The coronoid process of the ulna is a triangular
process
A process is a series or set of activities that interact to produce a result; it may occur once-only or be recurrent or periodic.
Things called a process include:
Business and management
*Business process, activities that produce a specific se ...
projecting forward from the anterior proximal portion of the
ulna
The ulna (''pl''. ulnae or ulnas) is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. That is, the ulna is on the same side of t ...
.
Structure
Its ''base'' is continuous with the body of the bone, and of considerable strength. Anatomy
Its ''apex'' is pointed, slightly curved upward, and in flexion of the
forearm
The forearm is the region of the upper limb between the elbow and the wrist. The term forearm is used in anatomy to distinguish it from the arm, a word which is most often used to describe the entire appendage of the upper limb, but which in ...
is received into the
coronoid fossa of the humerus.
Its ''upper surface'' is smooth, convex, and forms the lower part of the
semilunar notch.
Its ''antero-inferior'' surface is concave, and marked by a rough impression for the insertion of the
brachialis muscle. At the junction of this surface with the front of the body is a rough eminence, the
tuberosity of the ulna
The tuberosity of the ulna is a rough eminence on the proximal end of the ulna. It occurs at the junction of the antero-inferior surface of the coronoid process with the front of the body. It provides an insertion point to a tendon of the brachial ...
, which gives insertion to a part of the brachialis; to the lateral border of this tuberosity the
oblique cord is attached.
Its ''lateral surface'' presents a narrow, oblong, articular depression, the
radial notch.
Its ''medial surface'', by its prominent, free margin, serves for the attachment of part of the
ulnar collateral ligament. At the front part of this surface is a small rounded eminence for the origin of one head of the
flexor digitorum superficialis muscle; behind the eminence is a depression for part of the origin of the
flexor digitorum profundus muscle; descending from the eminence is a ridge which gives origin to one head of the
pronator teres muscle.
Frequently, the
flexor pollicis longus muscle arises from the lower part of the coronoid process by a rounded bundle of muscular fibers.
Function
The coronoid process stabilises the
elbow
The elbow is the region between the arm and the forearm that surrounds the elbow joint. The elbow includes prominent landmarks such as the olecranon, the cubital fossa (also called the chelidon, or the elbow pit), and the lateral and the m ...
joint and prevents
hyperflexion
Motion, the process of movement, is described using specific anatomical terms. Motion includes movement of organs, joints, limbs, and specific sections of the body. The terminology used describes this motion according to its direction relat ...
.
Clinical significance
The coronoid process can be
fractured from its
anteromedial facet.
Additional images
File:Gray213.png, Bones of left forearm. Anterior aspect.
File:Elbow joint - deep dissection (anterior view, human cadaver).jpg, Elbow joint. Deep dissection. Anterior view.
File:Slide2xzxzxz.JPG, Elbow joint. Deep dissection. Anterior view.
References
External links
* ,
*
X-ray at uams.edu
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Ulna