Which statement about the flexor digitorum brevis split is correct?

Which statement about the flexor digitorum brevis split is correct?

• A. It splits at the base of the proximal phalanx, digits 2-5
• B. It splits at the base of the distal phalanx, digits 2-5
• C. It splits at the calcaneal tuberosity
• D. It splits at the metatarsophalangeal joints

Answer: (A)

The key idea is where the flexor digitorum brevis tendon divides as it reaches the toes. The FDB originates from the calcaneus and plantar fascia, then splits into two slips at the base of the proximal phalanx of digits 2–5. These two slips spread to the sides of the middle phalanx of those digits, allowing the flexor digitorum longus tendons to pass between them toward the distal phalanges while the FDB itself flexes the proximal joints. Therefore, splitting at the base of the proximal phalanx for digits 2–5 is the correct description. The other options don’t match this anatomical split point or the involved digits.

The key idea is where the flexor digitorum brevis tendon divides as it reaches the toes. The FDB originates from the calcaneus and plantar fascia, then splits into two slips at the base of the proximal phalanx of digits 2–5. These two slips spread to the sides of the middle phalanx of those digits, allowing the flexor digitorum longus tendons to pass between them toward the distal phalanges while the FDB itself flexes the proximal joints.

Therefore, splitting at the base of the proximal phalanx for digits 2–5 is the correct description. The other options don’t match this anatomical split point or the involved digits.