BIOL 205 Lecture Notes - Lecture 10: Central Canal, Axon Hillock, Dementia

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Biol 205 - chapter 31 - neurons and nervous system. Nervous system: a data processing system in the body: central nervous system (cns): consists of the brain and spinal cord. Contains interneurons (integrate info and relay signals: peripheral nervous system (pns): made up of the nerves (a communication line) that carry signals to the cns. Contains sensory neurons (convey signals from senses to the cns) and motor neurons (convey signals from cns to effector cells) Nervous system functions: sensory input: obtaining signals from sensory receptors (located in skin, eyes, mouth, etc) and conducting it to cns. Integration: processing and analyzing the signals (formulating a response to the signal: motor output: command sent from the cns to effector cells (muscles or glands) to carry out the response. Myelin sheath (insulating material) covers axon in beads (called. Gaps in between schwann cells are called nodes of ranvier (allows the signal to be transmitted quickly)

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