MYOLOGY. 69 



Action. Extends forearm. 

 Nerve. Radial . 



LARGE EXTENSOR OF FOREARM. 



Origin. Dorsal angle and axillary border of scapula. 

 Insertion. Into olecranon, after gliding over a bursa. 

 Action. As preceding. 

 Nerve. Radial. 



SHORT EXTENSOR OF FOREARM. 



Origin. Line running from head of humerus to deltoid. 

 Insertion. Imprint with preceding. 

 Action. With preceding. 

 Nerve. Radial. 



MIDDLE EXTENSOR OF FOREARM. 



Origin. Inner surface of humerus above tuberosity. 

 Insertion. Tip and side of olecranon. 

 Action. As preceding. 

 Nerve. Radial. 



ANCONEUS. 



Origin. Above margin of olecranian fossa. 

 Insertion. Anterior and external border of olecranon. 

 Action. Raises capsule of humero-ulnar-radial articulation. 

 . Nerve. Radial. 



FOREARM. 



The anti-brachial aponeurosis is a strong layer of fibrous tissue 

 that binds the muscles of the forearm together and passes between 

 them, forming the inter-muscular septum. It is attached to 

 the olecranon and sides of radius. 



ANTERIOR EXTENSOR OF THE METACARPUS. 



Origin. From humerus below crest of furrow of torsion, and 

 above and in front of the inferior articular portion. 



Insertion. Anterior and superior tuberosity of large meta- 

 carpal bone. 



Action. As name implies. 



Nerve. Radial. 



