Bipn140 Lect 15 Notes Nov10 - BIPN 140 LECT#15 1 DKBerg...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
BIPN 140 LECT #15 1 DKBerg SYNAPSE FORMATION I. Synaptic Structural Complexity - examples A. Vertebrate Neuromuscular Junction (NMJ) Sketch: B. Glutamatergic Spine Synapses in the CNS **FIGURE: EM image of NMJ** **Box 7Bb-e **. II. NMJ Development – original model system A. Morphological Features 1. Initial contacts 2. Multiple synapses 3. Monosynaptic – mediated by competition 4. Maturation: infolding, basal lamina, Schwann cells **FIGURE 23.10** **FIGURE 23.11**. III. Regulation of Postsynaptic nAChRs at the NMJ - Numbers A. Role of Activity 1. Denervation produces increase in extrajunctional nAChRs (like embryonic condition) Sketch: den & fetal muscle: 2. Test: stimulate denervated muscle – retains innervated nAChR distribution. 3. Mechanism: activity reduces extrajunctional nAChR synthesis (turnsover rapidly; lost); stabilizes junctional (turns over slowly;
Image of page 1

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

View Full Document Right Arrow Icon