The 3 plantar interossei are located in which layer?

The 3 plantar interossei are located in which layer?

• A. 1st layer
• B. 2nd layer
• C. 3rd layer
• D. 4th layer

Answer: (D)

The muscles of the sole are organized in four layers from superficial to deep. The plantar interossei are three small intrinsic muscles that adduct the toes toward the second toe, and they sit in the deepest plantar layer—the fourth layer. This layer also houses the interossei, distinct from the muscles in the superficial first layer (abductor hallucis, flexor digitorum brevis, abductor digiti minimi), the second layer (quadratus plantae and lumbricals), and the third layer (flexor hallucis brevis, adductor hallucis, and flexor digiti minimi brevis). A handy memory cue is PAD for plantar interossei adducting the toes (DAB would abduct).

The muscles of the sole are organized in four layers from superficial to deep. The plantar interossei are three small intrinsic muscles that adduct the toes toward the second toe, and they sit in the deepest plantar layer—the fourth layer. This layer also houses the interossei, distinct from the muscles in the superficial first layer (abductor hallucis, flexor digitorum brevis, abductor digiti minimi), the second layer (quadratus plantae and lumbricals), and the third layer (flexor hallucis brevis, adductor hallucis, and flexor digiti minimi brevis). A handy memory cue is PAD for plantar interossei adducting the toes (DAB would abduct).