Week #4: Muscle Anatomy and Movement Analysis
1. For each of the muscles studied in this lab, you should know the location of the
muscle and the joint movements that it performs.
2. You should be able to analyze the joint actions and muscles involved (prime
movers only) in any movement. You must follow the movement analysis style
described on pages 9-25 to 9-26 in the BPK 142 Laboratory Manual.
3. Describe the role played by the gluteus maximus muscle in walking, running, and
weakly activated in walking
strongly activated in running, climbing up stairs
As you run/walk, gluteus maximus tightens and helps to maintain your balance.
4. If your deltoid muscles were paralyzed, how would this affect the activities which
you are able to perform?
Unable to conduct the following movements at the shoulder joints: flexion, horizontal flexion,
abduction, horizontal extension, and extension.
5. In a duel in 1547, Jarnac defeated Chastaigneraie by slicing through the tissue
behind the left knee. This is known in history as the "coup de Jarnac". Which
muscles would be affected by such a cut. Would the victim be able to walk and/or
Muscles at the knee joint: hamstrings, gastrocnemius, soleus
When a muscle is injured, the immune system "cleans up" the site of the injury via the
there are limitations to muscular regeneration. The muscle tissue seems to require signals
from our nervous system, and injuries that are too large fail to heal correctly. Often, in cases
like this, a fatty tissue forms in place of healthy striated muscle.
6. Describe four possible movements of the humerus that can occur at the shoulder
joint, and name the prime mover(s) of each movement.
4 Extension: posterior deltoid, pectoralis major, latissimus dorsi, triceps brachii
3 Flexion: anterior deltoid, pectoralis major, biceps brachii
2 Horizontal Flexion: anterior deltoid, pectoralis major
1 Abduction: middle deltoid
7. Why would individuals accustomed to wearing high-heeled shoes experience
discomfort when wearing low-heeled shoes? Where might the discomfort be
found and what are some possible anatomic and mechanical reasons?
Used to plantar flexion. Muscles of hamstrings, achilles tendon shortened, bunions. Low heels
will cause achilles tendon to stretch longer.
8. How is walking different from running with regard to the use of hip joint muscle
actions and range of motion?
Gluteus maximus strongly activated when running. Larger ROM.
Weakly activated when walking