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Radius

From WikiSM
(Redirected from Listers Tubercle)

Description

Labeled radius[1]
Lateral elbow radiograph labeled[2]
Normal DRUJ on a PA film[3]
Labeled PA radiograph of the forearm[4]
Schematic drawing of both the radius and the ulna (left and right) and the forearm bones together with the interosseus membrane. The black shaded areas represent the capsular insertions, the blue and red shaded areas show the abundant muscular origins and targeting areas[5]
Anatomy of the distal radius[6]

Name

  • Radius
  • Radial bone
  • Radii (plural)
  • Radial bone
  • Lateral forearm bone
  • Bone of the radial side of the forearm
  • Antebrachial radiu

General

  • Lateral bone of the forearm which extends from the lateral elbow to the thumb[7]
  • Lies lateral, parallel to the ulna
  • Pivots around the ulna to produce movement at the proximal and distal radioulnar joint
  • Contributes to both the elbow and wrist joints

Articulations

Muscular Attachments

Vascular supply

Innervation

Ossification Centers

  • Body: appears in 8th week of fetal life
  • Proximal extremity: appears around 5 years of age, fuses with the body around 17-18 years of age
  • Distal extremity: appears around 9-26 months of life and fuses with the body around 20 years of age

Proximal

Gross Anatomy

  • The head of the radius articulates proximally with the capitulum of the humerus, contributing to the elbow joint
  • The radial notch of the ulna articulates the radial head to form the proximal radioulnar joint
  • Neck of the of the radius is marked by the narrowing of the radius distal to the head
  • The radial tuberosity is located distally to the neck of the radius and proximally to the shaft.
    • It is a protrusion of the radius that serves as the distal attachment of the biceps brachii muscle.

Ligaments

Mid Shaft

Gross Anatomy

  • The shaft of the radius enlarges as it travels distally
  • Similar to the ulna, it is triangular with 3 borders and 3 surfaces
  • In the middle of the lateral surface, there is a small roughening for the attachment of the pronator teres

Interosseous Membrane of Forearm

  • A fibrous sheath of connective tissue that extends in an oblique course medially from the radius to the ulna.
  • Function: holds the two bones together as well as separates the extensor and flexor compartments of the forearm.
  • Clinically, it allows the transmission of forces from the radius to the ulna and vice versa.

Distal

Gross Anatomy

  • The distal radius is large and quadrilateral in shape
  • Medially, there is a concavity located at the distal end of the radius.
  • Distal Radioulnar Joint is formed by the ulnar notch and head of the ulna
  • The dorsal tubercle (Lister's tubercle): posterior projection at the distal end of the radius.
  • Styloid process: extends laterally at the distal end of the radius
    • It is larger than the styloid process of the ulna and extends more distally
  • Wrist Joint Distally, the radius articulates with the scaphoid, lunate

Muscle Attachments

Ligaments of the Distal Radius

Clinical Significance

Distal Radius Fracture

Other

Pediatric Considerations

See Also

References

  1. ↑ Image courtesy of theskeletalsystem.net
  2. ↑ Image courtesy of grepmed.com
  3. ↑ Image courtesy of musculoskeletalkey.com
  4. ↑ Image courtesy of radiologypics.com
  5. ↑ Mader, Konrad, et al. "Complex forearm deformities: operative strategy in posttraumatic pathology." Obere Extremitat 10.4 (2015): 229.
  6. ↑ Madanat, Rami. "The Use of Radiostereometric Analysis in Fractures of the Distal Radius: From Phantom Models to Clinical Application." (2011).
  7. ↑ Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 8th ed. Lippincott Williams and Wilkins; 2017.
Created by:
Maugusta on 22 December 2020 16:40:29
Authors:
Last edited:
13 December 2025 16:37:40
Category:
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