Name the two parts of the Nervous system
central nervous system and peripheral nervous system
What are the two types of cells in the nervous system?
Nerve cells (neurons) and glial cells
Name the parts of a neuron
cell body (part of which is called the axon hillock), nissl substance, axon, dendrites
What is the part of a neuron that receives impulses?
What is the part of a neuron that sends impulses?
What is the name of the pigment that shows lysosomes with undigested debris in nerve cells?
Axons branch terminally into what?
What are the 3 parts of a neuron synapse?
Presynaptic axon terminal
What is the space between the pre and post synaptic structures called?
Are neurons or glial cells more abundant in the brain?
glial cells (10x more)
What is the function of glial cells?
They support and protect neurons by supplying nutrients
What are the 5 types of Glial cells?
Where are astrocytes found?
What is the function of astrocytes?
Provides structural support, helps repair cells, participates in blood-brain barrier,
What is the most numerous of all glial cells?
What is the name of the intermediate filament found in astrocytes?
Glial fibrillary acid protein (GFAP)
Where are oligodendrocytes located?
What is the function of oligodendrocytes?
produces myelin in CNS and insulates axons
Where are Schwann cells located?
What is the function of Schwann cells?
forms the myelin sheath in PNS to insulate axons
Where are ependymal cells found?
CNS: Lining cavities of the brain and spinal cord.
Where are microglial cells found?
What is the function of microglial cells?
Eats up debris and dead cells
What is the name of the dense network of astrocyte processes, axons, and dendrites within gray matter?
What part of the brain contains neuron cell bodies, dendrites, unmyelinated axons, glial cells and synapses
What part of the brain contains myelinated axons and oligodendrocytes
Describe where white and gray matter are located in the brain?
Gray matter is outside (and very deep inside) white matter is inside
Describe where white and gray matter are located in the spinal cord?
Gray matter is inside and white matter is outside
How many layers does the cerebral cortex have?
What is the most abundant type of neuron in the cerebral cortex?
How many layers of gray matter are there in the cerebellum?
3 (molecular layer, purkinje cell layer, and granular layer)
Name the 3 layers of the meninges
dura mater, arachnoid, pia mater
What is the function of the blood brain barrier?
Prevent passage of some drugs and toxins from blood into CNS tissue
What are the nodes of Ranvier?
gaps in the myelin sheath within the PNS
What is a collection of neuron cells within the PNS called?
What are the 3 types of nerve bundles?
What is the name of the cell located in the roof of ventricles in the brain that forms the choroid plexus?
Which cell is responsible for the production of Cerebrospinal fluid (CSF)?
Ependymal cells (specifically of the choroid plexus)