Arm and Cubital Fossa

Question 1

1) What is the arm also referred to as?

Answer 1

The brachium

Question 2

2) What is the region?

Answer 2

Region between the shoulder joint and the elbow

Question 3

3) What muscles are in the anterior compartment of the arm?

Answer 3

a. Biceps brachii, b. Coracobrachialis, c. Brachialis

Question 4

4) Where does the long head of the biceps brachii originate from?

Answer 4

From the supraglenoid tubercle of the scapula

Question 5

5) Where does the short head of the biceps brachii originate from?

Answer 5

From the medial side of the coracoid process

Question 6

6) Where does the long head and short head of the biceps insert?

Answer 6

They insert on the posterior portion of the radial tuberosity and also on the bicipital aponeurosis which then goes into the antebrachial fascia

Question 7

7) What are the functions of the biceps brachii?

Answer 7

a. Weak flexor at the shoulder joint
b. Strong flexor of the forearm at the elbow
c. Strong supinator of the forearm

Question 8

8) Where does the coracobrachialis originate?

Answer 8

The coracobrachialis originates with a common tendon from short of biceps brachii at the coracoid process

Question 9

9) Where does the coracobrachialis insert?

Answer 9

Coracobrachialis inserts on the anterior portion middle shaft of the humerus

Question 10

10) What is the action of the coracobrachialis?

Answer 10

a. Weak flexor of the arm at the shoulder joint

b. Weak adductor of the arm at the shoulder joint

Question 11

11) What is the origin for the brachialis muscle

Answer 11

Anterior aspect of the distal half of the humerus

Question 12

12) Where does the brachialis muscle insert?

Answer 12

Coronoid process of the ulna

Question 13

13) What is the action of the brachialis muscle?

Answer 13

Strong flexor at the elbow joint

Question 14

14) What are the 3 parts of the triceps?

Answer 14

a. long head, b. lateral head, c. medial head

Question 15

Where does the long head of the triceps originate?

Answer 15

�It originates on the infraglenoid tubercle of the scapula

Question 16

16) Where does the lateral head originate from?

Answer 16

�It originates on the superior portion above the radial groove of the humerus

Question 17

17) Where does the medial head originate?

Answer 17

�Distal portion of the radial groove of the humerus

Question 18

18) Where do all three insert?

Answer 18

� Olecranon process

Question 19

19) What passes down in the radial groove?

Answer 19

�radial nerve and the deep brachial artery (profunda artery)

Question 20

20) All three muscles of the anterior compartment are innverated by what nerve?

Answer 20

�Musculocutaneous

Question 21

21) What is the action at the triceps?

Answer 21

�Strong extensor of the elbow

Question 22

22) Another action of long head of the triceps brachii?

Answer 22

� a. Weak extensor shoulder joint

b. Weak adduction of the shoulder joint

Question 23

23) What muscle does the musculocutaneous pierce?

Answer 23

�It pierces the coracobrachialis

Question 24

24) Where does it run after it pierces the brachialis?

Answer 24

�It runs between the biceps brachii and brachialis muscle

Question 25

25) Where can it be found at the elbow?

Answer 25

�lateral to elbow

Question 26

26) What happens after the musculocutaneous runs at the elbow?

Answer 26

�It pierces deep fascia and runs superficially as the lateral cutaneous nerve of the forearm

Question 27

27) How does the radial nerve run?

Answer 27

�It enters the posterior compartment and runs in the radial groove with the deep brachial artery. Then it pierces the lateral intermuscular septum at the elbow. Then it enters the lateral portion of the cubital fossa and runs between brachialis and brachioradialis muscle.

Question 28

28) What are the boundaries of the cubital fossa?

Answer 28

�a. The proximal border is in between the lateral and medial epicondyles of the humerus

b. The lateral border is the brachioradialis muscle
c. The medial border is the pronator teres muscle

Question 29

29) What is on the roof of the cubital fossa?

Answer 29

�Skin, fascia, bicipital aponeurosis

Question 30

30) What are the contents of the cubital fossa?

Answer 30

� TAN

a. Biceps tendon, b. brachial artery, c. median Nerve

Question 31

31) What is the floor of the cubital fossa?

Answer 31

�a. Laterally: Supinator muscle Medially: Brachialis muscle

Question 32

32) Where does the tendon of the biceps go superiorly?

Answer 32

�It goes under the transversal humeral ligament

Question 33

33) What sometimes happens here?

Answer 33

�The constant rubbing will cause inflammation and this is called bicep tendinitis

Question 34

34) Untreated biceps tendinits leads to what?

Answer 34

�a ruputured biceps tendon

Question 35

35) How can the biceps tendon become dislocated from the bicipital groove?

Answer 35

�Tear of the transverse humeral ligament

Question 36

36) What test can be done to see if dislocation of the biceps tendon is there?

Answer 36

� Yergason test

Question 37

37) What is the yergason test?

Answer 37

�The yergason test consists of: in a semiflexed position, a lateral rotation of the shoulder joint and an extension of the elbow joint while a clinician provides resistance. The tendon will pop out of place if there is instability of the long head of the biceps tendon

Question 38

38) Where are the most common places for venipuncture?

Answer 38

� a. Median cubital vein, b. Cephalic vein, c. Basilic vein

Question 39

39) When can you not receive venipuncture?

Answer 39

�a. Arm on the side of a masectomy, b. Arm in which you are receiving a blood transfusion, c. Arm in which is burned, scarred or grafted.