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The median nerve

The median nerve is a sensory and motor nerve of the arm (or upper limb). The median nerve is derived from the medial and lateral cords of the brachial plexus. It contains fibres from roots C6-T1 and ...

Published: Nov 20 2023

The radial nerve

The radial nerve is the terminal continuation of the posterior cord of the brachial plexus. It therefore contains fibres from nerve roots C5 – T1. The radial nerve helps you move your elbow, wrist,...

Published: Nov 20 2023

Depletion of the ozone layer

Planet Earth has its own natural sunscreen that shields us from the sun's damaging ultraviolet radiation. It's called the ozone layer: a fragile band of gases beginning 15 kilometres above our planet,...

Published: Nov 20 2023

The cerebellum is the largest part of the hindbrain and second largest part of the brain as a whole. It weighs about 150 g. It is located in the posterior cranial fossa underneath the tentorium cerebe...

Published: Nov 20 2023

Temperate forests

Temperate forests represent one of the major biomes on Earth, covering 14% of Earth's terrestrial land surface. Along with boreal and subtropical/tropical wet and dry forests, temperate forests are on...

Published: Nov 20 2023

Boreal forests, found farthest north, experience long, cold winters with short growing seasons. Temperate forests, located in the mid-latitudes, have four distinct seasons. Tropical forests, found alo...

Published: Nov 6 2023

Choanal atresia

Choanal atresia has an incidence of 1 in 5000 to 1 in 8000 live births. Fifty percent of all patients with choanal atresia and up to 75% of patients with bilateral disease have other associated congen...

Published: Nov 6 2023

Over time, cultures around the world have had different names and numbers of constellations depending on what people thought they saw. Since the dawn of recorded civilization, stars played a key role...

Published: Nov 6 2023

A circular fluid motion that rotates in as closed area in the same direction as the earth is called a cyclone. A cyclone is an inward spiraling wind that rotates clockwise in the southern hemisphere a...

Published: Nov 6 2023

Altitude illness

Altitude illness occurs when a person ascends more rapidly than the body can adjust (acclimatize) to the decreased oxygen at a higher altitude. Some people adjust very easily, while others cannot go a...

Published: Nov 6 2023

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