Chapter Nine: Nervous System Flashcards
What three things does the nervous system do?
Gather Information
Process Information
Generate Response
What is the basic unit of the Nervous System?
The Neuron
The neuron is supported by…(glial cells) that provide energy, protection, and structure
Neuroglia
What neuroglia of the CNS?
- regulate what enters the CNS by surrounding localized capillaries
Astrocytes
What neuroglia of the CNS?
- Phagocytic cells that destroy pathogens and debris
Microglia
What neuroglia of the CNS?
- provide insulating myelin sheath around axon
Oligodendrocytes
What neuroglia of the CNS?
- produce cerebral spinal fluid which circulates nutrients
Ependymal
What neuroglia of the PNS?
- prove insulating myelin sheath around axon (similar to oligodendrocyte)
Schwann
What neuroglia of the PNS?
- surround neuron body and regulate material exchange (similar to astrocytes)
Satellite
Chemical messengers are known as…
Neurotransmitters
Neurotransmitters are stored in…for release
Synaptic Vesicles
They are released into the..in response to an action potential
Synaptic Cleft
…are on the post-synaptic membrane receive neurotransmitters to elicit change
Receptors
Structure of a nerve:
- encapsulates individual myelinated axons
Endoneurium
Structure of a nerve:
- surrounds individual fascicles
Perineurium
Structure of a nerve:
- surrounds the entire nerve (includes all fascicles and blood vessels)
Epineurium
What are the six regions of the brain?
Cerebrum
Cerebellum
Diencephalon
Mesencephalon
Pons
Medulla Oblongata
What is the function of the cerebrum?
conscious thought and higher learning
What are the four lobes of the cerebrum?
Frontal
Parietal
Temporal
Occipital
What are the folds in the cerebrum called?
Gyri
What are the valleys in the cerebrum called?
sulci
…connects the two hemispheres of the cerebrum
Corpus Callosum
What is the second largest region of the brain?
Cerebellum
What is the function of the Cerebellum?
monitor body position and coordinate movement
What is the “tree of life” in the cerebellum called?
Arbor Vitae
The Diencephalon (forebrain) includes what two things?
Thalamus
Hypothalamus
What does the Thalamus do?
interpreting sensory information
What does the Hypothalamus do?
emotions, instincts, and link to endocrine system
What does the brain stem do?
conduct basic house keeping and survival tasks of body
What are the three regions of the brain stem?
Mesencephalon (midbrain)
Pons
Medulla
What is the role of the Mesencephalon (midbrain)?
subconscious processing visual and auditory reflexes
What is the role of the pons?
relay station
What is the role of the medulla?
Coordinate breathing and heart patterns, swallowing reflex
Ventricles produce and circulate…
cerebral spinal fluid (CSF)
Most CSF is produced in the…by certain cells that are found in the ventricles
Choroid Plexus
Most CSF is produced in the choroid plexus by what kind of cells?
Ependymal Cells
What is this?
- tangled mass of capillaries hanging from roof of third and fourth ventricles
Choroid Plexus
What are the three parts of the Meninges?
Dura Mater
Arachnoid Mater
Pia Mater
What are the two parts of Dura Mater?
Periosteal
Meningeal
Inflammation of the meninges is known as…
meningitis
What kind of matter?
- primarily composed of neuron cell bodies and unmyelinated processes
Gray Matter
What kind of matter?
- primarily myelinated axons; found superficially surrounding the gray matter
White Matter
The left and right halves of the spinal cord are…
Symmetrical
What are dermatomes?
A zone in the body that each spinal nerve serves
What does the cervical dermatome consist of?
superior portion of the back and the posterior portion of the upper limbs
What does the thoracic dermatome consist of?
Body trunk and anterior aspect of upper limbs
What does the lumbar dermatome consist of?
Inferior part of the back and anterior aspect of lower limbs
What does the sacral dermatome consist of?
Buttocks, perineum and pubic regions, and posterior aspect of lower limbs
The brachial plexus is a network of nerves that innervates what three things?
Shoulder
Arm
Hand
The Brachial Plexus is formed through the ventral roots of C5-…
T1
The ventral roots converge to form three trunks (what three?) with each having an anterior and posterior division
Upper
Middle
Lower
The anterior and posterior divisions of the brachial plexus converge to form what three cords?
Lateral
Medial
Posterior
The major terminal branches include what four things?
- Musculocutaneous Nerve
- Median Nerve
- Ulnar Nerve
- Radial and Axillary Nerve