Each nerve ending has a “threshold” for stimulation – at a certain point (of vibration, pressure, heat, etc) the nerve will fire, creating an electrical impulse that travels up the nerve axon. When it reaches the end of the nerve fiber, a chemical reaction “jumps” across the space ...
dendrites, cell body, axon hillock, initial segment, axon, axon terminals, synaptic knobs, myeline sheath dendrites branchlike parts of a neuron that receive information cell body largest part of a neuron contains the nucleus and cytoplasm axon hillock Cone shaped region of an axon where it join...
Project another axon that transmits signals to the brain after crossing the cribriform plate Express olfactory receptors : Constitute one of the largest families of G-protein–coupled receptors Controlled by as many as 800 genes in humans Diagram depicting the 1st structures of the olfactory syste...
Axon A threadlike extension of a neuron that carries nerve impulses away from the cell body. axon hillock Cone shaped region of an axon where it joins the cell body. terminal branches Branched endings of an axon that transmit messages to other neurons10,000 or more axon terminal The endpoint...
in diameter, which bears numerous dendrites; none of these extends to the optic lobe. An axon leaves the integrating segment, crosses the brain, thickens to about 17µm and descends the contralateral nerve cord.3. The descending axon terminates in the metathoracic ganglion, where it has ...
This chapter aims to recapitulate the anatomy of the cranial nerves. It briefly introduces and discusses alternative systematics but pragmatically uses traditional terminology. However, in contrast to classical textbooks and scientific articles, it describes nerves following the direction of action potential...
The axon collaterals of the CA3 pyramidal cells that project to CA1. Auto-associative network A network of neurons with axon collaterals that terminate on dendrites of the parent cell. Place cells Principal neurons in the hippocampus and parahippocampus that fire whenever an animal is in a specif...
The septum secundum is an infolding of the atrial wall. The actual atrial wall is the flap valve of the foramen ovale. 11. In the fetus, this ridge directs the blood from the IVC to the LA through the foramen ovale. In the adult, it occasionally persists. 12. Higher thickness values...
astrocytes of the PNS schwann oligodendrocytes of the PNS -schwann=one segment of an axon the role of myelin -fatty, protein-lipid -only associated with axons (but not all) -functions: 1. insulation (protection) 2. increase speed of electrical impluse ...
base of axon, where action potentials (APs) are generated Terminal Branches branches near the end of an axon Terminal synaptic knob, distal foot-like end of axon Axonal transport the way structures get from soma to the terminal and back ...