Final answer:
The Achilles tendon connects the muscles in the lower leg to the heel bone. The deep fascia, called plantar aponeurosis, works to support the foot's arch and contribute to movements of the toes.
Step-by-step explanation:
The muscles in the lower leg are connected to the heel bone, or calcaneus, by the tendon known as the Achilles tendon. The Achilles tendon attaches the gastrocnemius, soleus, and plantaris muscles to the calcaneus bone of the ankle. It is a strong and important tendon responsible for plantar flexion of the foot.
The deep fascia of the leg, known as the plantar aponeurosis, works to support the foot's arch and contributes to movements of the toes. It runs from the calcaneus bone to the toes and helps maintain the longitudinal arch of the foot. Inflammation of this tissue can result in a condition called plantar fasciitis, commonly affecting runners.