01:119:116 Lecture Notes - Lecture 20: Medulla Oblongata, Mollusca, Central Canal

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: All

Document Summary

Simplest animals with nervous systems, no central control organ. Nerve net: interconnected neurons; impulses conducted both directions spreading through net. Nerve ring: central control structure; signals radial nerves signals muscles. Glial cells (glia): cells of the nervous system that doesn"t directly transmit messages: types. Membrane rich in myelin form myelin sheath. Immune cells: phagocytic respond to injury or infection. Newly formed neurons migrate from neural tube along tracks. Central nervous system (cns: brain: central control organ. Grey matter made of cell bodies, dendrites, axons. Cerebrospinal fluid supply nutrients, hormones, takes waste away: spinal cord: link between brain and rest of ns; dorsal, neck/back, within sipne. Peripheral nervous system (pns): nervous tissue not part of cns; transmits to/from. Iv: sensory receptors - detection of stimuli, nerves: transmits info to and from cns. Innervate head and upper body: functional components of pns. Afferent (sensory): sensory receptor cns; receptors involved but no effectors (bring info in, but don"t respond to it)