The flexor tendons have been cut off and removed. The plantar interosseous fascia has been removed distally nearly as far as the heads of the metatarsals. The transverse and oblique heads of the adductor hallucis (3, 5) have been uncovered.
Flexor hallucis longus muscle (tendon, cut off in digital sheath)
Synovial sheath
Transverse head of adductor hallucis muscle
Metatarsal bone
Oblique head of adductor hallucis muscle
Medial cuneiform bone
Tuberosity of navicular bone
Tibialis posterior muscle (tendon of insertion)
Groove for flexor digitorum longus muscle
Groove for flexor hallucis longus muscle
Plantar aponeurosis (attachment to tuberosity of calcaneus)
Flexor tendons (cut off in digital sheaths)
4th lumbrical muscle
Branch of deep plantar nerve to adductor hallucis
Interosseous muscle
Plantar metatarsal artery
Flexor digiti minimi brevis muscle
Tuberosity of 5th metatarsal bone
Deep branch lateral plantar nerve
Peroneus longus muscle (tendon, covered by ligaments)