Chap 41 notes

Chap 41 notes - Neural Regulation Cnidarians have nerve...

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Neural Regulation Cnidarians have nerve nets (interconnected neurons) Echinoderms have radial nervous systems (selective org. of neurons) Bilateral nervous system, cerebral ganglia, “ladder type” Annelids and Arthropods Ventral nerve cord, ganglia linked to nucleus, cerebral ganglia continues to move Arthropods specialized for integrating info from sense organs Well-developed nervous systems, sense organs, active lifestyle Lobes and intricate folds similar to vertebrates CNS (brain continuous with spinal cord) PNS (sensory receptors) Divided into somatic and autonomic Changes in external environment: somatic Regulate internal environment: autonomic Evolution of vertebrate brain Cerebrum, cerebellum, neural tube (spinal cord and brain in early development) Hindbrain, midbrain, forebrain Hindbrain Subdivides to form the myelencephalon (gave rise to medulla) Brain stem: medulla, pons, and midbrain
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Chap 41 notes - Neural Regulation Cnidarians have nerve...

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