THE ELBOW & RADIOULNAR JOINT

I. Major Bones

1. ULNA
2. RADIUS
3. HUMERUS

II. Bony Landmarks

A.HUMERUS

1. Trochlea

a. medial anterior surface of distal humerus

b. hourglass shaped

2. Trochlear groove: skinny part of hourglass

3. Medial and lateral epicondyles medial is more pronounced

4. Capitulum

a. lateral, anterior surface of humerus

b. circular (ball)

5. Capitulotrochlear groove between capitulum and trochlea

6. Radial Fossa : anterior surface, above capitulum, lateral humerus

7. Coronoid Fossa: anterior surface, above trochlea, medial humerus

8. Olecranon Fossa: posterior surface

9. Medial and lateral supracondylar ridges

B. ULNA (anterior, posterior, medial, lateral surfaces)

1. Trochlear (semilunar) notch

2. Trochlear Ridge

3. Olecranon Process: superior to trochlear notch

4. Coranoid Process: distal to trochlear notch

5. Radial Notch: lateral ulna, point of radial contact

6. Styloid Process: distal end of ulna

7. Head: medial to styloid process

8. Interosseous border : straight down from radial notch, lateral

9. Supinator crest: lateral, proximal ulna

10. Groove for extensor carpi ulnaris: between styloid process and ulnar head

C. RADIUS

1. Head
2. Rim: wraps around head of radius
3. Radial (biceps) tuberosity : proximal surface
4. Ulnar Notch: lateral, distal surface, articulates with ulna
5. Styloid Process :point at distal end of medial ulnar surface
6. Grooves for extensor carpi radialis brevis and longus: groove for ECR brevis is lateral to groove for ECR longus

Category: Anatomy Notes