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.
The hindbrain, or rhombencephalon, consists of the medulla oblongata, the pons, and the cerebellum. Medulla oblongata (fig. 43-1). The rostral part of the spinal cord expands, passes through the foramen magnum, and becomes the medulla oblongata. The medulla rests anteriorly on the basilar part of the occipital bone. Posteriorly, the medulla is largely covered by the cerebellum (see fig. 43-3). The caudal half of the medulla contains the continuation of the central canal of the spinal cord, which, in the rostral half of the medulla, widens to become the fourth ventricle.