A neuromuscular junction (sometimes called a myoneural junction) is a junction between nerve and muscle; it is a chemical synapse formed by the contact between the presynaptic terminal of a motor neuron and the postsynaptic membrane of a muscle fiber.he binding of ACh to the receptor can depolarize the muscle fiber, causing a cascade that eventually results in muscle contraction. Neuromuscular junction diseases can be of genetic and autoimmune origin.
Definition of:Micro USB. The very small USB port found on cellphones and other portable devices is a Micro-B socket. Considerably smaller than the USB Type B sockets on printers and scanners, the Micro-B socket is half the thickness of the Mini-B socket found on digital cameras. Micro-A plugs and Micro-AB sockets are the standard connectors for USB On-The-Go (see USB OTG). See USB 3.0 and USB.
USB Type B connectors, officially referred to as Standard-B connectors, are square in shape with either a slight rounding or large square protrusion on the top, depending on the USB version. USB Type-B connectors are supported in every USB version, including USB 3.0, USB 2.0, and USB 1.1.A second type of B connector, called Powered-B, also exists but only in USB 3.0. USB 3.0 Type B connectors are often the color blue while USB 2.0 Type B and USB 1.1 Type B connectors are often black.However, this is not always the case.SB Type B Compatibility. The USB Type B connectors in USB 2.0 and USB 1.1 are identical, meaning that the USB Type B plug from one USB version will fit into the USB Type B receptacle from its own, and from the other, USB version.