BIOL 306 Lecture Notes - Lecture 19: Pylorus, Motor Neuron, Eve Marder
10 Jan 2019
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Document Summary
Controls the stomach movements of crustaceans: lobsters, crabs, crayfish, shrimp. 3 main sections: cardiac sac: churns food, gastric mill: 3 teeth cut and grind ingested food, pylorus mixes particles. The gastric mill and pylorus are rhythmically active, and controlled by the stomatogastric ganglion (stg) Small nervous system that is useful for studying rhythmic patterns. Many general principles of the circuit behaviours and cpgs have been discovered in the stgs. System is well characterized, as we"ve been studying them for over 40 years. The two main motor patterns of the stg. Gastric mill: fast and well characterized rhythm with a period of around 1s, a less stereotyped rhythmic movements. We can see that injecting current in. Likewise, injecting a current in lp causes a hyperpolarization of pd. This is an indication that they are parts of a half-centre oscillation network: if you washed in a blocker of inhibitory synapses you"ll initially see a lot of firing due to inhibition rebound.
