Chicken Wing Disection 1. Locate the triceps brachii and biceps brachii on the w

Question

Chicken Wing Disection

1. Locate the triceps brachii and biceps brachii on the wing. Lift the wing, as demonstrated in the video, and gently pull on the biceps – what happens? Do the same with the triceps – what happens? What kind of a relationship is demonstrated here, what is happening to the triceps when the biceps is contracting, and what is happening to the biceps when the triceps is contracting?

2. Repeat this procedure on the muscles in the forewing, alternate pulling on the flexors and the extensors, what do you see here?

3. Once you have the bones exposed you can dissect the elbow joint, remove the ligaments and dislocate the ulna from the humerus. Examine the distal end of the humerus and the proximal ends of the radius and ulna – what do you see on the ends of these bones?

Explanation / Answer

1) Biceps and triceps are antagonistic muscles. Biceps causes flexion and triceps causes extension. When biceps is contracting, the triceps elongates or relaxes. Similarly, when triceps contracts, biceps elongates and relaxes.

2) Pulling or contraction of the flexor muscles causes lengthening of extensor muscles and vice versa.

3) The ends of humerus, radius and ulna are covered by articular cartilages.

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