Muscles of the Arm Flashcards Preview

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Flashcards in Muscles of the Arm Deck (55):
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

What is the proximal attachment of the long head of the biceps brachii?

Supraglenoid tubercle of the scapula

9

What is the proximal attachment of the short head of the biceps brachii?

Tip of coracoid process of scapula

10

How is the muscle belly of the biceps brachii formed?

By the combination of the two heads

11

Where do the two heads of the biceps brachii combine?

At the level of the humeral shaft

12

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

13

What is the distal attachment of the biceps brachii?

Tuberosity of the radius and fascia of the forearm, via bicipital aponeurosis

14

What is the biceps brachii innervated by?

Musculocutaneous nerve (C5-7)

15

What does a tap on the biceps tendon test?

Spinal cord segment C6

16

What is the arterial supply of the biceps brachii?

Brachial artery

17

What is the action of the biceps brachii?

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

18

What happens as the biceps tendon enters the forearm?

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

19

What does the bicipital aponeurosis form?

The roof of the cubital fossa

20

What does the bicipital aponeurosis blend with?

The deep fascia of the anterior forearm

21

How common is a complete rupture of a body tendon?

Rare

22

What is one of more common tendons to rupture?

The long head of the biceps tendon

23

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 '

24

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

25

Where does the coracobrachialis muscle lie?

Deep to the biceps brachii in the arm

26

Where is the proximal attachment of the coracobrachialis?

Tip of the coracoid process of scapula

27

Where does the coracobrachialis pass?

Through the axilla

28

Where is the distal attachment of the coracobrachialis?

Middle third of the medial surface of the humerus, at the level of the deltoid tubercle

29

What is the innervation of the coracobrachialis?

Musculocutaneous nerve (C5, C6, C7)

30

What is the arterial supply of the coracobrachialis?

Brachial artery

31

What is the function of the coracobrachialis?

Helps flex and adduct the arm 
Resists dislocation of the shoulder

32

Where does the brachialis muscle lie?

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

33

What does the brachialis form?

The base of the cubital fossa

34

What is the proximal attachment of the brachialis?

Distal half of anterior surface of humerus

35

What is the distal attachment of the brachialis?

Coronoid process
Tuberosity of ulna

36

What is the innervation of the brachialis?

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

37

What is the arterial supply of the brachialis?

Brachial artery
Radial recurrent artery

38

What is the action of the brachialis?

Flexes forearm in all positions

39

What does the triceps brachii have?

Three heads

40

Where does the medial head of the triceps lie?

Deeper than the other two

41

When is the medial head visible?

When the other two heads have been dissected away

42

What is the proximal attachment of the long head of the triceps?

Infraglenoid tubercle of the scapula

43

What is the proximal attachment of the lateral head of the triceps brachii?

Posterior surface of the humerus, superior to radial groove

44

What is the proximal attachment of the medial head of the triceps brachii?

Posterior surface of the humerus, inferior to the radius groove

45

What happens to the three heads of the triceps brachii?

They combine to make one muscle and converge to a tendon

46

What is the distal attachment of the triceps brachii?

Proximal end of the olcranon of ulna
Fascia of forearm

47

What is the innervation of the triceps brachii?

Radial nerve (C6-8)

48

What is the arterial supply of the triceps brachii?

Deep brachial artery

49

What is the action of the triceps brachii?

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

50

What does a tap on the triceps tendon test?

Spinal segment C7

51

What is the proximal attachment of the anconeus?

Lateral epicondyle of humerus

52

What is the distal attachment of the anconeus?

Lateral surface of olecranon and superior part of posterior surface of ulna

53

What is the innervation of the anconeus?

Radial nerve (C7, C8, T1)

54

What is the arterial supply of the anconeus?

Recurrent interosseous artery

55

What is the action of the anconeus?

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