STUDY QUESTIONS IN THE TG Flashcards
Structures that protect the CNS:
Mylination
Meningies
vetebral column
neuroganglia
What are the three layers of the meninges?
Dura -outer
Arachnoid
Pia - covers the spinal cord/ brain
Where is the CSF made and where is it reabsorbed?
Epidimal cells
choroid plexis
absorbed in the arachnoid villi
Where is the CSF ciruclating in the CNS?
ventricles-> subarachnoid space to the villi
Where does the spinal cord start and where does it end?
T1-L2
What are the grooves that separate the spinal cord in halves?
anteror median fissure
posterior median sulcus
What is the difference between the dorsal root and the ventral root?
ventral roots (anterior roots) allow motor neurons to exit the spinal cord.
dorsal roots (posterior roots) allow sensory neurons to enter the spinal cord.
What are the different plexi of the spinal nerves and what parts of the body do they control?
Cervical Plexus—Serves the Head, Neck and Shoulders. …
Phrenic nerve (C3, C4, C5) innervates the diaphragm to contract.
Brachial Plexus—Serves the Chest, Shoulders, Arms and Hands. …Radial nerve (C5-T1), Ulnar nerve (C8-T1), Axillary nerve (C5- C6)
Lumbar Plexus—Serves the Back, Abdomen, Groin, Thighs, Knees, and Calves. …Femoral nerve (L2-L4)
Sacral Plexus—Serves the Pelvis, Buttocks, Genitals, Thighs, Calves, and Feet. Sciatic nerve (L4-S3)
Why are T2-T12 different compared to other vertebral sections and what do they control?
intercostal nerves
Supply muscles of abdomen and between the ribs, skin of chest and back
State the functions of the pathways in the spinal cord:
a. Corticospinal tract:
b. Spinothalamic tract:
a: Precentral Gyrus -> lower moter neurons intervates muscle movement
b: Sensory neurons touch, pain, temp towards the brain
Posterior column-medial lemniscus pathway:
Brain
a. How much oxygen does the brain require and how long does it take for hypoxic damage to occur?
20% O2
Brain neurons deprived of oxygen for 4+ minutes may lead to permanent damage
Blood brain barrier:
b. What cells make up the BBB?
c. What is the function?
Blood brain barrier protects the brain cells from harmful substances and pathogens.
(a) Allows passage lipid-solubleble materials such as O2, CO2, alcohol, anesthesia
(b) Consists of tightly sealed blood capillaries and astrocytes.
(c) Can be broken down by trauma, certain toxins, and inflammation.
State of components and functions of the:
a. Brainstem (3 parts):
b. Limbic system:
c. Cerebrum:
d. Cerebellum:
Medulla Oblongata VIII-XII
a) Cardiovascular center regulates
b) Medullary rhythmicity area regulates breathing
Pons V-VIII
1) “Bridge”
2) Contains ascending (sensory) and descending (motor) tracts
3) Connects left and right sides of the brain
4) Nuclei
a) Motor relay from the cerebrum to the cerebellum
b) Helps control breathing
Midbrain III and IV
Cerebral peduncles: Large tracts that contain axons of motor neurons from the cerebrum to the rest of the brainstem and spinal cord
Limbic system:
emotional brain
involuntary survival behavior
part of memory development
Cerebrum:
Largest superior part
Corpus Callosum
Longitudinal Fissure -left and right hemi
Central sulcus- antieror/ posterior
Layers:
Cortex -grey matter
White matter
Basal Ganglia cognitive processes
Folds -gyri
shallow grooves - sulci
Prescentral gyrus anterior:motor
Postcentral gyrus posterior: somatosensory
Wernike’s -interpret
Broca’s - speech
Cerebellum:
Little brain
Fx equalibrium and coordination balance
What are the components of the diencephalon and state significance of each part (there are 3 structures)?
Thalmus
-sensory relay center
-contributes to motor fx
-consciousness
Hyopthalmus
-homeostasis
-pituitary/ hormone production
-ANS
-eating drinking
-reg body temp
-reg sleep pattern
Pineal Gland
-melitonin
Where are the following sensory areas:
a. Visual area:
b. Auditory area:
c. Gustatory area:
d. Olfactory area:
Occipital Lobe
Temportal Lobe
Postcentral Gyrus
Medial aspect of the temporal Lobe
Where is the primary motor area?
Precentral Gyrus
Muscle movement duplicate voluntary
What are the cranial nerves’ name and what are the function and components (i.e. purely
sensory, purely motor, or mixed)
CN1 S Olfactory-smell
CN2 S Optic - vision
CN3 M Ocularmotor
CN4 M Trochlear
CN5 B Trigeminal -chew ans general sensory
CN6 M Abducen
CN7 B Facial -taste, facial muscle
CN8 S Vesticolcholear -equalib, hearing
CN9 B -Glossophar - taste, bp swallowing
CN10 B - Vagus - sensory abd throrasic motor
CN11 M - Spinal Ass - trap and head movement
CN12 M - Hypoglossal- motor tongue
Name the three neurons in the Somatic Sensory Pathway.
