Radius

Radius: Anatomy & FunctionKey facts about the anatomy of the radius
~ 3 min

The forearm (antebrachium) is composed of two bones: the ulna (ulna) and the radius (radius). In the standard anatomical position of a person with the palms turned upward and the thumb facing outward, the ulna is medial, and the radius is lateral.

Radius (radius)
Radius (radius)

Let us examine the structure of the radius. It has several main parts:

  • Body / diaphysis (corpus radii / diaphysis)

Body / diaphysis (corpus radii / diaphysis)
Body / diaphysis (corpus radii / diaphysis)
  • Proximal epiphysis (epiphysis proximalis)

    Proximal epiphysis (epiphysis proximalis)
    Proximal epiphysis (epiphysis proximalis)
  • Distal epiphysis (epiphysis distalis)

    Distal epiphysis (epiphysis distalis)
    Distal epiphysis (epiphysis distalis)

    There are also several surfaces (best seen in the area of the diaphysis):

  • Anterior surface (facies anterior)

  • Posterior surface (facies posterior)

  • Lateral surface (facies lateralis)

    Anterior surface (facies anterior)
    Anterior surface (facies anterior)
    Posterior surface (facies posterior)
    Posterior surface (facies posterior)
    Lateral surface (facies lateralis)
    Lateral surface (facies lateralis)

    There are also three differentiated borders:

  • Anterior border (margo anterior)

    Anterior border (margo anterior)
    Anterior border (margo anterior)
  • Posterior border (margo posterior)

    Posterior border (margo posterior)
    Posterior border (margo posterior)
  • Interosseous border (margo interosseus)

Interosseous border (margo interosseus)
Interosseous border (margo interosseus)

On the proximal epiphysis of the radius lies the head of the radius (caput radii), which has an articular facet (fovea articularis). It connects to the capitulum.

Head of the radius (caput radii)
Head of the radius (caput radii)
Articular facet (fovea articularis)
Articular facet (fovea articularis)

The lateral surfaces of the head are represented by an articular circumference (circumferentia articularis), which connects to the radial notch of the ulna.

Articular circumference (circumferentia articularis)
Articular circumference (circumferentia articularis)

The head passes into the neck of the radius (collum radii).

Neck of the radius (collum radii)
Neck of the radius (collum radii)

The neck has a radial tuberosity (tuberositas radii) to which the biceps is attached.

Radial tuberosity (tuberositas radii)
Radial tuberosity (tuberositas radii)

On the distal epiphysis of the radius lies the ulnar notch (incisura ulnaris), which connects to the head of the ulna.

Ulnar notch (incisura ulnaris)
Ulnar notch (incisura ulnaris)

On the posterior surface of the distal epiphysis is the carpal articular surface (facies articularis carpalis), serving for articulation with the bones of the proximal carpal bones.

Carpal articular surface (facies articularis carpalis)
Carpal articular surface (facies articularis carpalis)

From the distal epiphysis, the styloid process (processus styloideus) is derived on the lateral side.

Styloid process (processus styloideus) antebrachium ulna
Styloid process (processus styloideus) antebrachium ulna
Dictionary

Radius

antebrachium
forearm
ulna
ulna
radius
radius
corpus radii/diaphysis
shaft of radius/diaphysis
epiphysis proximalis
proximal epiphysis
epiphysis distalis
distal epiphysis
facies anterior
anterior surface
facies posterior
posterior surface
facies lateralis
lateral surface
margo anterior
anterior border
margo posterior
posterior border
margo interosseus
interosseous border
caput radii
head of radius
fovea articularis
articular facet
circumferentia articularis
articular circumference
collum radii
neck of radius
tuberositas radii
radial tuberosity
incisura ulnaris
ulnar notch
facies articularis carpea
carpal articular surface
processus styloideus
styloid process
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