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Chapter 10

Ch. 10 highlighted info- Mrs. Neutzlings Class

There are more than__ ____ nerve cells 100 billion
The nervous system is classified into 2 major divisions, which are? Central Nervous System (CNS) & the Peripheral Nervous System (PNS)
The CNS consists of the ___ & ___ ____ Brain & Spinal Cord
The PNS consists of? Spinal Nerves, Cranial nerves, plexuses & peripheral nerves throughout the body.
In addition to the spinal & cranial nerves the PNS also contains a large group of nerves that function involuntarily or automatically, w/out conscious control. These nerves belong to the? Autonomic Nervous System (ANS)
Some of the autonomic nerves are ____ nerves and others are ______ nerves Sympathetic, Parasympathetic
The _____ nerves stimulate the body in times of stress & crisis Sympathetic
The¬¬¬ _____nerves normally act as a balance 4 the sympathetic nerves Parasympathetic
A ____ is a large network of nerves in the PNS. Plexus
A ____ is an individual nerve cell Neuron
A ____ begins an impulse in the branching fibers of the neuron, which are called? Stimulus, Dendrites
Axons can be covered with a fatty tissue called? Myelin Sheath
The ____ ____ gives a white appearance to the nerve fiber- hence the term white matter, as in parts of the spinal cord and the white matter of the brain and most peripheral nerves. Myelin Sheath
NOTE: The gray matter of the brain and spinal cord is composed of the cell bodies of neurons that appear gray because they are not covered by the myelin sheath
The space where the nervous impulse jumps from one neuron to another is called? Synapse
The transfer of the impulse across the synapse depends on the release of a chemical substance called a? Neurotransmitter
Example of Neurotransmitter is? Acetylcholine
Peripheral nerves that carry impulses to the brain and spinal cord from stimulus receptors is called? Sensory Nerves
Examples of sensory nerves Skin, eye, ear, and nose
Peripheral nerves that carry impulses from the CNS to organs that produce responses are? Motor Nerves
Examples of Motor nerves are? Muscles & glands
There are 4 types of Glia (neuroglia) cells. They are? Astrocytes (astroglial cells) Microglial cells, Oligodendroglial Cells, Ependymal cells
? cells are supportive & connective in function Neuroglial
The ---- controls body activities, it weighs about 3 lbs in adults and has many different parts, all of which control different aspects of body functions. Brain
The largest part of the brain is the thinking area or ________ Cerebrum
On the surface of the brain Cerebral Cortex
Folds are called Gyri
Grooves are known as? Sulci
The brain is divided in ½ a rt side & left side which are called? Cerebral Hemispheres
In the middle of the cerebrum, there are spaces, or canals called Ventricles
Ventricles contain a watery fluid that flows throughout the brain and around the spinal cord. The fluid is called? Cerebrospinal Fluid (CSF)
Pons & medulla are part of the? Brainstem
Cerebellum is located? Beneath the posterior part of the cerebrum
Nerves tracts cross from right left and left to right in the _____ _____. Medulla Oblongata
The medulla oblongata contains 3 important vital centers that regulate internal activities of the body Respiratory Center, Cardiac Center & Vasomotor Center
Affects (constricts or dilates) the muscles in the walls of blood vessels Contains the center
Created by: jdunn