Nervous system

• Nervous system - netwok of billions of nerve cell linked together
• Sensation - monitors changes occur in and outside the body via sensory nerves, sensory organs receive info and stimuli cause organism to respond
• Integration - process and interpret sensory info by brain/spinal cord to determine appropriate response
• Reaction - respond to the info by brain/spinal cord and activation of muscles/glands
• Central Nervous system - center of integration

  -consist of brain and spinal cord,
• Peripheral nervous system - outside the brain/Spinal cord
• Peripheral nervous system - consist of spiner nerves, cranial nerves
• Peripheral nervous system - responsible for communication between CNS and rest of the body
• Neuron or nerve cell - contains cell body
• Neuron or nerve cell - contains nucleus, organelles and two cytoplasmic extension
• dendrites - shorter, thinner, numerous, highly branched, receive incoming signal
• axon = longer,thicker, fewer branch, convey info, transmit impulse away from soma
• symphatic knob - end branch of axon,
• synaptic vesicles - bag of neurotransmitter
• myelin sheath - wrapped the axon
• • schwann cell forms myelin sheath which holds neuron in place,
• nodes of Ranvier - gaps in the axon that has no myelin sheath
• Brain - organ that receives sensory impulses and transmit motor
• CEREBRUM - largest part of the brain
• Cerebrum -brain of knowledge
• CEREBELLUM - second largest region of the brain called the little brain
• PONS - literally mean the bridge
• Pons - maintains respiratory and heart rhythm
• MEDULLA OBLONGATA - at the very base of the brain
• SPINAL CORD - protected by spinal column and transmit messages to and from the brain
• Spinal cord - serve as reflex center
• Reflex action - simplest nerve response
• Reflex action - quick act without thinking
• Stroke - is caused by a blocked blood vessel or bleeding in the brain.
• Epilepsy - characterized by a tendency for recurrent seizures.
• Hydrocephalus - also known as "water on the brain"
• Hydrocephalus - condition in which there is an abnormal accumulation of cerebrospinal fluid (CSF) in the ventricles, or cavities, of the brain.
• Encephalitis - an inflammation of the brain caused by a foreign substance or a viral infection
• Migraine - neurological disorder characterized by recurrent moderate to severe
• Alzheimer's disease - is a neurodegenerative disease typically found in people over the age of 65 years.
• Meningitis - is an inflammation of the meninges
• Meningitis- is an inflammation of the meninges of the brain and spinal cord and often caused by a bacterial or viral infection.
• Sensory division - afferent division
• Sensory division - sensory nerve fibers can be somatic(skin) and visceral(organs)
• Motor Division - efferent, conducts impulses from CNS to effectors(gland/muscle)