Chapter 10 Nervous System Microglial cel
Chapter 10 Nervous System
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)
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 Central nervous Consists of system B rain Spinal Brain cord Spinal cord 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 Sensory or afferent Dorsal root of spinal nerve Dorsal root ganglion Motor Motor or efferent Sensory neuron neuron ·DiⅤ ISIons Spinal Spinal nerve cord Somatic nervous Spir Spinal nerve system cord Sensory recepto Ventral root Skeletal Autonomic nervous (b)of spinal nerve muscle Spinal nerve system(ANS) Spinal cord d Autonomic ganglion >Sympathetic >> Parasympathetic First motor neuron Second motor neuron > Enteric Effector organ(e.g, smooth (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
Nervous System organization Copyright e The McGraw-Hill Companies. inc Permission requred for reproduction or display Stimulus Response(output) (input) Skeletal Cardiac muscle, muscle smooth muscle and glands PNS Sensory division Somatic Autonomic Sensor ry conducts action nervous nervous receptors, potentials system system nerves, from the Motor division ganglia, periphery conducts action potentials and plexuses to the periphery CNS Brain and Processing and integrating information, spInal cord initiates responses, mental activity
Nervous System Organization