Fibular nerve innervates muscles of the lateral leg from "summary" of Bd Chaurasia's Human Anatomy, Volumes 3 & 4 by B. D. Chaurasia
The fibular nerve is responsible for innervating the muscles located on the lateral aspect of the leg. This nerve arises from the sacral plexus and passes through the popliteal fossa to enter the lateral compartment of the leg. The fibular nerve gives off branches to various muscles in this region, providing them with motor innervation. One of the main muscles innervated by the fibular nerve is the fibularis longus muscle. This muscle originates from the head and upper part of the lateral surface of the fibula and extends to the base of the first metatarsal bone. The fibularis longus muscle is involved in eversion and plantar flexion of the foot. Another important muscle innervated by the fibular nerve is the fibularis brevis muscle. This muscle also originates from the fibula but inserts onto the base of the fifth metatarsal bone. The fibularis brevis muscle assists in eversion and plantar flexion of the foot, working in conjunction with the fibularis longus muscle. The fibular nerve also provides innervation to the extensor digitorum longus muscle, which lies on the anterior aspect of the leg. This muscle extends the toes and dorsiflexes the foot. Additionally, the fibular nerve innervates the tibialis anterior muscle, which is also located on the anterior aspect of the leg and is responsible for dorsiflexion and inversion of the foot. In summary, the fibular nerve plays a crucial role in providing motor innervation to the muscles of the lateral leg. By supplying these muscles with the necessary nerve impulses, the fibular nerve enables movements such as eversion, dorsiflexion, and plantar flexion of the foot.
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