Final answer:
Muscle names are based on various characteristics including location, size, shape, origin, insertion, and action. For example, the biceps brachii muscle is named based on its number of origins.
Step-by-step explanation:
Naming Skeletal Muscles:
Muscle names are based on many characteristics. The location of a muscle in the body is important. Some muscles are named based on their size and location, such as the gluteal muscles of the buttocks. Other muscle names can indicate the location in the body or bones with which the muscle is associated, such as the tibialis anterior. The shapes of some muscles are distinctive; for example, the direction of the muscle fibers is used to describe muscles of the body midline. The origin and/or insertion can also be features used to name a muscle; examples are the biceps brachii, triceps brachii, and the pectoralis major.
The number of origins, action, location, and fiber direction are all features that can be used to match each muscle name with its corresponding feature:
Internal: Location
Rectus: Fiber direction
Biceps: Number of origins
Abductor: Action