Which layer is the abductor hallucis located in?

Which layer is the abductor hallucis located in?

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

Answer: (B)

The main concept is how the intrinsic muscles of the sole are organized into layers and how to identify which muscle sits in which layer. The abductor hallucis is a muscle on the medial side of the sole that functions to abduct the big toe. It lies in the most superficial layer of the plantar muscles, alongside two others in that same layer. This layer is defined by the presence of these three muscles, making it the proper home for the abductor hallucis. Deeper layers contain different muscle groups, such as the second layer with quadratus plantae and the lumbricals, and the third layer with flexor hallucis brevis and adductor hallucis, among others. The term neurovascular layer refers to the planes where nerves and vessels run between muscle layers, not to a muscular group, so it isn’t where a muscle like the abductor hallucis is classified.

The main concept is how the intrinsic muscles of the sole are organized into layers and how to identify which muscle sits in which layer. The abductor hallucis is a muscle on the medial side of the sole that functions to abduct the big toe. It lies in the most superficial layer of the plantar muscles, alongside two others in that same layer. This layer is defined by the presence of these three muscles, making it the proper home for the abductor hallucis. Deeper layers contain different muscle groups, such as the second layer with quadratus plantae and the lumbricals, and the third layer with flexor hallucis brevis and adductor hallucis, among others. The term neurovascular layer refers to the planes where nerves and vessels run between muscle layers, not to a muscular group, so it isn’t where a muscle like the abductor hallucis is classified.