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A hillock or knoll is a small hill, [1] usually separated from a larger group of hills such as a range. Hillocks are similar in their distribution and size to small mesas or buttes . This particular formation occurs often in Great Britain and China .
The axon hillock is a specialized part of the cell body (or soma) of a neuron that connects to the axon. It can be identified using light microscopy from its appearance and location in a neuron and from its sparse distribution of Nissl substance .
As an action potential (nerve impulse) travels down an axon there is a change in electric polarity across the membrane of the axon. In response to a signal from another neuron, sodium- (Na +) and potassium- (K +)–gated ion channels open and close as the membrane reaches its threshold potential. Na + channels open at the beginning of the ...
The axon hillock is the area formed from the cell body of the neuron as it extends to become the axon. It precedes the initial segment. The received action potentials that are summed in the neuron are transmitted to the axon hillock for the generation of an action potential from the initial segment.
The surge of depolarization traveling from the axon hillock to the axon terminal is known as an action potential. Action potentials reach the axon terminal, where the action potential triggers the release of neurotransmitters from the neuron. The neurotransmitters that are released from the axon continue on to stimulate other cells such as ...
Mount (heraldry) In heraldry, a mount (also mountain, hill, hillock) is a representation of a hill or mountain as a curved terrace in base. [1] When the mount is included in the lower part of the shield, it may be considered an ordinary rather than a charge. A trimount, also described as a mount mounted, or shapournet shapourned, is a ...
Auricle (anatomy) The auricula. Lateral surface. The auricle or auricula is the visible part of the ear that is outside the head. It is also called the pinna (Latin for ' wing ' or ' fin ', pl.: pinnae), a term that is used more in zoology.
A dendrite (from Greek δένδρον déndron, "tree") or dendron is a branched protoplasmic extension of a nerve cell that propagates the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.