Nervous System Flashcards
helps to maintain homeostasis
Nervous System
responsible for behavior, memories, movements
Nervous System
Process of Nervous System
1.Detect Stimuli
2. Process the Information
3. Respond
Cells in Nervous Tissue
Neurons, Neuroglia
conduct nerve impulses/ electric signals
Neurons
analyse information, store memories, direct responses
Neurons
support, nurture, protect neurons
Neuroglia
form insulating cover around many neurons
Neuroglia
insulating cover around many neurons
Myelin Sheath
functional unit of the nervous system
Neurons
Neuron Structure
Dendrites, Cell Body, Axon, Axon Terminal
detects changes — carry electric signals toward cell body
Dendrites
integrates incoming signals and initiates nerve impulses
Cell body
conducts nerve impulse away from the cell body
Axon
insulate section of axon
Myelin sheath
speed up conduction of nerve impulses
Myelin sheath
release neurotransmitters which allows the electrical impulse to jump to another neuron,muscle,gland
Axon Terminal
3 Types of Neurons
Sensory, Motor, Interneurons
receptors to CNS
Sensory Neurons
process/integrate info (only found in CNS)
Interneurons
CNS to muscles or glands
Motor Neurons
gaps/separation of nerve cells
Synapses
secrete neurotransmitters at the axon terminal
Synapses
Division of Nervous System
Central and Peripheral
consists brain and spinal chord
Central Nervous System
consist of cranial nerves (12pairs) and Spinal Nerves (31 pairs)
Peripheral Nervous System
Division of Peripheral Nervous System
Somatic and Autonomic
From receptors of limbs/body/head to CNS then CNS to skeletal muscles
Somatic Nervous System
sensory impulse from visceral organs to CNS then CNS to cardiac,smooth muscles and glands
Autonomic Nervous System
Division of Autonomic Nervous System
Sympathetic and Parasympathetic
prepare the body for “E” situations (emergency,exercise, energy expenditure)
Sympathetic Nervous System
fight/flight
sympathetic nervous system
prepare the body for res recovery and healing
parasympathetic nervous system
rest and digest
parasympathetic nervous system
detect stimulus (generate nerve impulse)
Receptors
receptors to CNS
Afferent ( Sensory Neurons)
process sensory information and decide on motor Response
CNS
CNS to Effectors
Efferent (Motor Neurons)
muscle/glands that alter their activity
Effector
rapid, predictable sequence of involuntary actions that is a response to particular stimulus
Reflex
is the nervous system pathway followed by nerve impulse to produce a response
reflex arc
Region of the brain
Cerebrum, Cerebellum , Brain stem
has many convolutions which effectively triple its surface area
Cerebrum
80 % of brain mass
Cerebrum
initiate voluntary motor activity
Cerebrum
analyze information for thinking and learning
Cerebrum
part of the brain that store memories
Cerebrum
highly folded surface
Cerebellum
provide smooth, coordinated skeletal muscle movements
Cerebellum
regulates posture and maintains balance subconsciously
Cerebellum
part of the brain that connects to the spinal chord
Brainstem
has center for controls of basic functions for survival (cardiac and respiratory)
Brainstem
Lobes of the Cerebrum
Parietal, Frontal, Occipital, Temporal
lobe that contains primary
lobe that control conscious awareness of sensation
Parietal Lobe