Rosemary. A sprig of rosemary. PAIU2004/137/01. Since ancient times this aromatic herb has been believed to have properties to improve the memory. Perhaps because of this, rosemary became an emblem of both fidelity and remembrance in literature and folklore.AIU2004/137/01. Since ancient times this aromatic herb has been believed to have properties to improve the memory. Perhaps because of this, rosemary became an emblem of both fidelity and remembrance in literature and folklore.
The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body. The nervous system detects environmental changes that impact the body, then works in tandem with the endocrine system to respond to such events.
However, even sponges, unicellular animals, and non-animals such as slime molds have cell-to-cell signalling mechanisms that are precursors to those of neurons. In radially symmetric animals such as the jellyfish and hydra, the nervous system consists of a nerve net, a diffuse network of isolated cells.t the cellular level, the nervous system is defined by the presence of a special type of cell, called the neuron, also known as a nerve cell. Neurons have special structures that allow them to send signals rapidly and precisely to other cells.