What is the function of the Lumbricals of the foot?

What is the function of the Lumbricals of the foot?

Function. By pulling the medial base of the proximal phalanx, the lumbrical muscles flex and adduct the toes at the metatarsophalangeal (MTP) joints. Conversely, by pulling the extensor expansions of the phalanges, the lumbricals extend the toes at the interphalangeal (IP) joints.

What are lumbrical muscles of foot?

The lumbrical muscles of the foot are four muscles that originate from the tendons of the flexor digitorum longus and pass dorsally to insert into the free medial margins of the extensor hoods of the four lateral toes.

What Innervates the lateral two lumbricals?

The first and second lumbricals (the most radial two) are innervated by the median nerve. The third and fourth lumbricals (most ulnar two) are innervated by the ulnar nerve.

What is the action of the lumbrical muscles?

The lumbrical muscles are unique in having their origin and insertion on tendons. The lumbricals assist in metacarpophalangeal joint flexion; they contribute to interphalangeal joint extension by acting as deflexors of the proximal interphalangeal joint.

What are the lumbricals innervated by?

median nerve
It has long been recognized that the first and second lumbricals are normally innervated by the median nerve, whereas the third and fourth lumbricals are innervated by the ulnar nerve (Sunderland and Ray, 1946).

What Innervates the palmar Interossei?

The palmar interossei receive nerve supply from the deep branch of the ulnar nerve. The deep branch of the ulnar nerve arises from nerve roots of C8 and T1 with T1 being the primary innervating segment.

What are the lateral lumbricals?

The first two, lateral lumbricals are unipennate muscles. The first lumbrical originates on the lateral side of the first tendon of the flexor digitorum profundus and inserts into the extensor hood of the second digit.

Are all lumbricals Unipennate?

The lumbrical muscles of the hand are numbered 1-4 from the most radial/lateral to the most ulnar/medial. Lumbricals 1-2 are usually unipennate, meaning their fibers arise obliquely from one tendon, while lumbricals 3-4 are bipennate, arising from two adjacent tendons.

What are the Lumbricals innervated by?

What are the lumbrical muscles of the foot?

The lumbrical muscles of the foot are part of the central muscles of the sole of the foot. The central muscles of the sole of the foot include the lumbricals, flexor digitorum brevis, quadratus plantae, plantar and dorsal interossei muscles.

What nerve innervates the lumbrical muscles?

The lumbrical muscles originate at the tendons of the flexor digitorum longus muscle and have their insertion on the proximal phalanges of the second to fifth toes and the dorsal aponeurosis. The lumbricals are innervated by the medial and lateral plantar nerves, both branches of the tibial nerve.

What are the muscles of the sole of the foot?

The central muscles of the sole of the foot include the lumbricals, flexor digitorum brevis, quadratus plantae, plantar and dorsal interossei muscles. The lumbrical muscles originate at the tendons of the flexor digitorum longus muscle and have their insertion on the proximal phalanges of the second to fifth toes and the dorsal aponeurosis.

Where are the intrinsic muscles of the foot located?

The intrinsic muscles are located within the foot and are responsible for the fine motor actions of the foot, for example movement of individual digits. In this article we shall be considering the anatomy of the intrinsic muscles of the foot. They can be divided into those situated on the dorsum of the foot,…