Neurology Falcon Review 1 Flashcards
What are the major structures of the brain
From anterior to posterior
- Telencephalon
- diencephalon
- Mesencephalon
- Metencephalon
- Myelencephalon
Remember the M’s being Alphabetical order.
What develops from the telencephalon
Cerebral cortex
basal ganglia
What develops from the diencephalon
Thalamus
hypothalamus
What develops from the mesencephalon
Midbrain
– cerebral crura
– substantia nigra
– CN’s 3 and 4
What develops from metencephalon
Cerebellum
Pons
CN’s 5, 6, 7, 8
What develops from the myelencephalon
Medulla oblongata
CN’s 9, 10, 11, 12
What are the main lobes of the cerebral cortex
Frontal
parietal
Occipital
temporal
What is the function of the frontal lobe
Motor function problem-solving (executive function) spontaneity language impulse control social behavior largest in humans
What is the general function of the parietal lobe
- awareness
2. spatial perception
What is neglect syndrome
Results in the neglect of part of the body or space on the contralateral side; can impair many self-care skills such as dressing and washing
What is Gerstmann’s syndrome
A left-sided lesion to the parietal lobe causing: – R/L confusion – Agraphia – Acalcula – Aphasia – visual agnosia
What will a lesion to one side of the occipital lobe cause
Homonymous loss of vision with exactly the same “field cut” in both eyes
What are the effects of a left temporal lobe lesion
Disturbs recognition of words
imperative memory of verbal material
What are the effects of a right temporal lobe lesion
– can cause a loss of inhibition of talking
– inhibition of recall of music and drawing
What are the functions of the temporal lobe
Sensory
language
memory
behavior
What function does the precentral gyrus have
Motor strip
What function does the Post Central gyrus serve
Somatosensory strip
The central sulcus separates what 2 areas of the brain
The frontal from the parietal lobe
What areas of the brain are separated by the lateral sulcus (sylvian fissures)
Separates frontal and parietal lobe from the temporal lobe
What should always be identified from a sagittal view MRI
The central sulcus cerebellum Pons Medulla corpus callosum tonsils
What may low-lying tonsils cause
Increased intra-cranial pressure
Is the genu of corpus callosum anterior posterior
Anterior
the splenium of the corpus callosum is posterior
On MRI T1 weighted sequence is CSF black or white
Black
On an MRI T2 weighted sequence is CSF black or white
White
when is a CT bone window useful
For traumatic brain injury and skull fractures
When is a CT brain window useful
Hemorrhage and atrophy
What modality is useful for detecting demyelination disease and old infarcts
T2 weighted MRI
What 3 things are bright on axial CT brain window
Bone
blood
calcifications
What 2 brain regions are derived from the diencephalon
Thalamus
hypothalamus
What is the role of the thalamus
Central relay station for all sensory and motor information EXCEPT OLFACTION
What is the role the hypothalamus
Sympathetic control
parasympathetic control
temperature control
satiety center
What is the Marcus-Gunn pupil
– paradoxical dilation of pupil with the light on the pupil
– caused by delay in conduction of the optic nerve typical of demyelinating disease such as MS
What is the only cranial nerve that innervates the contralateral eye
Trochlear nerve
– supplies contralateral superior oblique
What will lesion of cranial nerve 7 demonstrate
It will affect the entire face on one side. A stroke will affect only the lower part of the face
What direction are afferent fibers traveling
Towards the CNS
what direction are efferent fibers traveling
Away from the CNS
– effector nerves are efferent
What is cranial nerve 9
Glossopharyngeal nerve
What is the function of the glossopharyngeal nerve
Palatal muscles
palatal and pharynx sensation
taste of her posterior one 3rd of the tongue
gag reflex (afferent limb)
What is the function of the vagus nerve
Palatal muscles
pharynx and larynx sensation
parasympathetic to viscera (heart, G.I. tract)
gag reflex (efferent limb)
What is cranial nerve 12
Hypoglossal nerve
What are the 4 main arteries that carry blood to the brain
Carotids X2
Vertebrals
What does the anterior cerebral artery supply to
Primarily supplies the frontal and medial aspect of the frontal and parietal lobes
What does the middle cerebral artery supply
The vast majority of the brain
– the lateral surface
– is a branch of the internal carotid
What are the 2 main branches of the middle cerebral artery
Anterior (Brocha’s area)
posterior (Vernicke’s area)
The posterior cerebral artery is a branch of what vessel
Basilar artery
Lacuna stroke in the internal capsule will generate what symptoms
Will generally be a pure motor weakness
Lacunar stroke in the thalamus will have what signs and symptoms
typically sensory
Discuss the anterior spinal artery
It’s a fusion of the vertebral arteries, located in the anterior median fissure, supplies the anterior 2/3 of the spinal cord
Discuss the posterior spinal arteries
their smaller arteries, derived from the PICA, they form plexus, and supplies the posterior 1/3 of the spinal cord
Discuss radicular arteries
They are from the aorta, send collaterals to the spinal cord, and forms the caudal most portion of the anterior spinal artery
The deep tendon reflexes the biceps test what nerves
C5, C6
The deep tendon reflexes for the brachioradialis test what nerves
C5, C6
The deep tendon reflexes for the triceps test what nerves
C7