|The extensors of the elbow include the lateral head of
the triceps, which originates on the deltoid ridge of the humerus; and the anconeus,
which originates on the lateral surface of the humerus.
One of the flexors of the forearm is the brachialis which originates on the shaft of the humerus. Another flexor of this region is the biceps brachii which originates from a tendon attached to the glenoid fossa of the scapula and inserts on the radial tuberosity. It is seen from a medial view.
These two groups of muscles act in opposition to straighten and bend the forearm.
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