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lower humerus land marks
medial epicondyle
olecranon fossa
capitulum
trochlea
lateral epicondyle

radial landmark
head of the radius
shaft
lister’s tubercle
styloid process

landmarks of the ulna
olecranon process
body
head of the ulna
styloid process

where is the ulnar nerve path
posterior aspect of the humerus crossing to the medial side of the arm just above the olecranon, known as the cubital tunnel

elbow articulations
humeroradial joint
humeroulnar joint
radioulnar joint

humeroulnar joint
1 degree of freedom = flexion/extension
Primary hinge of elbow
joint made of the articulation between the trochlea of humerus and trochlear notch of ulna
virtually no translation

humeroradial joint
1 degree of freedom = flexion/extension
articulation of capitulum of distal humerus with head of the radius
important in transmitting loads
60% of the load is on the elbow

proximal radioulnar joint
articulation of radial notch of ulna with radial head and rim
rotational movement for supination and pronation

middle radioulnar joint
articulation of the shaft of the radius, shaft of ulna, and membrane