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Bild2Lec2 - BILD 2: Multicellular Life LECTURE #2 [Website:

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Unformatted text preview: BILD 2: Multicellular Life LECTURE #2 [Website: http://www.biology.ucsd.edu/classes/bild2.WI08.2] Instructor: Darwin K. Berg dberg@ucsd.edu Figure 48.5 Structure of a vertebrate neuron Dendrites Cell body Nucleus Axon hillock Axon Signal direction Synapse Myelin sheath Synaptic terminals Presynaptic cell Figure 48.5 Structure of a vertebrate neuron Dendrites Cell body Nucleus Axon hillock Axon Signal direction Synapse Myelin sheath Synaptic terminals Presynaptic cell Postsynaptic cell Figure 48.6 Structural diversity of vertebrate neurons Axon Cell body Dendrites (a) Sensory neuron (b) Interneurons (c) Motor neuron Figure 48.20 Ventricles, gray matter, and white matter Gray matter White matter Ventricles Figure 48.4 The knee-jerk reflex Sensory neurons from the quadriceps also communicate with interneurons in the spinal cord. The interneurons inhibit motor neurons that supply the hamstring (flexor) muscle. This inhibition prevents the hamstring from contracting, which would resist the action of the quadriceps. The sensory neurons communicate with motor neurons that supply the quadriceps. The motor neurons convey signals to the quadriceps, causing it to contract and jerking the lower leg forward. 4 5 6 The reflex is initiated by tapping the tendon connected to the quadriceps (extensor) muscle....
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Bild2Lec2 - BILD 2: Multicellular Life LECTURE #2 [Website:

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