1. a. A mineral crystallizing in another mineral in the form of a branching or treelike mark. b. A rock or mineral bearing such a mark or marks.
2. A branched protoplasmic extension of a nerve cell that conducts impulses from adjacent cells inward toward the cell body. A single nerve may possess many dendrites. In this sense, also called dendron.
This is a model of a typical brain cell, or neuron. Your brain contains billions of brain cells. A brain cell consists of a cell body, which stores the DNA, dendrites which receive chemical signals from other cells, and an axon, which carries an electrical signal from the cell body to the axon terminals. The axon terminals contain chemicals, called "neurotransmitters," which are released in order for the cell to communicate with nearby cells.
is a neurotransmitter, and some brain cells have axons that contain only
serotonin. These are called "serotonin neurons." Other brain cells produce
and release different neurotransmitters, like dopamine or norepinephrine,
and some produce and release more than one neurotransmitter. However, your
serotonin cells only produce and release serotonin.