At the elbowjoint the shapes ofthe articulating surfaces and the strong collater

Question

At the elbowjoint the shapes ofthe articulating surfaces and the strong collateral ligaments allow flexion and extension but prevent other movesments On a skeleton, examine the bony components of the elbow joint. The elbow joint shares a common joint cavity with what other joint? On a model of the elbow joint, identify the two triangular shaped collateral ligaments On the lateral side, the base of the lateral (radial) collateral ligament blends and becomes continuous with the aneular ligament. The apex is attached to what bone marking on the humerus? Ulna On the medial side, descibe the attachments of the medial (ulnar) collateral ligament Humerus Radius Lateral view On a model of the elbow joint, identify the annular ligament Notice how the ligament attaches to the anterior and posterior margins of the radial notch and wraps around the radial head Speculate on the function of this ligament Radius Ulna Medial view Word Origins The ulnar nerve passes posterior to the medial epicondyle and is close to the ulnar collateral ligament. Injury to the medial epicondyle may compress the ulnar nerve and cause temporary numbness or a tingling sensation along the nerve's area of distribution-the medial aspect of the forearm and hand. For this reason, the medial epicondyle of the humerus is called the funny bone MAKING CONNECTIONS Bursae are flattened sacs lined with a symovial membrane and filled with synovial fluid. They are located at strategic locations where tendons ligaments, muscles, or skin rub against bone or neighboring soft tissue structures (see the bottorm figure on the previous page). Speculate on the function of bursae at synovial joints 91

Explanation / Answer

2.B. On the medial side the medial(ulnar) collateral ligament is attached to :

3. Function of annular liagement :

4. Functions of bursae at the synovial joint :

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