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.
Let us examine the structure of the ulna. It has several main parts:
Shaft / body (corpus ulnae / diaphysis)
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Proximal epiphysis (epiphysis proximalis)
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Proximal epiphysis (epiphysis proximalis) Distal epiphysis (epiphysis distalis)
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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) 
Posterior surface (facies posterior) 
Posterior surface (facies posterior) 
There are also the following three borders:
Anterior border (margo anterior)
The anterior border (margo anterior) 
Posterior border (margo posterior)
The posterior border (margo posterior) 
Interosseous border (margo interosseus)
On the proximal epiphysis of the ulna lies the trochlear notch (incisura trochlearis), which connects to the trochlea.
To the back of the notch lies the olecranon (olecranon) and to the front lies the coronoid process (processus coronoideus).
Slightly lateral to the coronoid process is the radial notch (incisura radialis), which connects to the head of the radius.
The tuberosity of the ulna (tuberositas ulnae), to which the brachialis is attached, can be found to the bottom of the coronoid process.
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.
The styloid process (processus styloideus) extends from the head of the ulnae.
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
