Aluminium versus aluminum. Following up a Topical Words piece on the international spelling of what British English writes as sulphur, many American subscribers wrote in to ask about another element with two spellings: aluminium.
The simplest and presumably most primitive form of nervous system is termed a nerve net. In a nerve net, neurons are dispersed in a thin layer, not clustered into nerves or a central nervous system (CNS), and they are positioned seemingly at random relative to each other.he simplest and presumably most primitive form of nervous system is termed a nerve net. In a nerve net, neurons are dispersed in a thin layer, not clustered into nerves or a central nervous system (CNS), and they are positioned seemingly at random relative to each other.
The autonomic nervous system (ANS) is a system of motor neurons that innervate smooth muscle, cardiac muscle and glands. The autonomic nervous system has two divisions: Sympathetic and Parasympathetic.They mostly innervate the same structures but cause opposite effects. The sympathetic division mobilizes the body during extreme situations such as exercise, excitement and emergencies.he âdorsal root gangliaâ is in the sensory somatic part of the peripheral nervous system and are sensory ganglia made up of cell bodies of sensory neurons.