Ulna

Ulna: Anatomy & FunctionKey facts about the anatomy of the ulnar bone
~ 3 min

The forearm (antebrachium) is composed of two bones — the ulna (ulna) and the radius (radius). In the standard anatomical condition, in which the palms are turned upward, and the thumb looks outward, the ulna is medial, and the radius is lateral.

Ulna (ulna)
Ulna (ulna)

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

  • Shaft / body (corpus ulnae / diaphysis)

Shaft / body (corpus ulnae / diaphysis)
Shaft / body (corpus ulnae / 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)

  • Medial surface (facies medialis)

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

    There are also the following three borders:

  • Anterior border (margo anterior)

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

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

The interosseous border (margo interosseus)
The interosseous border (margo interosseus)

On the proximal epiphysis of the ulna lies the trochlear notch (incisura trochlearis), which connects to the trochlea.

Trochlear notch (incisura trochlearis)
Trochlear notch (incisura trochlearis)

To the back of the notch lies the olecranon (olecranon) and to the front lies the coronoid process (processus coronoideus).

Olecranon (olecranon)
Olecranon (olecranon)
Coronoid process (processus coronoideus)
Coronoid process (processus coronoideus)

Slightly lateral to the coronoid process is the radial notch (incisura radialis), which connects to the head of the radius.

Radial notch (incisura radialis)
Radial notch (incisura radialis)

The tuberosity of the ulna (tuberositas ulnae), to which the brachialis is attached, can be found to the bottom of the coronoid process.

Tuberosity of the ulna (tuberositas ulnae)
Tuberosity of the ulna (tuberositas ulnae)

On the distal epiphysis is the head of the ulna (caput ulnae), with the articular circumference (circumferentia articularis) on its lateral surface. It is connected to the radius.

Head of the ulna (caput ulnae)
Head of the ulna (caput ulnae)
Articular circumference (circumferentia articularis)
Articular circumference (circumferentia articularis)

The styloid process (processus styloideus) extends from the head of the ulnae.

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

Ulna

antebrachium
forearm
ulna
ulna
radius
radius
corpus ulnae/diaphysis
shaft/diaphysis
epiphysis proximalis
proximal epiphysis
epiphysis distalis
distal epiphysis
facies anterior
anterior surface
facies posterior
posterior surface
facies medialis
medial surface
margo anterior
anterior border
margo posterior
posterior border
margo interosseus
interosseous border
incisura trochlearis
trochlear notch
olecranon
olecranon
processus coronoideus
coronoid process
incisura radialis
radial notch
tuberositas ulnae
tuberosity of ulna
caput ulnae
ulnar head
circumferentia articularis
articular circumference
processus styloideus
styloid process
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