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Multiple Choice
The extensor digitorum muscle is an example of a __________ muscle.
A
circular
B
convergent
C
pennate
D
fusiform
Verified step by step guidance
1
Understand the types of muscle fiber arrangements: Circular muscles form rings and control openings, convergent muscles have a broad origin and converge to a single tendon, pennate muscles have fibers that attach obliquely to a central tendon, and fusiform muscles are spindle-shaped with a central belly.
Identify the function and structure of the extensor digitorum muscle: It is responsible for extending the fingers and is located in the forearm.
Recognize that the extensor digitorum muscle has a structure where muscle fibers attach obliquely to a central tendon, which is characteristic of a pennate muscle.
Differentiate between the types of pennate muscles: Unipennate muscles have fibers on one side of the tendon, bipennate have fibers on both sides, and multipennate have multiple rows of fibers attached to a central tendon.
Conclude that the extensor digitorum muscle is a pennate muscle due to its fiber arrangement, which allows for greater force production compared to parallel fiber arrangements.