Which one of the following muscles performs the movement shown in the image below?

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First, let’s identify what movement is depicted in the image. The red arrows indicate movement of the toes away from the midline of the foot, which corresponds to abduction of the toes. Understanding which muscles perform abduction or adduction of the toes will guide us to the correct choice.

Option a. Dorsal interossei: These muscles are responsible for toe abduction, meaning they move the toes away from the second toe. Given that the image shows toes spreading apart laterally, this option aligns with the described action.

Option b. Lumbricals: The lumbricals primarily flex the metatarsophalangeal joints and extend the interphalangeal joints of the toes; they do not primarily cause abduction or adduction of the toes. Therefore, this choice does not fit the movement shown.

Option c. Plantar interossei: These muscles adduct the toes toward the second toe. If the arrows depicted spreading away from the midline were the action, plantar interossei would be incorrect. They would be the match if the movement were toward the midline.

Option d. Quadratus plantae: The quadratus plantae assists toe flexion by redirecting the pull of the flexor digitorum longus. It does not primarily cause toe abduction or adduction, so it’s not the main mover in this context.

Option e. Adductor hallucis: This muscle adducts the big toe (hallux) toward the second toe. It does not govern the abduction of digits 2–5, making it unlikely to be the muscle shown in the image.

In summary, the movement depicted corresponds to toe abduction, which is chiefly produced by the dorsal interossei. The other options either describe movements not shown (flexion/extension roles) or actions not consistent with toe abduction as illustrated.

ANAT1452-Functional Anatomy & Biomechanics 2, T3 2025

Which one of the following muscles performs the movement shown in the image below?

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