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Lab Activities Lab Activities Elbow Joint 1. On the skeleton and on at least two of your classmates, locate, palpate and observe the structures listed below. The reference position is the anatomical position. Not all structures are palpable on your partner. Humerus Trochlea Capitulum Medial epicondyle Lateral epicondyle Olecranon fossa Lateral supracondylar ridge Ulna Olecranon process Trochlear notch Radial notch Styloid process Coranoid process Ulnar tuberosity Radius Head Radial tuberosity Styloid process 2. On the skeleton and your partner locate the muscles listed below. Sitting Position Brachialis Brachioradialis Biceps brachii Supinator Pronator teres Pronator quadratus Prone Position Traceps brachii Anconeus 3. Assume the joint positions that shorten the biceps brachii over all the joints it file:///C|/Documents%20and%20Settings/marsettt/Desktop/Mics%20saves/Lab%20Activities%20Elbow.htm (1 of 4)2/7/2007 3:33:07 PM Lab Activities crosses. What is the effect on the triceps? Assume the joint positions that lengthen the biceps over all the joints it crosses. What is the effect on the triceps? 4. Analyze elbow extension in the following activities. First Activity: Perform a push-up from the prone position. Consider the up phase of the activity. Second Activity: In the sitting position, perform elbow extension starting with the upper extremity in full shoulder and elbow flexion. A. Which activity is an example of reversal of muscle action? B. Explain your answer C. Which activity is an example of an open chain activity? D. Which activity is an example of a closed chain activity? E. In the first activity, is traction or approximation occurring at the elbow joint? 5. Name the ring-shaped ligament within which the radius rotates. 6. Name the muscle that lies deep to the biceps near the distal end of the humerus. 7. Name the muscle that lies deep to the biceps at the shoulder. 8. Name the nerve that lies in the groove between the medial epicondyle and the olecranon process. 9. Match the nerve with the muscle it innervates (answers may be used more than once) ____ Biceps brachii A. Musculocutaneous ____ Triceps B. Radial file:///C|/Documents%20and%20Settings/marsettt/Desktop/Mics%20saves/Lab%20Activities%20Elbow.htm (2 of 4)2/7/2007 3:33:07 PM Lab Activities ____ Pronator teres C. Median ____ Supinator ____ Brachialis ____ Brachioradialis ____ Pronator quadratus 10. You are treating an individual who had a midshaft fracture of the humerus. A complication of this injury was damage to the radial nerve, resulting in paralysis. A. Which elbow and/or forearm muscles would have lost innervation? B. What motions will the individual have difficulty performing? 11. Why must a muscle attach on the radius to be able to pronate or supinate the forearm? 12. Which muscles that cause motion of the elbow joint do not attach to the radius? Do any of these muscles cause pronation or supination? 13. When elbow flexion is performed and supination is not desired, what muscle(s) prevents the supination? 14. Analyze the following two activities by answering the questions that follow. First Activity: An individual pulling on a rope attached to a boat is bringing the boat into the shore. Second Activity: An individual is climbing up a rope. A. In the first activity, which attachment of the elbow flexors is moving toward the other attachment? B. In the second activity, which attachment of the elbow flexors or moving toward the other attachment? file:///C|/Documents%20and%20Settings/marsettt/Desktop/Mics%20saves/Lab%20Activities%20Elbow.htm (3 of 4)2/7/2007 3:33:07 PM Lab Activities C. Which activity is an example of the reversal of muscle action? 15. When the radial nerve has been severed, has the ability to supinate the forearm been lost? Why? 16. lost? When the radial nerve has been severed, has the ability to extend the elbow been Why? 17. Is elbow flexion lost when the musculocutaneous nerve has been severed? Why? file:///C|/Documents%20and%20Settings/marsettt/Desktop/Mics%20saves/Lab%20Activities%20Elbow.htm (4 of 4)2/7/2007 3:33:07 PM