Ulna
Updates to Article Attributes
Body
was changed:
The ulna is one of the two long bones of the forearm; it. It is located medially in the supinated anatomic position. It has a larger proximal end and tapers to a smaller distal end (opposite to the radius).
Gross anatomy
Prominent features of the ulna include:
- proximal: olecranon, trochlear notch, coronoid process, radial notch (lateral), sublime tubercle (medial)
- shaft: ulnar tuberosity
- distal: head, styloid process, groove for extensor carpi ulnaris
Articulations
- proximal: elbow joint (ulnatrochlear and proximal radioulnar joints)
- distal: distal radioulnar joint and wrist via the TFCC
Attachments
Musculotendinous
Anteriorly
- proximal: brachialis (to ulnar tuberosity), pronator teres (ulnar head), flexor digitorum superficialis (ulnar head)
- shaft: supinator, flexor digitorum profundus, pronator quadratus
Posteriorly
- triceps, aconeus, supinator, flexor digitorum profundus, flexor carpi ulnaris (ulnar head), extensor carpi ulnaris (ulnar head), abductor pollicis longus, extensor pollicis longus, extensor indices
,
Ligamentous
- proximal: medial collateral ligaments of the elbow (anterior, posterior, and middle bands), anterior and posterior capsular ligaments of the elbow
- medial: anterior and posterior attachments of the annular ligament, quadrate ligament, oblique cord,
interosseusinterosseous membrane - distal: triangular fibrocartilage, ulnar collateral ligament of of the wrist
Relations and/or boundaries
The ulna and its attachments help to divide the forearm into anterior and posterior compartments.
Its subcutaneous border lies postero-medially and the antebrachial fascia attaches on either end.
Its interosseusinterosseous border (anterolaterally) is attached to the interosseusinterosseous membrane of the forearm.
Blood supply
The forearm (and ulna) is supplied by the ulnar artery and its continuation as the common interosseusinterosseous artery with the anterior and posterior interosseusinterosseous branches.
Nerve supply
Periosteum is supplied anteriorly by the anterior interosseusinterosseous nerve (branch of median nerve).
Posteriorly, the periosteum is supplied by the posterior interosseusinterosseous nerve (branch of radial nerve)
Lymphatic supply
Lymphatics of the hand and forearm drain either to the supratrochlear lymph node, or directly into the lateral group of axillary lymph nodes.
Radiographic features
Carrying angle of the elbow of 15-20 degrees. Increased in females.
Development
IntracartilagenousIntracartilaginous ossification begins in utero. Ossification centres include:
- shaft/diaphysis (8 weeks gestation)
- distal (5-7 years >
1616-18 years) - proximal (8-10 years > 13-15 years)
Ossification
Related pathology
- Monteggia fracture: fracture of ulna with dislocation of proximal radioulnar joint
- Galeazzi fracture: fracture of radius with dislocation of distal radioulnar joint
- Essex-Lopresti fracture: fracture of radial head with disruption of the interosseous membrane and dislocation of distal radioulnar joint
- Madelung deformity
- ulnotriquetrial abutment
-<p>The <strong>ulna </strong>is one of the two long bones of the <a href="/articles/forearm">forearm</a>; it is located <em>medially </em>in the supinated anatomic position. It has a larger proximal end and tapers to a smaller distal end (opposite to the <a href="/articles/radius">radius</a>). </p><h4>Gross anatomy</h4><p>Prominent features of the ulna include:</p><ul>- +<p>The <strong>ulna </strong>is one of the two long bones of the <a href="/articles/forearm">forearm</a>. It is located medially in the supinated anatomic position. It has a larger proximal end and tapers to a smaller distal end (opposite to the <a href="/articles/radius">radius</a>). </p><h4>Gross anatomy</h4><p>Prominent features of the ulna include:</p><ul>
-</ul><p>Posteriorly</p><ul><li>triceps, aconeus, supinator, flexor digitorum profundus, flexor carpi ulnaris (ulnar head), extensor carpi ulnaris (ulnar head), abductor pollicis longus, extensor pollicis longus, extensor indices, </li></ul><h6>Ligamentous</h6><ul>- +</ul><p>Posteriorly</p><ul><li>triceps, aconeus, supinator, flexor digitorum profundus, flexor carpi ulnaris (ulnar head), extensor carpi ulnaris (ulnar head), abductor pollicis longus, extensor pollicis longus, extensor indices</li></ul><h6>Ligamentous</h6><ul>
-<li>medial: anterior and posterior attachments of the annular ligament, quadrate ligament, oblique cord, interosseus membrane</li>- +<li>medial: anterior and posterior attachments of the annular ligament, quadrate ligament, oblique cord, interosseous membrane</li>
-</ul><h5>Relations and/or boundaries</h5><p>The ulna and its attachments help to divide the forearm into anterior and posterior compartments. </p><p>Its subcutaneous border lies postero-medially and the antebrachial fascia attaches on either end. </p><p>Its interosseus border (anterolaterally) is attached to the interosseus membrane of the forearm.</p><h5>Blood supply</h5><p>The forearm (and ulna) is supplied by the ulnar artery and its continuation as the common interosseus artery with the anterior and posterior interosseus branches.</p><h5>Nerve supply</h5><p>Periosteum is supplied anteriorly by the anterior interosseus nerve (branch of median nerve).</p><p>Posteriorly, the periosteum is supplied by the posterior interosseus nerve (branch of radial nerve)</p><h5>Lymphatic supply</h5><p>Lymphatics of the hand and forearm drain either to the supratrochlear lymph node, or directly into the lateral group of axillary lymph nodes.</p><h4>Radiographic features</h4><p>Carrying angle of the elbow of 15-20 degrees. Increased in females.</p><h4>Development</h4><p>Intracartilagenous ossification begins in utero. Ossification centres include:</p><ul>- +</ul><h5>Relations and/or boundaries</h5><p>The ulna and its attachments help to divide the forearm into anterior and posterior compartments. </p><p>Its subcutaneous border lies postero-medially and the antebrachial fascia attaches on either end. </p><p>Its interosseous border (anterolaterally) is attached to the interosseous membrane of the forearm.</p><h5>Blood supply</h5><p>The forearm (and ulna) is supplied by the ulnar artery and its continuation as the common interosseous artery with the anterior and posterior interosseous branches.</p><h5>Nerve supply</h5><p>Periosteum is supplied anteriorly by the anterior interosseous nerve (branch of median nerve).</p><p>Posteriorly, the periosteum is supplied by the posterior interosseous nerve (branch of radial nerve)</p><h5>Lymphatic supply</h5><p>Lymphatics of the hand and forearm drain either to the supratrochlear lymph node, or directly into the lateral group of axillary lymph nodes.</p><h4>Radiographic features</h4><p>Carrying angle of the elbow of 15-20 degrees. Increased in females.</p><h4>Development</h4><p>Intracartilaginous ossification begins in utero. Ossification centres include:</p><ul>
-<li>distal (5-7 years > 16-18 years)</li>- +<li>distal (5-7 years > 16-18 years)</li>
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