Coronoid process of the ulna
Encyclopedia
The coronoid process is a triangular eminence projecting forward from the upper and front part of the ulna
.
Its base is continuous with the body of the bone, and of considerable strength.
Its apex is pointed, slightly curved upward, and in flexion of the forearm
is received into the coronoid fossa of the humerus
.
Its upper surface is smooth, concave, 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, 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.
The coronoid process of the ulna should not be confused with the similar sounding coracoid process of the scapula.
Ulna
The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form and runs parallel to the radius, which is shorter and smaller. In anatomical position The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form...
.
Its base is continuous with the body of the bone, and of considerable strength.
Its apex is pointed, slightly curved upward, and in flexion of the forearm
Forearm
-See also:*Forearm flexors*Forearm muscles...
is received into the coronoid fossa of the humerus
Coronoid fossa of the humerus
Superior to the anterior portion of the trochlea is a small depression, the coronoid fossa, which receives the coronoid process of the ulna during flexion of the forearm. It is directly adjacent to the Radial fossia of the Humerus....
.
Its upper surface is smooth, concave, and forms the lower part of the semilunar notch
Semilunar notch
The semilunar notch of the ulna is a large depression, formed by the olecranon and the coronoid process, and serving for articulation with the trochlea of the humerus....
.
Its antero-inferior surface is concave, and marked by a rough impression for the insertion of the Brachialis muscle
Brachialis muscle
The brachialis is a muscle in the upper arm that flexes the elbow joint. It lies deeper than the biceps brachii, and is a synergist that assists the biceps brachii in flexing at the elbow...
. At the junction of this surface with the front of the body is a rough eminence, the tuberosity of the ulna, 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
Radial notch
The radial notch of the ulna is a narrow, oblong, articular depression on the lateral side of the coronoid process; it receives the circumferential articular surface of the head of the radius....
.
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
Flexor digitorum superficialis muscle
Flexor digitorum superficialis is an extrinsic flexor muscle of the fingers at the proximal interphalangeal joints....
; behind the eminence is a depression for part of the origin of the Flexor digitorum profundus muscle
Flexor digitorum profundus muscle
- References :...
; descending from the eminence is a ridge which gives origin to one head of the Pronator teres muscle
Pronator teres muscle
The pronator teres is a muscle of the human body that, along with the pronator quadratus muscle, serves to pronate the forearm .-Structure:...
.
Frequently, the Flexor pollicis longus muscle
Flexor pollicis longus muscle
The flexor pollicis longus is a muscle in the forearm and hand that flexes the thumb...
arises from the lower part of the coronoid process by a rounded bundle of muscular fibers.
The coronoid process of the ulna should not be confused with the similar sounding coracoid process of the scapula.