Peroneus longus

Peroneus Longus is a muscle located in the lower limb, specifically within the lateral compartment of the leg. It plays a crucial role in foot and ankle movement, particularly in the eversion and plantarflexion of the foot. The anatomy, innervation, function, and clinical significance of the Peroneus Longus are essential for understanding various aspects of lower limb biomechanics and pathology.

Anatomy

The Peroneus Longus, also known as the fibularis longus, originates from the head and upper two-thirds of the lateral surface of the fibula. It runs obliquely downwards and backwards along the lateral side of the leg, behind the Peroneus Brevis muscle, and under the foot. It inserts into the base of the first metatarsal and the medial cuneiform bone of the foot.

Innervation

The Peroneus Longus is innervated by the superficial peroneal nerve, a branch of the common peroneal nerve, which is itself a branch of the sciatic nerve. This innervation is crucial for the muscle's function in foot and ankle movements.

Function

The primary function of the Peroneus Longus is to evert and plantarflex the foot at the ankle joint. It also supports the transverse and longitudinal arches of the foot. During activities such as walking, running, or standing on uneven ground, the Peroneus Longus works to stabilize the foot and ankle, providing balance and support.

Clinical Significance

Injuries to the Peroneus Longus can occur due to trauma, overuse, or anatomical variations. Symptoms may include pain, weakness, and instability in the foot and ankle. Conditions such as peroneal tendonitis, tears, or subluxation can affect the Peroneus Longus, impacting foot and ankle function. Treatment options vary depending on the severity of the condition and may include rest, physical therapy, or surgery.

Related Pages

• Peroneus Brevis
• Common Peroneal Nerve
• Sciatic Nerve
• Ankle Joint
• Foot Anatomy