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Catalyst Think! Name as many parts of the nervous system as you can. Which is the most important? I will describe the role of the nervous system and investigate my sensory neurons.
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Fig. 49-1
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Figure 49.2 Nervous system organization
Eyespot Brain Brain Radial nerve Nerve cords Nerve ring Ventral nerve cord Transverse nerve Nerve net Segmental ganglia (a) Hydra (cnidarian) (b) Sea star (echinoderm) (c) Planarian (flatworm) (d) Leech (annelid) Brain Brain Ganglia Ventral nerve cord Anterior nerve ring Brain Spinal cord (dorsal nerve cord) Sensory ganglia Longitudinal nerve cords Figure 49.2 Nervous system organization Ganglia Segmental ganglia (e) Insect (arthropod) (f) Chiton (mollusc) (g) Squid (mollusc) (h) Salamander (vertebrate)
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Pallium Cerebrum Cerebral cortex Cerebrum Cerebellum Cerebellum
Fig Pallium Cerebrum Cerebral cortex Cerebrum Cerebellum Cerebellum Thalamus Thalamus stopped here. Midbrain Midbrain Hindbrain Hindbrain Avian brain to scale Avian brain Human brain
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Central nervous system (CNS) Peripheral nervous system (PNS) Brain
Fig. 49-4 Central nervous system (CNS) Peripheral nervous system (PNS) Brain Cranial nerves Spinal cord Ganglia outside CNS Spinal nerves Figure 49.4 The vertebrate nervous system
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PNS Efferent neurons Afferent (sensory) neurons Motor system Autonomic
Fig PNS Efferent neurons Afferent (sensory) neurons Motor system Autonomic nervous system Hearing Sympathetic division Parasympathetic division Enteric division Locomotion Figure 49.7 Functional hierarchy of the vertebrate peripheral nervous system Hormone action Gas exchange Circulation Digestion
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Patellar Reflex — Knee jerk
Fig. 49-3 Patellar Reflex — Knee jerk Figure 49.3 The knee-jerk reflex Sensory neuron Motor neuron Interneuron
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Patellar Reflex — Knee jerk
Fig. 49-3 Patellar Reflex — Knee jerk Cell body of sensory neuron Figure 49.3 The knee-jerk reflex Spinal cord (cross section) Sensory neuron Motor neuron Interneuron
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Frontal lobe Parietal lobe Motor cortex Somatosensory association
Fig Frontal lobe Parietal lobe Motor cortex Somatosensory cortex Somatosensory association area Speech Frontal association area Taste Reading Speech Hearing Visual association area Smell Auditory association area Figure The human cerebral cortex Vision Temporal lobe Occipital lobe
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Shoulder Elbow Trunk Knee Forearm Hip Wrist Hand Fingers Thumb Neck
Fig a Shoulder Elbow Trunk Knee Forearm Hip Wrist Hand Fingers Thumb Neck Brow Eye Toes Face Lips Figure Body part representation in the primary motor and primary somatosensory cortices Jaw Tongue Primary motor cortex
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Investigation: What’s your level of perception?
Read through the big idea on your notes page. How will we combat bias in this lab? Locations Tested: back of neck, back of hand, fingertip, forearm (inside & outside), lips or cheeks.
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Groups of 3 — Tables 1. Complete the question, hypothesis and variables 2. Send one person (with your answers) up to retrieve your materials. - 1 piece of paper, scissors, 8 toothpicks
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