cubital fossa.powerpoint presentation ppt

cubital fossa

1. Posterior Compartment of Arm Dr. Neha Vijay Associate Professor, Department of Anatomy

2. T. S. of the Arm

3. A few fibres of deep head are inserted into the posterior aspect of the capsule of elbow joint and are referred to as articularis cubiti or subanconeus muscle. These fibres prevent the nipping of the capsule during extension of the arm. Triceps Muscle

4. Radial Nerve

5. Intermuscular Spaces (anterior view)

6. Branches 1. In the axilla : (a) Nerves to long and medial heads of triceps. (b) Posterior cutaneous nerve of the arm. 2. In the spiral groove: (a) Nerves to lateral and medial heads of triceps. (b) Nerve to anconeus . (c) Lower lateral cutaneous nerve of the arm. (d) Posterior cutaneous nerve of forearm. 3. In the anterior compartment of the arm: (a) Nerves to brachialis , brachioradialis , and extensor carpi radialis longus . (b) Articular branches to the elbow joint. (c) Deep radial nerve. (d) Superficial radial nerve

7. Injury of radial nerve in radial groove: If the radial nerve is damaged in the radial groove, the extension of elbow and triceps reflex is not lost because nerve to long head arises from the radial nerve in axilla .

8. Ulnar Nerve The ulnar nerve arises from medial cord of the brachial plexus in the axilla . It then runs downwards on the medial side of the arm medial to the brachial artery up to the insertion of coracobrachialis . Here it pierces the medial intermuscular septum along with the superior ulnar collateral artery to enter the posterior compartment of the arm. At the elbow, the ulnar nerve passes behind the medial epicondyle of humerus where it can be easily palpated. The ulnar nerve does not give any branch in the arm.

9. Profunda Brachii Artery (Deep Artery of the Arm) The profunda brachii artery is the largest branch of the brachial artery. It arises from the posterolateral aspect of the brachial artery just below the teres major.

10. Branches of Profunda Brachii Artery

11. Branches 1. Deltoid (ascending) branch: It ascends between long and lateral heads of triceps and anastomoses with the descending branch of the posterior circumflex humeral artery. 2. Nutrient artery to humerus : It enters the shaft of humerus in the radial groove, just behind the deltoid tuberosity . 3. Anterior descending (radial collateral) artery: It is the smaller terminal branch, which accompanies the radial nerve and anastomoses with the radial recurrent artery in front of the lateral epicondyle of the humerus . 4. Posterior descending (middle collateral) artery: It is the larger terminal branch of the profunda brachii artery, which descends behind the shaft of humerus and anastomoses with the interosseous recurrent artery behind the lateral epicondyle of the humerus .

12. 1. Which event does not occur at the insertion of coracobrachialis ? a. Median nerve crosses brachial artery from the Iateral to the medial side b. Ulnar nerve pierces medial intermuscular septum c. Lateral cutaneous nerve of forearm pierces the deep fascia d. Radial nerve pierces lateral intermuscular septum 2. Interosseous recurrent artery is a branch of: a. Ulnar artery b. Common interosseous artery c. Anterior interosseous artery d. Posterior interosseous artery

13. 3. Nerve felt behind medial epicondyle of humerus is: a. Radial nerve b. Median nerve c. Musculocutaneous nerve d. Ulnar nerve 4.Which of the following nerve i^jrry leads to wrist drop? a. Ulnar b. Radial c. Median d. Axillary

14. 5. Lateral boundary of cubital fossa is formed by: a. Biceps brachii b. Brachioradialis c. Brachialis d. Extensor carpi radialis longus 6. Fracture of humerus at mid-shaft is likely to cause injrry to which of the following nerves? a. Median nerve b. Radial nerve c. Ulnar nerve d. Musculocutaneous nerve

15. 7. Order of structures from medial to lateral side in cubital fossa is: a. Median nerve, brachial artery, biceps tendon and radial nerve b. Median nerve, biceps tendon, radial nerve/ branchial artery c. Median nerve/ brachial attety , radial nerve and biceps tendon d. Brachial artery, median nerve, biceps tendon, radial nerve 8. Name the heads of triceps brachii muscle: a. Long, medial and posterior b. Long,lateral and medial c. Long, lateral and posterior d. Lateral, medial and posterior

16. Case Scenario Question In a motorcycle accident, there was injury to the middle of back of arm . What nerve is likely to be injured? . What muscles are affected? Name five of them. . What is the effect of injury? Ans. Due to injury to the middlie of back of arm, the radial nerve gets injured. The muscle of back of arm are affected partially are lateral and medial heads of triceps brachii . A part of muscle escapes paralysis as it gets supplied in the axilla , The other muscles affected are the extensors of forearm" These are brachioradialis , extensor carpi radialis longus and trrevis , extensor digitorurn and extensor pollicis longus . The effect of injury is "Wrist drop".