Category
page 1Ulna

ulna
thumb|Right ulna, lateral aspect. (After Piersol.)
thumb|Right ulnar bone, medial aspect. (After Piersol.)

olecranon
The olecranon (, ), is a large, thick, curved bony process on the proximal, posterior end of the ulna. It forms the protruding part of the elbow and is opposite to the cubital fossa or elbow pit (trochlear notch). The olecranon serves as a lever for the extensor muscles that straighten the elbow joint.
Tuberosity of the ulna
coronoid process of the ulna
bone in the arm
ulnar styloid process
styloid process of the ulna
radial notch
Dent of the ulna receiving the radius
trochlear notch