Tundra. The tundra is a treeless polar desert found in the high latitudes in the polar regions, primarily in Alaska, Canada, Russia, Greenland, Iceland, and Scandinavia, as well as sub-Antarctic islands.
The muscles acting on the foot can be divided into two distinct groups; extrinsic and intrinsic muscles. 1  The extrinsic muscles arise from the anterior, posterior and lateral compartments of the leg.2  They are mainly responsible for actions such as eversion, inversion, plantarflexion and dorsiflexion of the foot. The extrinsic muscles arise from the anterior, posterior and lateral compartments of the leg. 2  They are mainly responsible for actions such as eversion, inversion, plantarflexion and dorsiflexion of the foot.
Skeletal muscles. Skeletal muscles move the external parts of the body and the limbs. Skeletal muscles cover the bones and give our bodies their shape. For every skeletal muscle in the human body there is an identical one on the other side. There are about 320 pairs of identical bilateral muscles. When one muscle contracts, the other expands, and this allows movement.