1 Hydrogen is the most abundant element in the universe. 2  Hydrogen isn't common in a pure form on Earth, but is mostly found as part of water. 3  Hydrogen is the main fuel of stars and the only fuel for red dwarfs. 4  The whole universe is thought to have been formed by a Hydrogen nucleus.
Noun. 1. hindlimb-a posterior appendage such as a leg or the homologous structure in other animals. hind limb. hind leg-the back limb of a quadruped. limb-one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper. 1  Facebook.
Hindbrain is the most posterior and inferior part of brain that connects to the spinal cord.It consists of three parts: Pons, Medulla oblongata and Cerebellum. The cavity of the hindbrain forms the fourth ventricle.edulla oblongata: It is the inferior-most component of brain that is continuous below with the spinal cord. Structurally, it is conical in shape and contains a median fissure on the anterior surface, on either side of which is a swelling called the pyramid.