Individual Variation.—In some cases, the "muscle" appears grossly to be entirely connective tissue. The innervation was found in only one leg, in which the twig arises more distally than in T. pallidicinctus.
P. p. jamesi
The innervation was not found.
M. Abductor Digiti IV, [Fig. 19]F
T. pallidicinctus
General Description and Relations.—Slender and elongate; on posterior surface of tarsometatarsus lateral to midline; in contact with M. flexor hallucis brevis in midline.
Origin.—The origin is fleshy from the posterior surface of the tarsometatarsus lateral to the midline beginning near the proximal end (lateral to the hypotarsus) and ending at the level of the first metatarsal.
Insertion.—The slender tendon, which begins along the lateral edge of the distal part of the belly, passes through a retinaculum on the posterolateral surface of the tarsometatarsus immediately above the outer trochlea and attaches to the lateral surface of the proximal end of the first phalanx of digit IV.
Innervation.—The paraperoneal branch of the tibial nerve gives one or two twigs to the proximal part of the muscle.