Central Nervous System Snyapses

Central Nervous System Snyapses - Central Nervous System...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Central Nervous System Snyapses Types of synapses Physiological anatomy of the synapse The function of the receptors excitatory and inhibitory receptors Types of Synapses(chemical and electrical) Almost all synapses utilizxed for signal transmission in the CNS of the human being are chemical synapses Allow for one way transmission of signals from the presynaptic neuron to the postsynaptic neuron The first presynaptic neuron secretes a nnuerotransmitter at the syanapse Chemical synapses This transmitter in turn acts on the receptor proteins in the membrane of the next (postsynaptic) neuron The nueortransmitter can Excite the postsynaptic neuron Inhibit the postsynaptic neuron Modify the postsynaptic neuron sensitivity in a selective way Electrical synapse Characterized by direct channels that conduct electricity from on cell to the next Consist of small protein tubular structures called gap junctions that allow free move from the interior of one cell to the next Only a few gap junctions have been identified in the CNS and their significance is not well understood Gap junctions are found in smooth muscle fibers and cardiac muscle cells when they transmit action potentials from one cell to the next Physiological Anatomy of the Synapse A motor neuron in the anterior horn of the spinal cord is composed of three mahor parts Soma (main body of the neuron) Axon ( a single projection from the soma into the peripheral nerve) Dendrites (thin projections of the soma that extend up to 1 mm into the surrounding areas
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Central Nervous System Snyapses - Central Nervous System...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online