The interosseous border is continuous with the interosseous membrane that attaches the ulna and radius together. The anterior and posterior borders of the radial notch provide attachment, for the annular ligament of the radius, and the depressed area: below the notch is limited behind by the supinator crest. Reviewer: Just below this muscle attachment, a second, smaller one can be found for the flexor pollicis longus. Interosseous border of the radius (margo interosseus radii) is the medial edge (margin) of the bone where the interosseous membrane attaches. The interosseous border is usually continuous above with the supinator crest. Image: “Diagram showing interosseous membrane expanding between radius and ulna.” by Dr. Johannes Sobotta – Sobotta’s Atlas and Text-book of Human Anatomy 1909. The part of the trochlear notch, which is formed by the olecranon is, typically, divided into three areas. PGRpdiBpZD0idmlkZW8tcG9wdXAtMSIgc3R5bGU9IndpZHRoOiAxMDAlOyBoZWlnaHQ6IDEwMCU7Ij48aWZyYW1lIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIHNyYz0iaHR0cHM6Ly93d3cueW91dHViZS5jb20vZW1iZWQvdzZQMFVrVDlZSzA/cmVsPTAmY29udHJvbHM9MCZzaG93aW5mbz0wIiBmcmFtZWJvcmRlcj0iMCIgYWxsb3dmdWxsc2NyZWVuPjwvaWZyYW1lPjwvZGl2Pg==. Synonym: margo posterior ulnae. The origin for the flexor carpi ulnaris muscles and ulnar head of the supinator muscle are also located on the proximal posterior surface. In the natural conditions of parts, with the arm hanging by the side, the styloid process of the radius is on a lower level than that of the ulna. As it moves distally, it decreases in width. It works to extend and adduct the wrist. The proximal part of the radius articulates with the ulna. • Forearm, Pages 313 to 315. The former may take part in the formation of the semilunar notch although it does not usually do so. Its lower part is smooth and rives origin to the uppermost fibers of the flexor digitoruin profundus. The anterior surface of the coronoid process, including the tuberosity of the ulna, receives the insertion of the brachialis muscle. Laterally we can find the attachment of two muscles: Medially, in between the invagination created by the two laterally attaching muscles, we can see the origins  of another two muscles, as follows: The larger of the two muscular attachments that cover the distal end of the shaft on its medial surface is that of pronator quadratus muscle.

If the balance of nature is left untouched, landscapes can change dramatically over time. Medial – unremarkable. It is not intended to provide medical, legal, or any other professional advice. In the same extent the muscle arises also from the anterior border and the medial surface, extending upwards on to the medial sides of the coronoid process and the olecranon.

