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Pupillary LightReflex
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??!
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relative afferent pupillary defect (RAPD)
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relative afferent pupillary defect (RAPD)
swinging-flashlight test
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relative afferent pupillary defect (RAPD)
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relative afferent pupillary defect (RAPD)
§ Usually before the chiasm problem§ Retinal detachment§ Ischemic retina§ Optic nerve : ischemia ,compression neuritis ,
recovered neuritis … etc§ diabetic retinopathy§ Demyelination (MS)
§ Unilateral Optic track lesion§ Unilateral mid brain lesion
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Accommodation and parasympathetic
The pupil near reflex
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Pupillary Adjustment
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extrastriatal
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light-near dissociation
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light-near dissociation • Adie’s tonic pupil• Damage to the dorsal mid-brain (tectal area) around
the cerebral aqueduct “but not the E W nucleus” • Stroke• Meningitis• Tumor• Neurosyphilis• Diabetic neuropathy• Demyelination (MS)
• Dorsal midbrain syndrome(Parinaud's Syndrome)
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Anisocoria
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Anisocoria
§ Efferent pathway or the eye it self§ Adie’s tonic pupil§ One side Dorsal midbrain syndrome§ Horner syndrome
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Corticospinal and CorticonuclearProjections
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Corticospinalpathway
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The Motor Cortex
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Text Fig. 25-6, see also Atlas Figs. 8-13, 8-14A and 8-14B
Corticospinal Fibers:-Somatotopy,-Laterality,-Trajectory
LEUEFace
Atlas Fig. 5-24
POT
FP
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Atlas Fig. 5-12
Internal CapsuleInternal Capsule in MRI
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Corticospinal Fibers In MRI:
Atlas Fig. 8-14A
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Corticospinal Fibers In MRI:
Atlas Fig. 8-14A
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Expanding Extramedullary Lesion
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Pyramidotomy
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5 months after pyramidal tract lesion:
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Corticonuclear Projections
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Corticonuclear Fibers
*
*
****
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Atlas Fig. 5-12
Internal CapsuleInternal Capsule in MRI
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Accessory Nerve CN XI
*
*
****
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Accessory Nerve CN XI
Motor neurons in the cervical spinal cord Trapezius & sternocleidomastoidmuscles
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Sternocleidomastoid Trapezius
Gray’s Anatomy for students: Figs. 8.171 page 920, 7.9 page 614
The sternocleidomastoid will tilt the head towards the shoulder on the same side,
Thereby, rotating the head to turn the face to the opposite direction
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Trigeminal Nerve: CN V
*
*
****
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Facial Nerve: CN VII
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Facial Nerve: CN VII
*
*
****
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Text Fig. 25-14
The Facial Nerve
Bell Palsy
Central Seven
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Corticonuclear Fibers
Nucleus ambiguus
Hypoglossal nucleus
Text Fig. 25-15
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Lesion of the Hypoglossal Nerve
Text Fig. 25-16
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Control of eye movement
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Fig. 28-13
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Third Nerve Palsy
Eye “down and out”
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Trochlear Nerve PalsyNote: Right eye
•Instead of intorsion and depressionaction of superior oblique
•See extorsion and elevation
Attempted Correction:
•Patient tilts head to her left•Tucks chin to foveate on object•Left eye will align accordingly
Observe how the axes overthe right eye shift when patient
generates a compensatory headmovement
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Conjugate Movements:1. Saccadic2. Tracking (pursuit)3. Vestibulo-Ocular Reflex4. Optokinetic Reflex
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Disconjugate Movements:
5. Vergence
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Basic pathwayfor controllingsaccadic eyemovements
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Basic pathwayfor controllingsaccadic eyemovements
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MLF
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Basic pathwayfor controllingvisual pursuiteye movements
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L R
L R
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Conjugateeyemovements
Disconjugateeyemovements
L R
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Conjugateeyemovements
Disconjugateeyemovements
X
Internuclear Ophthalmoplegia
L R
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ONE-AND-A-HALF SYNDROME
L R
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Brainstem Syndromes Involving Corticospinal Fibers and Cranial Nerves
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The Uncus and Uncal Herniation
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Uncus
Pernkopf Anatomy, Urban & Schwarzenberg, Munich, 1989, Figure 202
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Atlas Fig. 5-14
The Uncus and Uncal Herniation
Text Fig. 25-17
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The Kernohan Syndrome
Text Fig. 25-18Atlas Fig. 5-23
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Table 25-1