Junctions & Synapses Lec 5.

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Presentation transcript:

Junctions & Synapses Lec 5

Types of Synapses 1. Chemical synapse 2. Electrical synapse (Gap junction)

Chemical synapse

Electrical synapse

Synaptic Transmission at the NMJ

Fig. 12.14

Fig. 12.T03

Neuromuscular junction(NMJ) At NMJ for Acetylcholine to be released we need; 1. AP arrives to nerve terminal 2. Ca+2 influx to nerve terminal

Substances working on the NMJ 1. Prevent Acetylcholine (Ach) release at the NMJ: “Botulinum toxin” 2. Competitive antagonist on Ach receptors: Tubocurarine (muscle relaxant in surgery) 3. Anti-cholinesterase drugs: Diiso propyl flurophosphate (nerve gas) Neostigmine (treatment of Myasthenia gravis) (Terminate curare effect )