Anatomy of human ulna bone:

Posted on 8:44 PM by Ahsan Iqbal

The human ulna bone is one of the two bones of the forearm (the other being the radius bone). Classification wise it is a typical long bone with two epiphyses and one diaphysis. The ulna has an upper end, a shaft and a lower end.
Upper end of the human ulna bone: The upper end of the human ulna bone includes two processes of the bone namely olecranon process and the coronoid process. The olecranon process is towards the superior aspect and the coronoid process is towards the anterior aspect. The olecranon process of the ulna has five surfaces that are anterior, posterior, medial, lateral and superior. The anterior surface is articulatory. The posterior surface forms a triangle and the superior aspect of this triangle is the subcutaneous part of the elbow. The medial surface continues with the medial surface of the shaft of the bone, the lateral surface continues with the posterior surface of the shaft of the bone and the superior surface is quadrangular in shape providing the space for attachment of the triceps muscle.
The coronoid process has four surfaces that are superior, anterior, medial and lateral. The superior surface is articulatory forming the lower part of the trochlear notch of ulna. The anterior surface is rough and triangular in shape. It also contains the tuberosity of ulna. The medial surface continues with the medial surface of the shaft of the bone. The lateral surface provides a ridge known as the supinator crest.
Shaft of the human ulna bone: Shaft of the human ulna bone includes three borders namely interosseus border, the anterior border and the posterior border and three surfaces namely the anterior surface, the posterior surface and the medial surface.
Borders: The interosseus border is the lateral border of the bone directing towards similar border of the radius bone. This border is sharpest in its middle two third and it provides attachment for the interosseus membrane of the ulna and radius. The anterior border is a bit rounded one and it starts from the medial aspect of the tuberosity of the ulna. Inferiorly it goes down to the styloid process of the ulna. The posterior border starts from the apex of the triangular space present in the posterior aspect of the olecranon process. The border is clearly visible up to the middle of the bone and then it fades away.
Surfaces: The anterior surface is present between the anterior and interosseus border. The medial surface is present between the anterior and posterior border and the posterior surface is present between the posterior and interosseus border. One thing to be remembered about the posterior surface is that it is divided into three compartments by two lines. An oblique line divides it into two compartments and then the lower compartment is divided by a vertical line into two.
Lower end of the human ulna bone: The lower end of the human ulna bone includes the articulating surface for the inferior radio-ulnar joint. It also includes a styloid process. Between the head and the styloid process, there is a groove for the tendon of the extensor Carpi Ulnaris.
Source:
 Textbook of human anatomy regional and applied (third edition) by Dr. B. D. Chaurasia.

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