HUMEROULNAR JOINT
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16.7.05
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You are here: Home » Anatomy Notes » HUMEROULNAR JOINT
2. ARTICULATING SURFACES
- Proximal: trochlea and trochlear groove of humerus
- Distal: trochlear (semilunar) notch of ulna and trochlear ridge
3. MOVEMENTS: flexion/extension
- Plane: sagittal
- Axis: medial/lateral
(1.) During extension the olecranon process of the ulna articulates with the olecranon fossa of the humerus.
(2.) During flexion the coranoid process of the ulna articulates with the coranoid fossa of the humerus.• The ability to hyperextend the elbow indicates a smaller olecranon process or a larger olecranon fossa.• Due to trochlear assymetry, in the extended position an angle is created laterallybetween the ulna and humerus (“Carrying Angle”) which normally disappears when the forearm is pronated while extended. (Men ≅10°-15°; Women ≅20°-25°)
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2 comments:
I think there is an error here. Shouldn't it be the distal end of the humerus and the proximal end of the ulna?? You have it the other way around.
There is no error. The proximal articulating surface is that of the Humerus and the distal articulating surface is of the Ulna.
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