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61 terms

Nervous system

neurons, brain, vascular. of brain , innervation
STUDY
PLAY
Which of the neuroglial cells of the CNS acts like a macrophage in cleaning up debris?

a. oligodendrocyte
b. astrocyte
c. ependymal cell
d. microglia
d microglia
Two major division of the nervous system
1. CNS = brain + spinal cord
2. PNS = cranial nerves + spinal nerves
Which are the two major structural divisions of the CNS?
a. nerve and ganglion
b. nerve and fiber tract
c. ganglion and nucleus
d. white matter and gray matter
d
Which of the following terms describes an accumulation of nerve cell bodies in the PNS?

a. nucleus
b. ganglion
c. gray matter
d. peripheral nerve
b ganglion
Identify the connective tissue layer surrounding a single axon.
Answer
a. epineurium
b. perineurium
c. endoneurium
d. basal lamina
c-endoneurium
Which of the following meninges of the CNS is intimately applied to the surface of the brain and spinal cord?
Answer
a. pia mater
b. arachnoid
c. dura mater
d. ependyma
a pia mater
How many spinal nerves must be cut (lesioned) to totally denervate a single dermatome?
Answer
a. 1
b. 2
c. 3
d. 4
c. 3at least 3
Which of the following supporting cells is NOT found associated with neurons and their processes in the CNS?
Answer
a. microglia
b. astrocytes
c. ependymal cells
d. Schwann cells
d. schwann cells (myelin PNS)
Which structure is purely motor?

a. true spinal nerve
b. dorsal ramus
c. dorsal root
d. ventral rootlets
d. ventral rootlets
Which menginge (layer) of the CNS will split to form a dural venous sinus?
Answer
a. dura mater
b. arachnoid
c. pia mater
d. ependyma
c. pia mater
What are the two major divisions of the true spinal nerve once it exits the intervertebral foramen?
Answer
a. dorsal root and ventral root
b. dorsal ramus and ventral ramus
c. dorsal horn and ventral horn
d. anterior sulcus and posterior fissure
b. dorsal ramus and ventral ramus**
Which of the following dural venous sinuses is found in the attached border of the falx cerebri?
Answer
a. superior sagittal sinus
b. transverse sinus
c. inferior sagittal sinus
d. occipital sinus
a. superior sagittal sinus superior border (1)
c. inferior sagittal sinus *inferior border (2)
Which of the following is NOT an artery found in the arterial circle at the base of the brain?
Answer
a. anterior cerebral
b. basilar
c. common carotid
d. posterior cerebral
basilar
Which of the following properly described the structures that come together to form a typical spinal nerve?

a. dorsal rootlet and ventral rootlet
b. dorsal horn and ventral horn
c. dorsal root and ventral root
d. dorsal ramus and ventral ramus
c. dorsal root and ventral root
Which of the following cranial nerves contains parasympathetic fibers?
Answer
a. II (thalamus) optic
b. VII (m.oblaganta) Facial
c. VI(m.oblaganta)abduc eye
d. IV(trochelear)moveeye
Cranial nerves 3, 7, 9, 10 have for taste vision audition eq. olfaction.
Have parasympathetic ganglia
b.VII
Do cranial nerves have sympathetic fibers?
NO!!
Which of the following dural folds separates the cerebral hemispheres?
Answer
a. falx cerebelli
b. tentorium cerebelli
c. falx cerebri
d. diaphragma sellae
c. falx cerebri
The scythe-shaped fold of dura mater in the longitudinal fissure between the two cerebral hemispheres.
Functions of cranial nerves
1-5
Trigeminal Distribution CN V
General Function CN 6-12
Which of the following cranial nerves is parasympathetic to the thorax and abdomen?

a. III (OCCULOMOTOR)
b. VII (FACIAL)
c. IX (GLOSSOPHAR)
d. X (VAGUS)
D .X-VAGUS

PARASYMPATHETIC TO THOR AND ABD REGIONS VIA LOCAL GANGLION
Which of the following nerves does NOT arise from the brachial plexus?

a. femoral
b. median
c. ulnar
d. musculocutaneous
a. femoral (lower limb)
(median-radial-ulnar-musculaocut,)
Which of the following fibers types are NOT contained within cranial nerves?
Answer
a. motor
b. sensory
c. sympathetic
d. parasympathetic
C- sympathetic
Which of the following cranial nerves is not PURELY motor?
Answer
a. trochlear
b. oculomotor
c. abducens
d. hypoglossal
b-occulomotor
Because it has parasympathetic ciliary and sphincter pupillae muscles via ciliary ganglion
Purely sensory
CN1, CN2, CN 8, CN 5 (V1-V2)
O,O,VCoch, Ofthdiv, maxildiv
Purely motor
CN 4, 6, 11, 12
TAAH
Trochlear, abducens, accesory, hypoglossal
Motor& sensory
CN V 3 mandibular division
motor and parasympathetic
Oculomotor CN 3
Motor, sensory & parasympathetic
CN 7, CN 9, CN 10
Facial
Glossopha
Vagus
Ventral root carries ....fibers
motor fibers
Dorsal root carries .... fibers
sensory
Which of the following statements is FALSE?

a. the dorsal root carries only sensory fibers
b. the dorsal ramus carried only motor fibers
c. the ventral root carries motor fibers
d. the true spinal nerve contains motor and sensory fibers
b. the dorsal ramus carried only motor fibers

