The orbicularis oris muscle has origins at _____ and _____; its main action is to _____.
The orbicularis oris muscle has origins at _____ and _____; its main action is to _____.
| A. |
occipital and temporal bones; raise eyebrows |
|
| B. |
frontal and maxillary bones; close eyes |
|
| C. |
zygomatic and maxillary bone; smile |
|
| D. |
maxilla and mandible; close lips |
The biceps brachii muscle inserts at ______; its main action is _____ and _____.
| A. |
distal phalanges of fingers; extension of fingers |
|
| B. |
olecranon of ulna; extension of forearm |
|
| C. |
radial tuberosity; flexion of elbow and supination of forearm |
|
| D. |
palmar aponeurosis; tenses skin of palm |
In naming muscles according to direction of muscle fibers, _____ means "straight" in reference to the midline of the body; while _____ means the muscle fibers of that muscle are running "at right angles".
| A. |
transverse, rectus |
|
| B. |
rectus, transverse |
|
| C. |
rectus, oblique |
|
| D. |
oblique, rectus |
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