â¢ The cell cycle is a series of events that takes. place from one cell division to the next. â¢ The time is takes to complete a cell cycle is. not the same in all cells.
A neuron is a nerve cell. The brain is made up of approximately 100 billion neurons. Neurons are similar to other cells in the body in some ways such as: Neurons are surrounded by a membrane. Neurons have a nucleus that contains genes. Neurons contain cytoplasm, mitochondria and other organelles.
in the brain the neurons are there at birth as well as some synapses as the neurons mature more and more synapses are made at birth the number of synapses per neuron is 2500 but by age two or three it s about 15000 per neuron the brain eliminates connections that are seldom or never used which is a normal part of brain development