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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
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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
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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?
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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?
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