Posterior Compartment Of The Arm

Question 1

Which head of the triceps attaches onto the infraglenoid tubercle of the scapula?

Answer 1

The long head

Question 2

What is the main action of the triceps on the elbow joint?

Answer 2

Extension

Question 3

What is the action of the triceps muscle?

Answer 3

Extension of elbow joint
Long head assists in shoulder extension and adduction

Question 4

What is the action of the anconeus muscle?

Answer 4

Assist in elbow extension
Stabilizes the elbow joint

Question 6

What is the nerve supply to the triceps and anconeus?

Answer 6

Radial nerve - C6, 7, 8

Question 7

What is the characteristic sign of a radial nerve injury?

Answer 7

Wrist drop

Question 8

What muscles does the radial nerve innervate?

Answer 8

All extensor muscles of elbow and wrist joint

Question 9

Which vein lies to the roof of the antecubital fossa?

Answer 9

The median cubical vein

Question 10

At what level does the brachial artery bifurcate into the radial and ulnar artery?

Answer 10

Neck of the radius

Question 11

Which ligament holds the ulnar in place?

Answer 11

Ulnar/medial collateral ligament

Question 12

Which ligament holds the head of the radius?

Answer 12

Annular ligament