Trochlear notch

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Semilunar notch

Upper extremity of left ulna. Lateral aspect. (Semilunar notch visible at center top.)
Latin	Incisura trochlearis ulnae, incisura semilunaris ulnae
Gray's	p.215

The semilunar notch of the ulna (trochlear notch of ulna, greater sigmoid cavity) is a large depression, formed by the olecranon and the coronoid process, and serving for articulation with the trochlea of the humerus.

About the middle of either side of this notch is an indentation, which contracts it somewhat, and indicates the junction of the olecranon and the coronoid process.

The notch is concave from above downward, and divided into a medial and a lateral portion by a smooth ridge running from the summit of the olecranon to the tip of the coronoid process.

The medial portion is the larger, and is slightly concave transversely; the lateral is convex above, slightly concave below.

External links

SUNY Figs 10:06-02
Bioweb at UWLAX Right ulna (anterior - proximal end)
Upperextremity/arm/radiology/lat-elbow at the Dartmouth Medical School's Department of Anatomy

This article incorporates text from a public domain edition of Gray's Anatomy.

Bones of upper limbs (TA A02.4, GA 2.200–230)

Pectoral girdle, clavicle

Scapula

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

Humerus

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

Forearm

radius: upper extremity (head, tuberosity)
body
lower extremity (ulnar notch, styloid process)
ulna: upper extremity (tuberosity, olecranon, coronoid process, radial notch, trochlear notch)
body
lower extremity (head, styloid process)

Hand

carpus: scaphoid
lunate
triquetral
pisiform
trapezium
trapezoid
capitate
hamate (hamulus)
metacarpus: 1st metacarpal
2nd
3rd
4th
5th
phalanges of the hand: proximal
intermediate
distal

M: BON/CAR

anat (c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug (M5)

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