Radius & Ulna (Forearm): Bone Landmarks, Joints & Functions | Anatomy

Опубликовано: 30 Апрель 2026
на канале: Taim Talks Med

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Content:
00:00 Introduction & Content
00:39 Radius Anatomy
00:57 Proximal Radius
02:36 Shaft/body of Radius
03:57 Distal Radius
05:40 Ulna Anatomy
05:51 Proximal Ulna
07:38 Shaft/body of Ulna
08:22 Distal Ulna
09:15 Ulna and Radius Movement Animation
09:37 Joints between Radius and Ulna
11:10 Outro & Next topic

Radius (Radius)

Head of radius (Caput radii) – Articulates with capitulum of humerus and radial notch of ulna.
Articular facet (Fovea articularis) – Shallow depression on top of the head.
Articular circumference (Circumferentia articularis) – Lateral surface of head, contacts ulna.
Neck of radius (Collum radii) – Narrow section between head and shaft.
Radial tuberosity (Tuberositas radii) – Biceps brachii insertion site.
Anterior border (Margo anterior) – Border facing front.
Interosseous border (Margo interosseus) – Medial margin; attachment for interosseous membrane.
Posterior border (Margo posterior) – Less distinct, on posterior aspect.
Anterior surface (Facies anterior) – Between anterior and interosseous borders.
Posterior surface (Facies posterior) – Between posterior and interosseous borders.
Lateral surface (Facies lateralis) – Outer surface of shaft.
Styloid process (Processus styloideus radii) – Lateral wrist projection; attachment for radial collateral ligament.
Suprastyloid crest (Crista suprastyloidea) – Just above styloid; brachioradialis insertion.
Dorsal radial tubercle (Tuberculum dorsale radii) – Lister’s tubercle; pulley for extensor pollicis longus.
Ulnar notch of radius (Incisura ulnaris) – Medial indentation; articulates with ulna.
Carpal articular surface (Facies articularis carpea) – Inferior surface; articulates with scaphoid and lunate.

Ulna (Ulna)

Olecranon (Olecranon) – Proximal posterior projection; fits into olecranon fossa.
Trochlear notch (Incisura trochlearis) – Large anterior C-shaped articular surface.
Coronoid process (Processus coronoideus) – Anterior projection; fits into coronoid fossa.
Sublime tubercle (Tuberculum subliminale) – Medial side of coronoid; ligament/muscle attachment.
Radial notch (Incisura radialis) – Lateral surface; articulates with radius.
Ulnar tuberosity (Tuberositas ulnae) – Just below coronoid; brachialis insertion site.
Anterior border (Margo anterior) – Front margin of shaft.
Interosseous border (Margo interosseus) – Lateral edge; attachment for interosseous membrane.
Supinator crest (Crista m. supinatoris) – Near top of interosseous border; supinator origin.
Posterior border (Margo posterior) – Subcutaneous ridge down posterior side.
Anterior surface (Facies anterior)
Posterior surface (Facies posterior)
Medial surface (Facies medialis)
Head of ulna (Caput ulnae) – Rounded distal end.
Styloid process (Processus styloideus ulnae) – Medial wrist projection.
Articular circumference (Circumferentia articularis ulnae) – Surface around head; fits into radius.
Articular facet (Facies articularis) – Lateral part of ulnar head; part of TFCC.

Joints

Proximal radioulnar joint (Articulatio radioulnaris proximalis) – Pivot joint between radial head and radial notch of ulna.
Distal radioulnar joint (Articulatio radioulnaris distalis) – Between ulnar head and ulnar notch of radius.
Radiocarpal joint (Articulatio radiocarpalis) – Between distal radius and scaphoid/lunate.
Humeroradial joint (Articulatio humeroradialis) – Capitulum with radial head.
Humeroulnar joint (Articulatio humeroulnaris) – Trochlea with trochlear notch.

Other Structures

Interosseous membrane – Strong fibrous sheet between shafts.
Oblique cord – Small band from ulna to radius, near radial tuberosity.
Palmar & dorsal radioulnar ligaments – Stabilize distal radioulnar joint.

Sources:
Memorix Anatomy
Gray’s Anatomy for Students (41st ed.)
Acland’s Video Atlas of Human Anatomy
Atlas of Human Anatomy – Frank H. Netter
Essential Clinical Anatomy – Moore
Inderbir Singh’s Textbook of Human Osteology
Kenhub (as secondary source)

Programs used:
Complete Anatomy, 3D visuals, PowerPoint, Camtasia, Canva.

Skills used:
My brain🤓