posterior border of ulna The sinuous palpable subcutaneous ridge on the posterior aspect of the ulna that extends from near the olecranon to the styloid process, demarcating anterior from posterior compartments of forearm. The distal part of the radius contains articulation sites for the carpal bones, the scaphoid and the lunate. The muscles, along with their functions, innervations, and attachments, belonging to the superficial layer of the posterior compartment include the following: Muscles, along with their functions, innervations, and attachments, belonging to the deep layer of the posterior compartment include the following: The anterior and posterior interosseous arteries, along with the radial artery, are the main arterial supply of the posterior compartment of the forearm. Its subcutaneous border lies posteromedially and the antebrachial fascia attaches on either end. Ossification begins near the middle of the shaft, about the eighth week of fetal life, and soon extends through its greater part. Origin: - Leh Insertion: - Extensor expansion of 5th digit Action: Its posterior aspect, smooth and triangular in outline, can easily be felt through the skin, and its upper border constitutes the point of the elbow. Extensor carpi ulnaris comprises its most medial part. It also works to extend and abduct the wrist. The ulna is a long bone in the forearm. Innervation: deep branches of the radial nerve (C7, C8), also originates from the lateral epicondyle of the humerus and inserts as four separate tendons on the dorsal parts of the bases of the middle and distal phalanges of the index, middle, ring, and little fingers. The radius also communicates with the head of the ulna by articulating with the ulna’s radial notch via its own circumference. WebMD LLC. The interosseous border is continuous with the interosseous membrane that attaches the ulna and radius together. The radius is the lateral of the two bones, which makes the ulna the medial bone of the forearm. Elbow and Forearm, Guide: Upper Limb - Elbow and Forearm, Pages 224 to 225.
License: CC BY-SA 2.1 JP. The radial notch (fig. Synonym: margo posterior ulnae. originates from the medial epicondyle of the humerus and inserts in the palmar aponeurosis of the hands. 10: The forearm. Works to flex and adduct the wrist. , are the main arterial supply of the posterior compartment of the forearm. Discover why exactly anatomy quiz questions are the secret to your success. Image: “Diagram showing cross-section of anterior compartment of the forearm.” by Henry Vandyke Carter, Henry Gray (1918) Anatomy of the Human Body. It works to extend the thumb. Innervation: posterior interosseous nerve (C7, C8), also originates from the lateral epicondyle of the humerus and inserts in the hood of the little finger. Generality The ulna is the even bone which, together with the radius (with respect to which it is in the medial position), composes the skeleton of each forearm. Pronation of the forearm and the hand is when they are turned inwards; that is, the palm is facing the ground. The ulna 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. Meanwhile The posterior surface of the radius is the origin of  two more muscles: Looking for a way to learn faster and have fun at the same time? Un caso raro del musculo flexor ulnar del carpo digastrico, posterior basal bronchopulmonary segment S X, posterior basal segmental artery of left/right lung, posterior border of petrous part of temporal bone, posterior branch of great auricular nerve, posterior branch of inferior pancreaticoduodenal artery, posterior branch of medial cutaneous nerve of forearm, posterior branch of right branch of portal vein, posterior branch of ulnar recurrent artery, posterior calcaneal articular facet of talus, posterior cervical intertransversarii (muscles), posterior basal segmental artery of leftright lung, posterior branch of lateral cerebral sulcus, posterior branch of medial antebrachial cutaneous nerve, posterior branch of recurrent ulnar artery, posterior branch of right superior pulmonary vein, posterior branch of superior thyroid artery. Origin: - Leh Insertion: - Extensor expansion of 5th digit Action: 1. This is covered by the flexor digitorum profundus muscle which spans the majority of the ulnar shaft.

Fractures from indirect force generally take place somewhere about the middle of the bones, while those from direct violence may occur at any part, but are most frequent in the lower half of the bones. Slightly inferior to it on the opposite side sits the insertion of the brachioradialis muscle, which is just above the styloid process - an extrusion of the suprastyloid crest. Towards the end of the anterior surface, a tubercle with the tendon of the brachioradialis muscle is found. Innervation: radial nerve (C6, C7), It originates from the lateral epicondyle of the humerus, inserts in the dorsal surface of the 2nd and 3rd metacarpals. This tubercle gives attachment to the oblique and anterior bands of the medial ligament of the elbow-joint and to the lowest part of the hntnero-uhiar head of the flexor digitorum sublimis muscle. The structures dividing the forearm into these compartments are as follows: Image: “Diagram showing the cross-section of the upper arm (left) and forearm (right).” by Braus, Hermann – Anatomie des Menschen: ein Lehrbuch für Studierende und Ärzte. Dimitrios Mytilinaios MD, PhD This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Kenhub. Its interosseous border (anterolaterally) is attached to the interosseous membrane of the forearm. The bone is not perfectly straight, and shows a slight but appreciable double curve. They are the division of the brachial artery from the upper arm: the radial and ulnar arteries. – anastomoses in the hand to supply the carpal bones, anastomoses with the superficial arch of the ulnar artery.
Required fields are marked *. 422, 423).–The ulna is ossified from three centers : one each for the shaft, the lower end, and the top of the olecranon. by locating the tendon of the flexor carpi radialis muscle in the distal forearm. The upper epiphysis joins the shaft about the sixteenth, the lower about the twentieth year. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours.