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This arrangement of dorsal interossei makes the second toe the midline of the foot, whereas the midline of the hand (marked by dorsal interossei of hand) is in the third finger. [2] Abduction is of little importance in the foot, but, together with the plantar interossei, the dorsal interossei also produce flexion at the metatarsophalangeal joints.
The muscle passes under the superior and inferior extensor retinaculum of foot in company with the fibularis tertius, and divides into four slips, which run forward on the dorsum of the foot, and are inserted into the second and third phalanges of the four lesser toes.
The fibres pass obliquely forwards and medially across the dorsum of the foot and end in four tendons. The medial part of the muscle, also known as extensor hallucis brevis , ends in a tendon which crosses the dorsalis pedis artery and inserts into the dorsal surface of the base of the proximal phalanx of the great toe.
Additional images. Ext. hallucis brevis labeled at center. Dorsum of foot. Deep dissection. ... "Dorsum of the foot showing the tendons that cross the ankle joint."
L5 – On the dorsum of the foot at the third metatarsophalangeal joint. S1 – On the lateral aspect of the calcaneus. S2 – At the midpoint of the popliteal fossa. S3 – Over the tuberosity of the ischium or intragluteal fold; S4 and S5 – In the perianal area, less than one cm lateral to the mucocutaneous zone
The intermediate dorsal cutaneous nerve divides into four dorsal digital branches, which supply the medial and lateral sides of the third and fourth, and of the fourth and fifth toes. The lateral dorsal cutaneous nerve from the sural nerve turns into a dorsal digital nerve and supplies the lateral side of the fifth toe.
The medial dorsal cutaneous nerve (internal dorsal cutaneous branch) is the more medial one of the two terminal branches of the superficial fibular nerve (the other being the intermediate dorsal cutaneous nerve). Through its branches, it provides innervation to parts of the dorsal aspects of the first, second, and third toes.
Through its two terminal branches, the intermediate dorsal cutaneous nerve provides sensory innervation to the contiguous dorsal aspects of the 3rd and 4th toes, and of the 4th and 5th toes. [citation needed] It also provides innervation to the skin of the lateral side of the foot and ankle. [citation needed]