Innervation.—The superficial peroneal branch of the peroneal nerve sends a twig into the proximal part of the muscle.
Individual Variation.—None of significance in any of the three species studied.
M. Lumbricalis, [Fig. 19]F
T. pallidicinctus
General Description and Relations.—Small, thin, and strap-shaped; on mid-posterior surface of distal end of tarsometatarsus deep to tendon of M. flexor digitorum longus; belly partly fleshy and partly elastic connective tissue.
Origin.—The muscle arises from the deep (anterior) surface of the tendon of M. flexor digitorum longus a short distance proximal to the trifurcation of the latter.
Insertion.—The muscle attaches to the proximal end of the subarticular cartilage ventral to the trochlea for digit III.
Innervation.—A long but extremely small twig arises from the paraperoneal branch of the tibial nerve a short distance distal to the hypotarsus and extends distally along the mid-posterior surface of the tarsometatarsus (parallel to a larger nonmuscular branch) and enters the deep surface distal to the middle. It was possible to follow this twig in only two legs; it was presumably destroyed in the course of dissection in the others.
Individual Variation.—In some cases, the "muscle" appears grossly to be entirely connective tissue, although a distinct entity.
T. cupido