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.
Neuroscience and Behavior Parts of the Brain and their Functions. Hindbrain. an area of the brain that coordinates information coming into and out of the spinal cord. the 3 anatomical structures that make up the hindbrain are the medulla, cerebellum, and pons. Medulla. an extension of the spinal cord into the skull that coordinates heart rate circulation and respiration. Reticular Formation.