Can carry both!
What are visceral afferent fibers?
a.somatic sensory fibers from body wall
b.somatic sensory fibers from viscera
c.visceral sensory fibers from viscera
d.visceral motor fibers from viscera
c.visceral sensory fibers from viscera
Each true spinal nerve contains ____ and _____ fibers.
-Somatic
efferents-afferents
-Visceral (ANS)
Efferent -Afferent
Visceral (ANS) efferent
efferents-
-preganglionic symp. visc fibers (T1-L2)
-postganglionic symp fibers to target organ
(purple) vaso-motor outflow
Visceral (ANS)-Afferents
Afferents- come back thru white rami and travel down symp trunk before synapse w/in spinal cord
(yellow-sensory)
Somatic - Efferent
Motor to skeletal
Somatic Afferent
Peripheral sensory receptors into CNS
All sensory fibers including somatic afferent and visceral afferent must take the _____ back to spinal cord
Dorsal root
Visceral afferent fiber accesses ventral ramus via _______ and it is like the ___________.
White ramus communicans; preganglionic sympathetic fiber
Where does the visceral afferent fiber synapse?
At dorsal horn of gray matter in spinal cord - So does somatic afferent fiber!
What is the concept of pain?
Somatic afferent fibers synapsin in dorsal horn of gray matter along with visceral afferent fibers - (skin) brain confuses which is which - so pain is the sense given!
Models of pain to body wall
1- proximal-distal referred pain
(radiating pain)
2- Embryologically - derived ref. pain (place of pain - far is felt)
3-somatic/visceral referred pain
Splanchnic nerves conduct which type of fiber to what region of the body?

a. pre/post ganglionic sympathetic fibers to body wall
b. pre/post ganglionic sympathetic fibers to body viscera
c. somatic motor fibers to body viscera
d. somatic sensory fibers to body viscera
b. pre/post ganglionic sympathetic fibers to body viscera
What is the function of the white rami communicans?

a. take preganglionic sympathetic fibers to the sympathetic trunk for synapse
b. take postganglionic sympathetic fibers to the sympathetic trunk for synapse
c. take preganglionic parasympathetic fibers to the sympathetic trunk for synapse
d. take postganglionic parasympathetic fibers to the symapthetic trunk for synapse
c. take preganglionic parasympathetic fibers to the sympathetic trunk for synapse
White ramus comminicans is used because,,,,
preganglionic sympathetic fibers are myelinated and it helps them access the closest paravertabral ganglion
(purple)
Postganglionic sympathetics fibers reaccess forasal and ventral rami
via Gray ramus communications.(orange)
How many neurons are involved in relaying an impulse in an ascending tract?
3
Pain extending down the posterior region of the lower limb, from a herniated disc at L4/5 is due to which of the following:

a. embryological referred pain
b. dermatome pain
c. proximal-distal referred pain
d. somatic referred pain
c. proximal-distal referred pain
Which of the following fibers synapses in the intramural (terminal) autonomic ganglion?
a. preganglionic sympathetic
b. preganglionic parasympathetic
c. postganglionic sympathetic
d. postganglionic parasympathetic
b. preganglionic parasympathetic
Somatic (body wall) innervation runs along which of the following:
a. dorsal and ventral rami
b. gray and white rami communicans
c. splanchnic nerves
d. sympathetic trunk
a. dorsal and ventral rami
(green)
Which of the following facts concerning the parasympathetic division of the ANS is false?
a. neuron cell bodies of origin found in the brainstem
b. neuron cell bodies of origin found in spinal cord segments S2-S4
c. postganglionic parasympathetic fibers run in the ventral and dorsal rami to supply all body dermatomes
d. preganglionic parasympathetic fibers exit the spinal cord via the ventral root
c - postganglionic parasympatheric fiber run in the ventral and dorsal rami to supply all body dermatomes
FALSE
What is meant by a two neuron system in the
ANS?
meaning that from the CNS to the effector there are only 2 neurons
Which of the following ganglia facilitate the parasympathetic synapse in the wall of the effector organ?

a. paravertebral/sympathetic trunk
b. intramural/terminal
c. prevertebral/collateral
d. they all do
B
Which of the following facts concerning the sympathetic division of the ANS is FALSE?

a. sympathetic neuron cell bodies lie in the intermediolateral gray horn of T1 through L2
b. the closest site for synapse for the preganglionic sympathetic fiber is the sympathetic trunk (paravertebral ganglion chain)
c. collateral ganglia for sympathetic synapse lie along the base of the 3 main blood vessels of the abdomen
d. preganglionic sympathetic fibers leave the spinal cord via the dorsal root
d. preganglionic sympathetic fibers leave the spinal cord via the dorsal root

No they don't they exit the ventral root
Types of neurons
Unipolar-pseudounipolar (found in spinal cord) bypass soma
Bi polar - Axon, soma , dendrites
Multipolar- one soma 2 or more dendrites (most common-brain -spinal cord)
anaxonic neuron - no axon just dendrites (found in brain , retina adrenal medula)
Myelination
IN PNS - Schwann cells
In CNS-oligodendrocyte
Bundles of nerves,fascicles are covered by CT called
perineurium
Where is CSF made?
at choroid plexus within ventricular system
constantly secreted within the ventricles escapes to subarachnoid space and central canal - leaks into venous sinuses and arachnoid granulations
Where is CSF in the brain?
subarachnoid space
meninges