Groove for tendon of flexor hallucis longus - Sulcus tendinis musculi flexoris hallucis longi
The posterior surface of the talus is narrow, and traversed by a groove (Groove for tendon of flexor hallucis longus) running obliquely downward and medialward, and transmitting the tendon of the Flexor hallucis longus. Lateral to the groove is a prominent tubercle, the posterior process, to which the posterior talofibular ligament is attached; this process is sometimes separated from the rest of the talus, and is then known as the os trigonum. Medial to the groove is a second smaller tubercle.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
General Anatomy > Bones; Skeletal system > Appendicular skeleton > Bones of lower limb > Free part of lower limb > Bones of foot > Tarsal bones > Talus > Body of talus > Posterior process > Groove for tendon of flexor hallucis longus