Cell body #1 in dorsal root ganglion
Cell body #2 in the spinal cord or brain stem
Cell body #3 in the thalamus; axon extends to the cerebral cortex (somatosensory area in postcentral gyrus)
What reflex occurs at spinal nerve level T8, T9, and T10?
abdomen and/or lower in the back
What reflex occurs at spinal nerve level L5, S1, and S2?
Plantar
What are the subdivisions of the autonomic nervous system?
Sympathetic (S) division + parasympathetic (P) division
Name the two neurons in the sympathetic division pathway.
Sympathetic preganglionic neurons
T1-L2 thoracolumbar division
Results in widespread S effects occurring simultaneously
epinephrine and norepinephrine
Sympathetic postganglionic neurons
S “trunk ganglia
pass back into spinal nerves
“prevertebral ganglia”
Supply abdominal viscera: stomach, intestine, kidneys, liver, spleen
What does SLUDD stand for?
1) Salivation
2) Lacrimation
3) Urination
4) Digestion
5) Defecation
How do we test for meningeal irritation? (know names of the tests and how to do them)
Positive Brudzinski and/or Kernig signs may indicate meningeal irritation.
Nuchal rigidity
How do we test for balance?
Romberg
Gait
How do we test deep tendon reflexes and how is it graded?
REFLEX SPINAL NERVE LEVEL EVALUATED
Superficial
Upper abdominal T8, T9, and T10
Lower abdominal T10, T11, and T12
Cremasteric T12, L1, and L2
Plantar L5, S1, and S2
Deep Tendon
Biceps C5 and C6
Brachioradial C5 and C6
Triceps C6, C7, and C8
Patellar L2, L3, and L4
Achilles S1 and S2
GRADE DEEP TENDON REFLEX RESPONSE
0 No response
1 + Sluggish or diminished
2 + Active or expected response
3 + More brisk than expected, slightly hyperactive
4 + Brisk, hyperactive, with intermittent or transient clonus
What parts of the spinal cord do the following test:
1. Ankle:
2. Patellar:
3. Cremasteric:
Cremasteric T12, L1, and L2
Patellar L2, L3, and L4
Achilles S1 and S2
What are the symptoms of a seizure?
a) Facial grimacing
b) Gesturing
c) Lip smacking
d) Chewing
e) Repeating words or phrases
What are etiologies and risk factors that can lead to new onset seizure?
Young adults (18-35 years
(a) Trauma
(b) Metabolic disorders (Alcohol withdrawal, uremia, hyper/hypoglycemia)
(c) CNS Infection
Older adults (>35 years)
(a) Cerebrovascular disease
(b) Brain tumor
(c) Metabolic disorders
(d) Degenerative disorders (Alzheimer)
(e) CNS Infection
What is status epilepticus?
(EMERGENCY)
A single seizure lasting more than or equal to 5 minutes or 2 or more seizures between which there is incomplete recovery of consciousness
What is the difference between partial and generalized seizures?
Partial
One-sided
Generalized seizures
1) Involves the entire brain
2) May or may not lead to alteration of consciousness
3) Most common type is the tonic-clonic seizure (AKA grand mal)
a) Tonic phase characterized by sudden muscle stiffening
b) Clonic phase characterized by rhythmic jerking
(1 Tongue biting is expected in this phase
c) Episodes usually last 1-2 minutes
Describe the following:
Tonic-clonic:
Absence:
Myoclonic:
Complex partial:
Simple partial:
Psychogenic non-epileptic:
Focal seizure with retained awareness
1) Formerly known as simple partial seizure
Focal seizure with impaired awareness
1) Formerly known as complex partial seizure
3) Most common type is the tonic-clonic seizure (AKA grand mal)
a) Tonic phase characterized by sudden muscle stiffening
b) Clonic phase characterized by rhythmic jerking
(1 Tongue biting is expected in this phase
c) Episodes usually last 1-2 minutes
Absence seizure causes you to blank out or stare into space for a few seconds. They can also be called petit mal seizures.
Psychogenic nonepileptic seizure
a) PNES episodes usually last longer than 2 minutes
b) Patients eyes are closed during PNES events
c) Incontinence is less common in PNES
d) Usually there is no postictal phase in PNES
Describe post-ictal phase?
-Somnolence, confusion or headache that may occur for several hours
-Patient often have no recollection of event
-Weakness of limbs may occur (“Todd paralysis”)
What is the initial management and treatment for seizures?
1) First Aid
2) Treatment for active seizure
Diazepam 5 mg IV/IM Q5-10 minutes; do not exceed 30 mg
Valperic acid
MEDEVAC immediately
(1) Abrupt onset of unilateral facial paralysis
(2) Pain about the ear precedes or accompanies the weakness in many cases but usually lasts only for a few days.
(3) Face feels stiff and pulled on one side
(4) May be ipsilateral restriction of eye closure and difficulty with eating and fine facial
movements.
(5) May have changes in taste
(6) Tearing (68%) or dryness of the eye (16%) and less frequent blinking on the affected side
(7) Bell’s phenomenon (upward rolling of the eye on attempted lid closure)
Bell’s palsy
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