Dissectible Me 5 minute anatomy

Quadriceps femoris and the hamstrings are powerful extensors and flexors of the knee respectively, but they also cross the hip joint. Let's talk about their anatomy. 

The pelvic floor (or pelvic diaphragm) describes the structures at the lowest point of the pelvis, largely muscles, that support the pelvic organs directly and everything else inside the torso. Let's explain concisely the important anatomy here.

The flexor tendons of the fingers run into synovial tunnels that let them move freely as we strengthen and relax our grip. These tunnels are tied down to the bone by some extraordinarily strong annular and cruciform pulleys that keep the tendons close to the bone. Let's describe their anatomy and their naming. 

There are 3 arches in the foot: a medial longitudinal arch, a lateral longitudinal arch and a transverse arch. Why do humans have arches in their feet? What's the anatomy here? 

The plantar aponeurosis (or plantar fascia) is a very strong connective structure on the sole of the foot, deep to the skin, running from the heel bone to the toes. It protects the structures in the plantar foot, supports the longitudinal arches and returns stored energy during the gait cycle to improve the efficiency of walking and running. It can be injured leading to pain anterior to the calcaneus on the plantar foot and a condition called plantar fasciitis.