UE Arm: Bony Features, Attachments, Joints

Question 1

What are the relevant bony features of the humerus?

Answer 1

1. Head of Humerus
2. Greater tubercle (lateral)
3. Intertubercular sulcus (Biceps long head tendon)
4. Lesser tubercle (medial)
5. Surgical neck
6. Deltoid Tuberosity
7. Radial groove
8. Lateral epicondyle (common extensor origin)
9. Coronoid fossa (anterior side between epicondyles)
10. Medial Epicondyle (common flexor origin)
11. Groove for Ulnar n (medial epicondyle, posterior)
12. Capitulum (lateral, articulates w/ radius)
13. Trochlea (medial, articulates w/ ulna)
14. Olecranon fossa (posterior, medial)

Question 2

What are the relevant bony features of the radius?

Answer 2

1. Head of radius
2. Neck
3. Tuberosity of radius (biceps brachii)
4. Styloid process of radius (distal)

Question 3

What are the relevant features of the ulna?

Answer 3

1. Olecranon (posterior)
2. Trochlear notch (anterior, artic w/ trochlea of humerus)
3. Coronoid process (anterior/inferior point of trochlear notch)
4. Ulnar head (distal)
5. Styloid process of ulna (distal)