicep brachii muscle?

Answer 29

Supination of the forearm, flexion of the forearm, flexion the arm

Question 30

What’s the nerve passing the Bicep brachii muscle?

Answer 30

muculocutaneous nerve

Question 31

What’s the origin of the Corocobrachialis muscle?

Answer 31

corocoid process

Question 32

What’s the insertion of the Corocobrachialis muscle?

Answer 32

Medial aspect of humerus

Question 33

What’s the function of the Corocobrachialis muscle?

Answer 33

Adduction, Medial rotation, and flexion of the arm

Question 34

What’s the nerve passing the Corocobrachialis muscle?

Answer 34

muculocutaneous nerve

Question 35

What’s the origin of the Brachialis muscle?

Answer 35

Anterior aspect of humerus

Question 36

What’s the insertion of the Brachialis muscle?

Answer 36

Coronoid process of ulna

Question 37

What’s the function of the Brachialis muscle?

Answer 37

flexion to the forearm

Question 38

What’s the nerve passing the Brachialis muscle?

Answer 38

muculocutaneous nerve

Question 39

What muscles does the musculocutaneous nerve pass?

Answer 39

Corocobrachilais muscle, Bicep brachii muscle and Brachialis muscle

Question 40

What type of nerve is the muculocutaneous nerve?

Answer 40

Mixed nerve (motor fibers and sensory fibers)

Question 41

Question 42

What does the muculocutaneous nerve pierce?

Answer 42

Corocobrachialis muscle

Question 43

What happens when there is a musculocutaneous nerve palsy (doesnt work)?

Answer 43

Weakness of the elbow flexion(forearm) (due to brachialis and bicep brachii muscle)
Weakness of the forearm supination (due to bicep brachii muscle)
Numbness in the lateral aspect of the forearm

Question 44

Why will there be only WEAKNESS of the forearm supination during musculocutaneous nerve palsy?

Answer 44

Only weakness, not loss because there’s another muscle called the supinator muscle.