Week 10- Arm and Cubital Fossa

Question 1

What is found in the anterior compartment of the arm?

What is the function of the anterior compartment of the arm?

Answer 1

BBC- brachialis, biceps brachii and coracobrachiallis
Musculocutaneous nerve
Flex the elbow and arm.

Question 2

Describe the attachments of the biceps brachii muscle?

Answer 2

Biceps brachii has two heads.
The long head attaches from the supraglenoid tubercle on the scapula to the radial tuberosity.
The short head attaches from the corocoid process and attaches to the radial tuberosity.

Question 3

Describe the attachments of the biceps brachii muscle?

Answer 3

Biceps brachii has two heads.
The long head attaches from the supraglenoid tubercle on the scapula to the radial tuberosity.
The short head attaches from the corocoid process of the scapula and attaches to the radial tuberosity.

Question 4

What does the biceps brachii do?

Answer 4

Its main job is to supinate the forearm. It also is a weak flexor of the arm at the elbow and shoulder.

Question 5

What nerve supplies the anterior arm?

Answer 5

Musculocutaneous nerve

Question 6

What are the attachments of coracobrachiallis?

Answer 6

Attach from the corocoid process of the scapula to the medial mid-humeral shaft.

Question 7

What is the function of coracobrachiallis?

Answer 7

Responsible for flexion of the arm and adduction.

Question 8

Which nerve supplies biceps brachii?

Answer 8

C5-C6 musculocutaneous nerve

Question 9

Which nerve supplies coracobrachiallis?

Answer 9

C5-C7 musculocutaneous nerve.

Question 10

What are the attachments of the brachiallis muscle?

Answer 10

Distal half of the anterior surface of the humerus and inserts onto the ulnar tuberosity and coronoid process (of the ulnar).

Question 11

What is the function of the brachiallis muscle?

Answer 11

Flexion at the elbow.

Question 12

Which nerve supplies the brachiallis muscle?

Answer 12

Musclocutaneous nerve (C5, 6)
A small component of the lateral fibres may be supplied by the radial nerve.

Question 13

Which muscle is in the posterior compartment of the arm?

Answer 13

Triceps brachii

Question 14

What are the attachment points of the triceps muscle?

Answer 14

It has three heads.
Long head attaches to the infraglenoid tubercle on the scapula.
Medial head from the posterior surface of the shaft of the humerus.
Lateral head from the humerus, superior to the radial groove.
Insert onto the olecranon of the ulna.

Question 15

What is the function of the triceps brachii?

Answer 15

Extension at the elbow.

The long head also resists dislocation at the shoulder joint.

Question 16

What nerve supplies the triceps muscle?

Answer 16

Radial nerve (C6-8)

Question 17

Where does the brachial artery begin?

Answer 17

After crossing the teres major muscle.

Question 18

What is the first branch the brachial artery gives off?

Answer 18

Profunda brachii artery. This passes through the triangular space with the radial nerve and runs down the posterior surface of the arm.

Question 19

What are the other branches of the brachial artery?

Answer 19

There is one radial collateral vessel and two ulnar collateral vessels. The radial collateral vessel is a branch from profunda brachii and the ulnar collateral vessels are direct branches from the brachial artery.

Question 20

Where is the cubital fossa?

Answer 20

It is a depression anterior to the elbow joint.

Question 21

What are the boundaries of the cubital fossa?

Answer 21

Laterally- brachioradiallis muscle
Medially- pronator teres
Floor- Brachiallis muscle
Roof- skin, fascia and bicipital aponeurosis

Question 22

What are the two main veins draining the upper limb?

Answer 22

The cephalic and basilic veins.

Question 23

What is the vein that connects the basilic and cephalic veins?

Answer 23

median cubital vein.

Question 24

What are the contents of the cubital fossa?

Answer 24

From medial to lateral:
Median nerve
Bifurcation of the brachial artery into radial and ulnar. 
Tendon of biceps
Radial nerve
Deep veins accompanying the artery.

Question 25

Which nerve is associated with the medial inter muscular septum?

Answer 25

Ulnar nerve.

Question 26

Which nerve peirces the coracobrachiallis muscle?

Answer 26

Musculocutaneous.

Question 27

Which nerve is associated with the lateral inter muscular septum?

Answer 27

Radial nerve

Question 28

What is the common flexor origin on the humerus?

Answer 28

Medial epicondyle.

Question 29

What is the common extensor origin on the humerus?

Answer 29

Lateral epicondyle.

Question 30

What forms the elbow joint?

Answer 30

Humerus, radius and ulnar.
Also medial and lateral collateral ligaments.
Annular ligament
Joint capsule.

Question 31

What sort of joint is the elbow joint?

Answer 31

A synovial hinge joint.

Question 32

What do the medial and lateral collateral ligaments do?

Answer 32

They prevent abduction/adduction

Question 33

What does the annular ligament allow?

Answer 33

It wraps around the head of the radius and allows pronation and supination.

Question 34

Which ligament has three parts to it? What are they called?

Answer 34

The medial collateral ligament has three parts- anterior, posterior and oblique.