Muscles of the Arm Flashcards Preview

ESA 2- Musculoskeletal System > Muscles of the Arm > Flashcards

Flashcards in Muscles of the Arm Deck (42):
1

What is the anatomical arm?

The shoulder joint to the elbow joint

2

What muscles are in the anterior arm?

Biceps brachii
Brachialis 
Coracobrachialis

3

What muscles are in the posterior arm?

Triceps
Anconeus

4

What are muscles in the anterior compartment of the arm innervated by?

The musclocutaneous nerve

5

What kind of muscle is the biceps brachii?

Two headed

6

Where is nearly all the muscle mass of the biceps located?

Anterior to the humerus

7

Does the biceps have an attachment to the humerus?

No

8

How is the muscle belly of the biceps brachii formed?

By the combination of the two heads

9

Where do the two heads of the biceps brachii combine?

At the level of the humeral shaft

10

How do the two heads of the biceps brachii combine?

The tendon of the long head passes through the shoulder joint and intertubercular groove of the humerus to meet the short head

11

What is the biceps brachii innervated by?

Musculocutaneous nerve (C5-7)

12

What does a tap on the biceps tendon test?

Spinal cord segment C6

13

What is the arterial supply of the biceps brachii?

Brachial artery

14

What is the action of the biceps brachii?

Supinates forearm, and when it is supine, flexes forearm 
Short head resists dislocation of the shoulder

15

What happens as the biceps tendon enters the forearm?

A connective tissue sheet is given off, called the bicipital aponeurosis

16

What does the bicipital aponeurosis form?

The roof of the cubital fossa

17

What does the bicipital aponeurosis blend with?

The deep fascia of the anterior forearm

18

How common is a complete rupture of a body tendon?

Rare

19

What is one of more common tendons to rupture?

The long head of the biceps tendon

20

What does the rupture of the biceps tendon produce?

A characteristic bulge where the muscle belly is on flexing at the elbow, called the ‘Popeye Sign '

21

Would a patient with a rupture of the biceps tendon notice much weakness in the upper limb?

No, due to the action of the brachialis and supinator muscles

22

Where does the coracobrachialis muscle lie?

Deep to the biceps brachii in the arm

23

Where does the coracobrachialis pass?

Through the axilla

24

What is the innervation of the coracobrachialis?

Musculocutaneous nerve (C5, C6, C7)

25

What is the arterial supply of the coracobrachialis?

Brachial artery

26

What is the function of the coracobrachialis?

Helps flex and adduct the arm 
Resists dislocation of the shoulder

27

Where does the brachialis muscle lie?

Deep to the biceps brachii, more distally than the other muscles of the arm

28

What does the brachialis form?

The base of the cubital fossa

29

What is the innervation of the brachialis?

Musculocutaneous nerve (C5, C6)
Small lateral portion by radial nerve (C5, C7)

30

What is the arterial supply of the brachialis?

Brachial artery
Radial recurrent artery

31

What is the action of the brachialis?

Flexes forearm in all positions

32

What does the triceps brachii have?

Three heads

33

Where does the medial head of the triceps lie?

Deeper than the other two

34

When is the medial head visible?

When the other two heads have been dissected away

35

What happens to the three heads of the triceps brachii?

They combine to make one muscle and converge to a tendon

36

What is the innervation of the triceps brachii?

Radial nerve (C6-8)

37

What is the arterial supply of the triceps brachii?

Deep brachial artery

38

What is the action of the triceps brachii?

Chief extensor of forearm 
Long head resists dislocation of humerus 
Especially important during adduction

39

What does a tap on the triceps tendon test?

Spinal segment C7

40

What is the innervation of the anconeus?

Radial nerve (C7, C8, T1)

41

What is the arterial supply of the anconeus?

Recurrent interosseous artery

42

What is the action of the anconeus?

Assists triceps in extending the forearm 
Stabilises elbow joint 
May abduct ulna during pronation