this presentation give detailed information about posterior compartment of arm.After read this presentation you have describe about muscles of posterior compartment of arm and blood supply and nervous innervation , action of posterior compartment.Also clinical importance of posterior compartment

1. DR.M.VASANTHAKOHILA MBBS MD
FIRST YEAR POSTGRADUATE

2. INTRODUCTION
MUSCLE
NERVE SUPPLY
BLOOD VESSELS
FUNCTION

3. Compartment of the Arm
• Muscle: The triceps muscle
• Nerve supply to the muscle: Radial
nerve.
• Blood supply: Profunda brachii and ulnar
collateral arteries
• Structures passing through the
compartment
Radial nerve and ulnar nerve

4. Triceps muscle
• Origin:
• Long head: from the infraglenoid tubercle of the scapula.
• Lateral head: from the upper half of the posterior surface of
the shaft of the humerus.
• Medial head: from the lower half of the posterior surface of the
shaft of the humerus
• Insertion:
• Into the upper surface of the olecranon process of the ulna.
• Nerve Supply:
• From the radial nerve.
• Action:
• Extension of the forearm at the elbow joint.

6. Radial Nerve
 The origin of the radial nerve from the posterior cord of
the brachial plexus in the axilla.
 The nerve winds around the back of the arm in the spiral
groove.
 In the spiral groove, the nerve is accompanied by the
profunda vessels, and it lies directly in contact with the
shaft of the humerus.
 It pierces the lateral fascial septum above the elbow and
continues downward into the cubital fossa in front of the
elbow, between the brachialis and the brachioradialis
muscles.

7. RADIAL NERVE

8. In the axilla,
• Muscular branches to the long and medial heads of the
triceps
• Posterior cutaneous nerve of the arm.
In the spiral groove
• Muscular branches to the lateral and medial heads of
the triceps and to the anconeus muscle.
• The lower lateral cutaneous nerve of the arm
• The posterior cutaneous nerve of the forearm.
In the anterior compartment of the arm
• Muscular branches to the brachialis, the
brachioradialis, and the extensor carpi radialis longus
muscles.
• Articular branches to the elbow joint.

10. Ulnar Nerve
• It is a branch of the medial cord of the brachial plexus
• It pierces the medial fascial septum and descends behind
the septum, covered posteriorly by the medial head of the
triceps.
• The nerve is accompanied by the superior ulnar collateral
vessels.
• At the elbow, it lies behind the medial epicondyle of
the humerus.
• It continues downward to enter the forearm between the
two heads of origin of the flexor carpi ulnaris
Branches
• The ulnar nerve has an articular branch to the elbow joint

12. Profunda Brachii Artery
• The profunda brachii artery arises from the brachial artery
near its origin.
• It accompanies the radial nerve through the spiral groove,
supplies the triceps muscle, and takes part in the
anastomosis around the elbow joint.
• Superior and Inferior Ulnar Collateral Arteries
• The superior and inferior ulnar collateral arteries arise
from the brachial artery and take part in the anastomosis
around the elbow joint.