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They discovered that nerves were found in many forms, each with their own potential for excitability. With this research, the pair discovered that the velocity of action potentials was directly proportional to the diameter of the nerve fiber and received a Nobel Prize for their work. [42]
Earthworms have dual nerve cords running along the length of the body and merging at the tail and the mouth. These nerve cords are connected by transverse nerves like the rungs of a ladder. These transverse nerves help coordinate the two sides of the animal. Two ganglia at the head end function similar to a simple brain.
By 1850, Helmholtz was able to measure the signal conductance speed on a frog's sciatic nerve (about 27 m/s at 20-21 °C). [21] [22] Later Golgi and Cajal stained the ramifying branches of nerve cells; these could only touch, or synapse. The brain now had demonstrated form, without localised function.
Nerves that exit from the brain are called cranial nerves while those exiting from the spinal cord are called spinal nerves. The nervous system consists of nervous tissue which, at a cellular level, is defined by the presence of a special type of cell, called the neuron .
Before the evolutionary development of the brain, nerve nets, the simplest form of a nervous system developed. These nerve nets were a sort of precursor for the more evolutionarily advanced brains. They were first observed in Cnidaria and consist of a number of neurons spread apart that allow the organism to respond to physical contact. They ...
A new study on the clitoris found that the organ has 10,000 nerve fibers. (Photo: Getty) (Photo: Getty Images) When it comes to sexual pleasure, there’s one spot on the female anatomy that tends ...
In 1821, Bell published the "On the Nerves: Giving an Account of some Experiments on Their Structure and Functions, Which Lead to a New Arrangement of the System" in Philosophical Transactions of the Royal Society. This paper held Bell's most famous discovery, that the facial nerve or seventh cranial nerve is a nerve of muscular action.
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