Peroneus muscles

Peroneus Muscles

The Peroneus muscles, also known as the fibularis muscles, are a group of muscles in the leg. They are named after the fibula bone, which is situated on the outer side of the lower leg. The peroneus muscles are primarily responsible for eversion and plantar flexion of the foot.

Etymology

The term "peroneus" comes from the Greek word "perone", meaning pin or brooch. This is in reference to the shape of the fibula, which is long and slender like a pin. The term "fibularis" is derived from the Latin word "fibula", meaning clasp or buckle, again referring to the shape of the fibula bone.

Anatomy

The peroneus muscles consist of three separate muscles: the Peroneus Longus, the Peroneus Brevis, and the Peroneus Tertius.

Peroneus Longus

The Peroneus Longus originates from the upper part of the fibula and the adjacent part of the tibia. It runs downwards and backwards to the underside of the foot.

Peroneus Brevis

The Peroneus Brevis is a shorter muscle that lies underneath the Peroneus Longus. It originates from the lower two-thirds of the fibula and runs downwards to the outer part of the foot.

Peroneus Tertius

The Peroneus Tertius is a small muscle that originates from the lower third of the fibula and the interosseous membrane. It runs downwards and forwards to the dorsal surface of the foot.

Function

The primary function of the peroneus muscles is to control eversion and plantar flexion of the foot. Eversion is the movement of the sole of the foot away from the midline of the body, while plantar flexion is the movement of the foot that flexes the foot or toes downward toward the sole.

Clinical Significance

Damage to the peroneus muscles can result in foot drop, a condition where the individual has difficulty lifting the front part of the foot. This can lead to the person dragging their foot while walking.

See Also

• Muscular system
• Anatomy of the leg
• Foot drop

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