Nervous Tissue Flashcards
Functions of nervous system
Sensory, integration, motor activity
Structures of the nervous system
CNS: Brain & Spinal Cord
PNS: Cranial nerves, Spinal nerves, Ganglia, Enteric Plexuses, Sensory Receptors
Organization of the Nervous system
Central Nervous System
Peripheral Nervous System
Organization of the Nervous System:
The Brain has-
Spinal cord has -
Brain 100 Billion Neurons
Spinal Cord has 100 Million Neurons
Organization of the Nervous System
Source of thoughts, emotions, and memories
Central Nervous system ( CNS )
All nervous system structures outside of the CNS
Peripheral Nervous System (PNS)
Divisions of Peripheral Nervous system
Somatic (SNS), Autonomic (ANS), Enteric Nervous system (ENS)
Motor neurons to skeletal muscle: Voluntary
Somatic
Sympathetic:
Fight, fright, flight
Parasympathetic:
Rest and digest
Secrete hormones (involuntary)
Enteric nervous system
What is the Two cell types:
Neurons
Neuroglia cells
Can respond to stimuli and convert stimuli
Neurons
Critical for homeostasis
Neuroglia cells
Parts of neuron
Cell body, dendrites, axon, node of ranvier
Have several or many dendrites and one axon
Multipolar
Have one dendrite and one axon
Bipolar
Have fused dendrite and axon
Unipolar
Primarily myelinated axons
White matter
Cell bodies, dendrites, unmyelinated cells, axon terminals, neuroglia
Gray matter
Depolarizing phase
-70 -> 0 -> + 30 mv
Repolarizing cells
+30 mv-> 0 -> -55 -> -70 mv
Between the center
Synapse
What is NMJ?
Neuro muscular junction
