The<unk> ,<unk> calcaneus attaches distally to the calcaneual tuberosity, and arises superiorly from the triceps surae complex of the gastrocnemius and soleus muscles.<unk>  at foetus The<unk>  connects muscle to bone, like other<unk> s, and is located at the back of the lower leg. The<unk>  connects the gastrocnemius and soleus muscles to the calcaneal tuberosity on the calcaneus (heel bone). The<unk>  begins near the middle of the calf, and receives muscle fibers on its inner surface, particularly from the soleus muscle, almost to its lower end. Gradually thinning below, it inserts into the middle part of the back of the calcaneus bone. The<unk>  spreads out somewhat at its lower end so that its narrowest part is about above its insertion. The<unk>  is covered by the fascia and skin, and stands out prominently behind the bone; the gap is filled up with areolar and adipose tissue. A bursa lies between the<unk>  and the upper part of the calcaneus. It is about long. Along the side of the muscle, and superficial to it, is the small saphenous vein. The sural nerve accompanies the small saphenous vein as it descends in the posterior leg, traveling inferolateral to it as it crosses the lateral border of the<unk> . The<unk>  is the thickest<unk>  in the human body. It can receive a load stress 3.9 times body weight during walking and 7.7 times body weight when running. The blood supply to the<unk>  is poor, and mostly via a recurrent branch of the posterior tibial artery, and some through arterial branches passing through surrounding muscles.
Achilles tendon
Deltoid muscle
Nerve fascicle
Mesna
Axon hillock
Pivot joint
Pectus
Ulnar claw