5 Nervous System

5 Nervous System - The Nervous System I. II. Overview of...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
The Nervous System I. Overview of the nervous system II. Components of the nervous system A. Neurons B. Glial Cells III. Membrane Potentials V. Signaling via membrane potential changes A. Graded potentials B. Action potentials VI. Synapses and Neurotransmitters VII. Postsynaptic Potentials and Integration
Background image of page 1

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

View Full DocumentRight Arrow Icon
Figure 48.3 Overview of information processing by nervous systems Sensor Sensory input Integration Effector Motor output Peripheral nervous system (PNS) Central nervous system (CNS)
Background image of page 2
Basic definitions: • neuron: nerve cell (functional unit of the nervous system) • nerve fiber: axon • nerve: bundles of nerve fibers(axons) + associated blood vessels/connective tissue
Background image of page 3

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

View Full DocumentRight Arrow Icon
Fig. 48.4 - Neuron Structure Dendrites Stimulus Nucleus Cell body Axon hillock Presynaptic cell Axon Synaptic terminals Synapse Postsynaptic cell Neurotransmitter
Background image of page 4
Fig. 48.5 Dendrites Axon Cell body Sensory neuron Interneurons Portion of axon Cell bodies of overlapping neurons 80 µm Motor neuron Structural Diversity of Neurons
Background image of page 5

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

View Full DocumentRight Arrow Icon
Figure 49.6b Astrocytes Glial Cells Figure 48.12 Schwann cells and the myelin sheath (b) Astrocytes (LM) 50 µm xon Schwann cell Myelin sheath Nodes of Ranvier Node of Ranvier Schwann cell Nucleus of Schwann cell Layers of myelin Axon 0.1 µm
Background image of page 6
More Glial Cells Fig. 49.6a Oligodendrocyte Microglial cell Schwann cells Ependy- mal cell Neuron Astrocyte CNS PNS Capillary (a) Glia in vertebrates VENTRICLE
Background image of page 7

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

View Full DocumentRight Arrow Icon
How do neurons communicate? Dendrites Stimulus cleus Cell body Axon hillock Presynaptic cell Axon Synaptic terminals Synapse Postsynaptic cell urotransmitter Between neurons: • Electrical synapses • Chemical synapses Within a neuron: dendrites to cell body (electrical) • cell body to axon terminals (electrical) {
Background image of page 8
electrical difference (∆V) across the plasma membrane anions predominate: proteins, amino acids, sulfate, phosphate, some Cl - , but also some cations such as K + , and some Na + various ions including lots of Na + and Cl - , and some K + • All cells have a “resting” membrane potential • Membrane potentials can be measured using
Background image of page 9

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

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/21/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

Page1 / 29

5 Nervous System - The Nervous System I. II. Overview of...

This preview shows document pages 1 - 10. Sign up to view the full document.

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