Question

multiple choice question

the deltoid muscle is an example of what type of muscle based on fascicle arrangement?

unipennate
multipennate
bipennate

Explanation:

Identify muscle fascicle arrangement

Using the Pennate Muscle Structure knowledge point

• Pennate muscles have fascicles that attach obliquely (at an angle) to a central tendon, resembling a feather.
• Unipennate: Fascicles insert onto only one side of the tendon (e.g., extensor digitorum longus).
• Bipennate: Fascicles insert onto both sides of a central tendon (e.g., rectus femoris).
• Multipennate: Fascicles arrange obliquely around multiple central tendons, resembling several feathers converging on a single point.

Classify the deltoid muscle

Using the Pennate Muscle Structure knowledge point

• The deltoid muscle of the shoulder has a complex architecture where fascicles insert from multiple directions into several tendons.
• This specific arrangement is classified as a multipennate muscle.

Answer:

• Unipennate
• Multipennate (Correct answer)
• Bipennate