12.01.15 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.

Fig. 49-1

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)

Pallium Cerebrum Cerebral cortex Cerebrum Cerebellum Cerebellum Fig. 49-14 Pallium Cerebrum Cerebral cortex Cerebrum Cerebellum Cerebellum Thalamus Thalamus stopped here. Midbrain Midbrain Hindbrain Hindbrain Avian brain to scale Avian brain Human brain

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

PNS Efferent neurons Afferent (sensory) neurons Motor system Autonomic Fig. 49-7-2 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

Patellar Reflex — Knee jerk Fig. 49-3 Patellar Reflex — Knee jerk Figure 49.3 The knee-jerk reflex Sensory neuron Motor neuron Interneuron

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

Frontal lobe Parietal lobe Motor cortex Somatosensory association Fig. 49-15 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 49.15 The human cerebral cortex Vision Temporal lobe Occipital lobe

Shoulder Elbow Trunk Knee Forearm Hip Wrist Hand Fingers Thumb Neck Fig. 49-16a Shoulder Elbow Trunk Knee Forearm Hip Wrist Hand Fingers Thumb Neck Brow Eye Toes Face Lips Figure 49.16 Body part representation in the primary motor and primary somatosensory cortices Jaw Tongue Primary motor cortex

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.

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