Lumbricals of the foot

Lumbricals of the Foot

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Lumbricals of the foot

The Lumbricals of the foot are four small, slender muscles found in the human foot. They are part of the intrinsic muscles of the foot, which are located entirely within the foot and perform fine motor functions. The lumbricals originate from the tendons of the Flexor digitorum longus and are responsible for flexing the metatarsophalangeal joints and extending the interphalangeal joints.

Anatomy

The lumbricals are numbered from medial to lateral, with the first lumbrical being the most medial and the fourth lumbrical being the most lateral. Each lumbrical muscle arises from one of the four tendons of the flexor digitorum longus. They insert into the dorsal aponeurosis of the corresponding digit.

Function

The primary function of the lumbricals is to flex the metatarsophalangeal joints and extend the interphalangeal joints. This action is essential for walking and running, as it allows the foot to push off from the ground with each step.

Clinical Significance

Damage or injury to the lumbricals can result in a loss of fine motor control in the foot, leading to difficulties with walking and balance. Conditions such as Lumbrical plus syndrome and Claw toe can occur as a result of lumbrical dysfunction.

See Also

• Intrinsic muscles of the foot
• Flexor digitorum longus
• Metatarsophalangeal joints
• Interphalangeal joints