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The following are two lists of animals ordered by the size of their nervous system.The first list shows number of neurons in their entire nervous system. The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence. [1]
[2] [3] This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the level of L3 or L4 in the spinal cord, completely independent of higher centres. [4] From there, an alpha motor neuron conducts an efferent impulse back to the quadriceps femoris muscle , triggering contraction. [ 3 ]
Animal neurophysiology (1 P) B. Brain–computer interface (1 C, 44 P) N. ... Pages in category "Neurophysiology" The following 199 pages are in this category, out of ...
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. [9] In radially symmetric animals such as the jellyfish and hydra, the nervous system consists of a nerve net , a diffuse network of isolated cells. [ 10 ]
Pages in category "Animal neurophysiology" This category contains only the following page. This list may not reflect recent changes. A.
Charles Darwin wrote of the interaction between size and complexity of invertebrate brains: . It is certain that there may be extraordinary activity with an extremely small absolute mass of nervous matter; thus the wonderfully diversified instincts, mental powers, and affections of ants are notorious, yet their cerebral ganglia are not so large as the quarter of a small pin's head.
In rats (the animals that have been the most extensively studied), theta is seen mainly in two conditions: first, when an animal is walking or in some other way actively interacting with its surroundings; second, during REM sleep. [111] The function of theta has not yet been convincingly explained although numerous theories have been proposed ...
The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.It consists of nervous tissue and is typically located in the head (cephalization), usually near organs for special senses such as vision, hearing and olfaction.