Atlas of Human Anatomy in Cross Section: Section 7. Lower Limb

Plate 7.37

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
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This section passes through the third and fourth layers of the muscles of the foot. It is in the plane of the tendon of peroneus longus (22) and its insertion inferolaterally onto the base and side of the first metatarsal (4). The peroneus longus muscle also inserts onto the inferior surface of the first cuneiform bone. In addition, the muscle usually sends a fibrous slip to the base of the fifth metatarsal. The section cuts the interosseous muscles (25) and other intrinsic foot muscles, including extensor digitorum brevis (2, 26, 29), quadratus plantae (11), and the adductor (16) and abductor hallucis muscles (8). It cuts the tuberosity of the calcaneus (13); the first (4), second (30), third (27), fourth (23), and fifth (20) metatarsals; and the cuboid (19).

Extensor digitorum brevis is the only muscle on the dorsum of the foot. It arises from the dorsal and lateral surfaces of the calcaneus and divides into four muscle bellies whose tendons insert onto the proximal phalanges of the four medial toes just lateral and deep to the tendons of extensor digitorum longus. The belly to the great toe is named extensor hallucis brevis.

Adductor hallucis (16) is composed of two heads, an oblique and a transverse. The oblique head extends from the long plantar ligament to the lateral side of the base of the proximal phalanx of the great toe. Its tendon of insertion is Joined by the transverse head that arises from the capsules of the third, fourth, and fifth metatarsophalangeal joints.

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