bony features of ulna and radius Flashcards
head of radius
has a cylindrical form, and on its upper surface is a shallow cup or fovea for articulation with the capitulum of the humerus.
the circumference of the head is smooth; it is broad medially where it articulates with the radial notch of the ulna
tuberosity of radius
located beneath the neck of the radius, on the medial side.
its surface is divided into: an anterior, rough portion, for the insertion of the tendon of the biceps brachii.
a posterior, smooth portion, on which a bursa is interposed between the tendon and the bone.
anterior oblique line of radius
anterior border extends from the anterior margin of the radial tuberosity to the styloid process. It is oblique in the upper half of the shaft, and vertical in the lower half.
styloid process of radius
projection of bone on the lateral surface of the distal radius bone. It extends obliquely downward into a strong, conical projection.
The tendon of the brachioradialis attaches at its base, and the radial collateral ligament of the wrist attaches at its apex.
dorsal tubercle of radius
a bony prominence located at the distal end of the radius , palpable on the dorsum of the wrist
posterior oblique line of radius
posterior border is the mirror image of the anterior border, but is clearly defined only in its middle one-third. The upper oblique part is known as the posterior oblique line.
head of ulna
articulating with the ulnar notch of radius
coronoid process of ulna
a triangular eminence projecting forward from the anterior proximal portion of the ulna. Its base is continuous with the body of the bone, and of considerable strength.
tuberosity of ulna
located at the junction of the antero-inferior surface of the coronoid process with the front of the body
gives insertion to a part of the Brachialis; to the lateral border of this tuberosity the oblique cord is attached.
styloid process of ulna
found at distal end of the forearm, and projects from the medial and back part of the bone
its rounded end affords attachment to the ulnar collateral ligament of the wrist.
The head is separated from the styloid process by a depression for the attachment of the apex of the triangular articular disk , and behind, by a shallow groove for the tendon of the extensor carpi ulnaris muscle .
posterior border of ulna
sinuous palpable subcutaneous ridge on the posterior aspect of the ulna that extends from near the olecranon to the styloid process, demarcating the “anterior” (flexor) from “posterior” (extensor) compartments of forearm.
olecranon of ulna
the large, thick, curved bony eminence of the ulna, a long bone in the forearm that projects behind the elbow. It forms the most pointed portion of the elbow and is opposite to the cubital fossa or elbow pit.
