MUSIC 120 Lecture Notes - Lecture 11: Axon Hillock, Neuroglia, Schwann Cell
Document Summary
Organization of nervous system: central nervous system (afferent, brain and spinal cord, where information is integrated, sensory input. Inside and outside our body: peripheral nervous system (efferent, somatic nervous system, skeletal muscles, autonomic nervous system, work together to create homeostasis, using a lot of energy, parasympathetic. Histology of nerve tissue: two principle cells of the nervous system, neurons: excitable cells that transmit electrical signals, structural units of the nervous system. Composed of a body, axon, and dendrites. Long-lived, high metabolic rate: their plasma membrane functions in: Cell-to-cell signaling during development: neuroglial: supporting cells. Functional classes of neurons: sensory (afferent) neurons: detect stimuli. Interneurons: receive the information and integrate: motor (efferent) neurons: respond. Increase the speed of nerve impulse transmission: schwann cell wraps around the axon, 300 layers in myelin sheath, cell membrane has a lot of lipid, neurilemmal superficial, spots along the axon have nodes between the schwann cells.
