Lower limb

Synovial Sheaths of the Toes

Vaginae synoviales digitorum pedis

Origin

At the level of the metatarsophalangeal joints, where the sheaths surround the long toe flexor tendons

Insertion

Continuing to the attachment of the flexor tendons on the distal phalanges

Function

Reduce friction and hold the long toe flexor tendons (flexor digitorum longus and flexor hallucis longus) against the bone during gliding

Innervation

No motor innervation of its own; sensation of the surrounding tissues via the plantar nerves

Movement & chain

Move passively with tendon gliding during flexion/extension of the toes; no contractile function of their own.

Palpation

Palpable along the plantar aspects of digits II–V during active motion; normally smooth and non-tender.

Clinical

Flexor tenosynovitis of the toes, trigger toe stenosing tenosynovitis, and infectious closed-space tenosynovitis following puncture trauma.

Segmental innervation

None (no muscle tissue); sensory supply via the medial and lateral plantar nerves, S1-S3.

In clinical practice

Diabetic foot inspection and pressure ulcer prevention; monitor for friction points from footwear or bedding and ensure correct anti-embolism stocking fit.

Region in the model

Lower limb