Ulnar notch of the radius

Ulnar notch of the radius
Bones of left forearm. Anterior aspect. (Ulnar notch visible but not labeled.)
Details
Identifiers
Latin	incisura ulnaris radii
TA	A02.4.05.019
FMA	75082
*Anatomical terminology* [edit on Wikidata]

"Sigmoid cavity" redirects here. For Greater sigmoid cavity, see Trochlear notch.

The articular surface for the ulna is called the ulnar notch (sigmoid cavity) of the radius; it is in the distal radius, and is narrow, concave, smooth, and articulates with the head of the ulna forming the distal radioulnar joint.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

Bones of the arm

Shoulder girdle, clavicle

Scapula

fossae (subscapular, supraspinatous, infraspinatous)
notches (suprascapular, great scapular)
glenoid cavity
tubercles (infraglenoid, supraglenoid)
spine of scapula
acromion
coracoid process
angles (superior, inferior, lateral)

Humerus

upper extremity: necks (anatomical, surgical)
tubercles (greater, lesser)
bicipital groove
body: radial sulcus
deltoid tuberosity
lower extremity: capitulum
trochlea
epicondyles (lateral, medial)
supracondylar ridges (lateral, medial)
fossae (radial, coronoid, olecranon)

Forearm

Radius	proximal (head, tuberosity) distal (ulnar notch, styloid process, Lister's tubercle)

Ulna	upper extremity (tuberosity, olecranon, coronoid process, radial notch, trochlear notch) body lower extremity (head, styloid process)

Hand

Carpal bones	scaphoid lunate triquetral pisiform trapezium trapezoid capitate hamate hamulus

Metacarpal bones	1st 2nd 3rd 4th 5th

Phalanges	proximal intermediate distal

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