tendinous sheath of extensor hallucis longus muscle

tendinous sheath of ex·ten·sor hal·lu·cis lon·gus mus·cle

[TA] the anterior tarsal synovial tendon sheath that surrounds the tendon of the extensor hallucis longus in its passage across the ankle. Synonym(s): vagina tendinis musculi extensoris hallucis longi [TA]