BIOS Instant Notes in Neuroscience (2nd Edition) by Alan Longstaff

By Alan Longstaff

The second one version of Instant Notes in Neuroscience covers neuroanatomy, mobile and molecular neuroscience, structures neuroscience, habit, improvement of the worried method, studying, reminiscence, and customary mind issues. It supplies quick and straightforward entry to the center of the topic in a reasonable and manageable-sized textual content.

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The resting membrane potential is −70 mV. Action potential properties Action potentials have a number of important properties: 1. Under physiological conditions action potentials are triggered at the axon hillock (initial segment) and are propagated along the axon toward its terminals. 2. They are threshold phenomena. A minimum-size stimulus current is required to produce an action potential. This is the threshold stimulus, and is defined as the current that will cause a neuron to fire on 50% of the occasions it is used.

In the subarachnoid space that lies between them run superficial cerebral blood vessels. These are invested by a leptomeningeal coat and suspended in the space A7 – Meninges and cerebrospinal fluid 27 Cranial bone Extradural space Venous sinus Arachnoid villus Dura mater Subdural space Arachnoid mater Subarachnoid space Cerebral blood vessel Subpial space Pia mater Cistern Sulcus Brain Perivascular (Virchow–Robin) space Fig. 1. The meninges. by trabeculae. The subarachnoid space is filled with cerebrospinal fluid.

These channels are transmembrane glycoproteins with a molecular structure related to that of voltage-dependent sodium channels. Like them, they are opened by depolarization. This allows potassium ions to flow down their concentration gradient out of the cell. The inside of the neuron becomes less positive, that is, it repolarizes. This accounts for the downstroke of the spike of the action potential. At the bottom of the downstroke most of the VDSCs are inactivated so there is no flow of sodium into the cell.

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