CHAPTER -6

BACK OF ARM

Contents:

Triceps brachii muscle

Radial nerve ad profunda brachii vessels in radial groove

A part of ulnar nerve

Triceps Brachii:

Origin :

Long head – from the infraglenoid tubercle of scapula.

Lateral head – Lateral lip of spiral groove and behind the deltoid tuberosity.

Medial head – posterior surface of the humerus below the spiral groove.


Insertion :

          Posterior part of the upper surface of the olecranon process.

Nerve supply : Radial Nerve

Actions:

Extensor of elbow joint

Long head supports the head of humerus in abduction of shoulder joint.

FOR DISSECTION OF BACK OF ARM, WATCH THIS VIDEO:

https://youtu.be/3mJA-LkRerw

RADIAL GROOVE:  (spiral groove)

Present in the middle one third of the posterior surface of humerus.

Contents : Radial nerve and profunda brachii vessels

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