Tibia nerve is the larger terminal branch of the sciatic nerve with root values of L4, L5, S1, S2, and S3. It lies superficial to the popliteal vessels, extending from the superior angle to the inferior angle of the popliteal fossa, crossing the popliteal vessels from lateral to medial side. It gives off branches as shown below:
Cutaneous branches - Tibial nerve also gives off a cutaneous nerve called the medial sural nerve from the middle of the popliteal fossa and exits at the inferior angle. It supplies the skin of the lower half of the back of the leg and lateral border of the foot until the tip of the little toe.
Articular branches - There are three articular branches arises from the upper part of the fossa: superior medial genicular nerve.
Back of the leg
At the inferior angle of the popliteal fossa, tibial nerve passes deep to the tendinous arch of soleus to enter the back of the leg. In the leg, it runs downwards and medially to reach the posteromedial side of the ankle, midway between the medial malleolus and medial tubercle of the calcaneum. It terminates deep to the flexor retinaculum at the origin of the abductor hallucis by dividing into medial and lateral plantar nerves to supply the foot. The tibial nerve gives off several branches to supply the back of the leg:
In the foot, the nerve terminates by dividing into medial and lateral plantar branches.
Medial plantar nerve - It is the larger terminal branch of the tibial nerve. It passes between the abductor hallucis and flexor digitorum brevis to divide further into branches. Its distribution resembles to that of the distribution of median nerve in the hand. Its muscular branches supply the abductor hallucis, the flexor digitorum brevis, the flexor hallucis brevis and the first lumbrical. Cutaneous distribution of the medial plantar nerve supplies the medial sole and medial three and one half toes through four digital branches. Each digital branch give off a dorsal branch to supply the nail beds on the dorsum. This nerve also gives off articular branches to supply the bones of the tarsus and metatarsus.
Lateral plantar nerve - It is the smaller terminal branch of the tibial nerve. It courses laterally and forward until the base of fifth metatarsal bone, where it divides into superficial and deep branches. Its distribution resembles to the distribution of ulnar nerve in the hand. The main trunk of the nerve supplies two muscles: flexor digitorum accessorius and abductor digiti minimi. This nerve also supplies the skin of the sole. The superficial branch is divided into medial and lateral branches. The lateral branch supplies three muscles: flexor digiti minimi, 3rd and 4th interossei, and the skin over the lateral side of the toe. The medial branch communicates with the medial plantar nerve and supplies the skin over the fourth interdigital cleft. The deep branch supplies the 2nd, 3rd, and 4th lumbricals, first and second plantar interossei and adductor hallucis.
Clinical Significance
Damage to the tibial nerve is rare, and is often a result of direct trauma, entrapment through narrow space or compression for long period of time. Damage results in loss of plantar flexion, loss of flexion of toes and weakened inversion.
