Chapter 8, Problem 3CT

For each of the following muscles, describe the motion(s) produced when the muscle contracts. It may be helpful to use an articulated skeleton.
a. The biceps brachii muscle attaches to the coracoid process of the scapula (one head) and to the radial tuberosity of the radius. Name two movements that the muscle accomplishes in the forearm.
b. The rectus lemons muscle attaches o the anterior inferior iliac spine and the tibial tuberosity. How does contraction move the thigh? The leg!
c. The supraspinatus muscle is located in and attached to the supra-spinatus fossa of the scapula. Its tendon runs over the head of the humerus to the greater tubercle. When it contracts, what movement occurs at the glenohumeral (shoulder) joint?
d. The gastrocnemius muscle attaches to the medical and lateral condyles of the femur and to the calcaneus. What movement at leg results when this muscle contracts? Of the foot?