Neurons
What does the CNS consist of?
The brain and spinal cord
What do myelin sheath do?
Insulate the axon of a neuron
What is a reflex?
Fast, predictable, automatic responses to changes in the environment
Is grey matter myelinated or unmyelinated?
Unmyelinated
What part of the brain occupies most of the cranium and is divided into 2 hemispheres?
The cerebrum
What is another name for sensory neurons?
Afferent neurons
What cells cannot be repaired if damaged?
Oligodendrocytes
Somatic and Visceral (Autonomic)
What is another name for a neuron impluse?
Ion Exchange
What are the 3 layers of the meninges?
Dura Mater, Arachnoid, Pia Mater
What are the 3 types of neurons in the nervous system
Sensory, Integrative, and Motor
What are another name for neurolemmocytes?
Schwann Cells
What type of nerves do reflexes involve?
Spinal nerves
What chemical is in higher concentration outside the cell?
Na+ (Sodium)
What lobe controls memory, concentration, personality, reasoning, expressions, etc.
The Frontal Lobe
What are the two divisions of the ANS?
Sympathetic - stimulatory effect and Parasympathetic - inhibitory effect
What type of cells participate in brain development?
Astrocytes
What is a reflex arc?
A response by the body involving only the body segment being affected and the spinal cord
An electrical event due to movement of ions across a membrane
What percent of body weight does the brain make up?
2-3%
What do efferent neurons do?
Conduct nerve impulses from CNS to muscles and glands
What do ependymal cells do?
Help form and circulate cerebral spinal fluid
What are the 5 parts of the reflex arc in order?
Sensory receptor, Sensory Neuron, Integrating center (processing center), Motor Neuron, Effector (completes action)
Na+ moves in and K+ moves out of the cell, causing a change in what?
The polarity of the cell
What are grooves in the brain also known as?
Sulcus