Word Origin and History for philo- Expand. before vowels phil-, word-forming element meaning loving, fond of, tending to, from Greek philo-, comb. form of philos dear (adj.), friend (n.), from philein to love, of unknown origin. Productive of a great many compounds in ancient Greek.
One way to classify neurons is by the number of extensions that extend from the neuron's cell body (soma). Bipolar neurons have two processes extending from the cell body (examples: retinal cells, olfactory epithelium cells).
The olfactory binding protein carries odorant molecules to the cilia of the olfactory sensory neurons. A receptor-odorant complex is formed, which activates a G protein. Second-messenger systems are activated, Na+ (sodium) and Ca2+ (calcium) or Ca2+ channels are opened, and the cilia are depolarized.t is the first region of the central nervous system where sensory signals from olfactory sensory neurons are processed. As noted earlier, the axons of the olfactory sensory neurons travel in olfactory nerves and spread over the surface of the ipsilateral olfactory bulb, forming an olfactory nerve layer (Fig.