Search results
Results from the WOW.Com Content Network
In many mammals, early embryo cells exchange signals with cells of the uterus. [21] In the human gastrointestinal tract, bacteria exchange signals with each other and with human epithelial and immune system cells. [22] For the yeast Saccharomyces cerevisiae during mating, some cells send a peptide signal (mating factor pheromones) into
Each gap junction (sometimes called a nexus) contains numerous gap junction channels that cross the plasma membranes of both cells. [11] With a lumen diameter of about 1.2 to 2.0 nm, [2] [12] the pore of a gap junction channel is wide enough to allow ions and even medium-size molecules like signaling molecules to flow from one cell to the next, [2] [13] thereby connecting the two cells' cytoplasm.
A mirror neuron is a neuron that fires both when an animal acts and when the animal observes the same action performed by another. [1] [2] [3] Thus, the neuron "mirrors" the behavior of the other, as though the observer were itself acting.
Most neurons receive signals via the dendrites and soma and send out signals down the axon. At the majority of synapses, signals cross from the axon of one neuron to the dendrite of another. However, synapses can connect an axon to another axon or a dendrite to another dendrite. The signaling process is partly electrical and partly chemical.
The distinctive structure of nerve cells allows action potentials to travel directionally (from dendrites to cell body down the axon), and for these signals to then be received and carried on by post-synaptic neurons or received by effector cells. Nerve cells have long been used as models for cellular polarization, and of particular interest ...
One group of researchers (Iturria-Medina et al., 2008) [35] has constructed connectome data sets using diffusion tensor imaging (DTI) [36] [37] followed by the derivation of average connection probabilities between 70 and 90 cortical and basal brain gray matter areas. All networks were found to have small-world attributes and "broad-scale ...
Connectomics is the production and study of connectomes: comprehensive maps of connections within an organism's nervous system.More generally, it can be thought of as the study of neuronal wiring diagrams with a focus on how structural connectivity, individual synapses, cellular morphology, and cellular ultrastructure contribute to the make up of a network.
The development of the nervous system in humans, or neural development, or neurodevelopment involves the studies of embryology, developmental biology, and neuroscience.These describe the cellular and molecular mechanisms by which the complex nervous system forms in humans, develops during prenatal development, and continues to develop postnatally.