THE RADIUS::
It is the lateral bone of the forearm it is long bone with a shaft and expanded extremities smaller upper end of the radius consists of head neck and tuberosity head articulates with the capitulum and neck articulates with the radial notch of the ulna and tuberosity is for the insertion of the tendon of the biceps muscle the shaft of radius has a sharp medial border facing the ulna the lower extremity of the radius has an articular surface and at the lateral end of this surface is a downward projection of bone known as styloid process
THE ULNA::
It is the medial bone of the forearm and is slightly longer than the radius it consists of shaft upper and lower extremities upper end of ulna is expanded strong and hook like structure with a large c shaped cavity known as trochlear notch adjascent to this notch is a large mass of bone called olecranon process
THE floor of the trochlear notch projects forwards in a process known as the coronoid process the shaft of the ulna becomes thin as it passes downwards but at the lower end it expands and form the head at the extreme lower end of the ulna on its medial side there is a small downward process called as styloid process
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