Section 9 The Nervous System
Section 9 The Nervous System
Chapter 29 Cells in Nervous System and Their Function ● Neurocyte ● Neuroglia( Glia cell
Chapter 29. Cells in Nervous System and Their Function ⚫ Neurocyte ⚫ Neuroglia (Glia cell)
The Nervous System Components Brain, spinal cord, nerves, sensory receptors Responsible for Sensory perceptions, mental activities stimulating muscle movements, secretions of many glands SubdivⅤ nsions Central nervous system(CNS) Peripheral nervous system(PNS)
The Nervous System • Components – Brain, spinal cord, nerves, sensory receptors • Responsible for – Sensory perceptions, mental activities, stimulating muscle movements, secretions of many glands • Subdivisions – Central nervous system (CNS) – Peripheral nervous system (PNS)
Central Nervous System OThe McGrawHll Companies he Pe Centra nervous system Consists of Brain Spinal Brain cord p Inal cor 战绕 Brain and spinal cord Continuous with each other Cranial Spinal nerves nerves Peripheral nervous system
Central Nervous System • Consists of – Brain – Spinal cord • Brain and spinal cord – Continuous with each other
Peripheral nervous system Two subcategories Dorsal root of spinal nerve Dorsal root ganglion Sensory or afferent Motor Sensory neuron neuron Motor or efferent Spinal Spina Divisions nerve cord Spinal Spinalnerve Somatic nervous cord Sensory receptor ystem Ventral root Skeletal (b) of spinal nerve muscle Autonomic nervous Spinal nerve system(ANS) Spinal cord d Autonomic ganglion > Sympathetic First motor neuron ))Parasympathetic Second motor neuron Effector organ(e.g, smooth >> Enteric (c) muscle) Large intestine
Peripheral Nervous System • Two subcategories – Sensory or afferent – Motor or efferent • Divisions – Somatic nervous system – Autonomic nervous system (ANS) »Sympathetic »Parasympathetic »Enteric