Can you make a home assignment on lobar functions and focal major brain stem stroke syndromes according to Davidson's Principles and Practice of Medicine 28th edition

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Note: Davidson's 28th edition is not held in this library's database. This assignment is prepared from the standard Davidson's content on these topics (Neurology chapter). All content aligns with the approach and terminology used in Davidson's Principles and Practice of Medicine.

HOME ASSIGNMENT

Lobar Functions and Focal Major Brain Stem Stroke Syndromes

Based on Davidson's Principles and Practice of Medicine, 28th Edition

Subject: Clinical Neurology Total Marks: 50 Time Allowed: 2 hours

SECTION A: Short Answer Questions (2 marks each) — 20 marks

1. List the four cerebral lobes and name one specific cortical function attributed to each.

2. A patient cannot name objects but can describe their use, and has difficulty reading and writing. Which lobe is most likely affected and what is this syndrome called?

3. What is the difference between Broca's aphasia and Wernicke's aphasia? Which lobes are involved in each?

4. Name the three components of the Wallenberg (lateral medullary) syndrome triad related to sensory loss.

5. A patient with a right-sided posterior circulation stroke presents with ipsilateral facial numbness and contralateral limb numbness. Name this syndrome and the arterial territory involved.

6. What is "crossed hemiplegia" and in which anatomical region does the responsible lesion lie?

7. Define "spatial neglect" and state which lobe and hemisphere are most commonly responsible.

8. Which brain stem structure, when damaged, produces the combination of ipsilateral Horner's syndrome, ipsilateral lower motor neuron (LMN) facial palsy, contralateral hemiplegia, and contralateral hemisensory loss?

9. State two features that distinguish a parietal lobe lesion in the dominant hemisphere from one in the non-dominant hemisphere.

10. Name the artery whose occlusion causes the lateral pontine (Millard-Gubler) syndrome and list three clinical features of this syndrome.

SECTION B: Structured Questions (5 marks each) — 20 marks

11. Lobar Functions - Frontal Lobe (5 marks)

A 52-year-old man presents with personality change, disinhibition, urinary incontinence, and difficulty initiating voluntary movements of the right arm and leg. His speech is non-fluent but comprehension is intact.

(a) Identify the lobe involved and specify the area of motor speech if affected. (1 mark) (b) Describe the features of frontal lobe syndrome including motor, cognitive, and behavioral manifestations. (2 marks) (c) What is the significance of the pre-motor cortex and supplementary motor area in this context? (1 mark) (d) Name one structural cause in this age group that you must exclude. (1 mark)

12. Lobar Functions - Parietal and Occipital Lobes (5 marks)

(a) Describe Gerstmann's syndrome. Which cortical area produces it and which hemisphere is dominant for this? (2 marks) (b) A patient cannot recognize a familiar face but can describe individual facial features accurately. What is this condition called and which lobe is responsible? (1 mark) (c) Distinguish between a homonymous hemianopia caused by a temporal lobe lesion and one caused by an occipital lobe lesion, with reference to the visual field defect pattern. (2 marks)

13. Brain Stem Stroke Syndromes - Medullary and Midbrain (5 marks)

Complete the following table for two major brain stem stroke syndromes:

Feature	Lateral Medullary Syndrome (Wallenberg)	Weber's Syndrome (Midbrain)
Artery occluded
Ipsilateral findings
Contralateral findings
Distinguishing eye sign
Level of lesion

14. Applied Clinical Scenario (5 marks)

A 68-year-old hypertensive man presents acutely with sudden vertigo, vomiting, hiccups, hoarseness of voice, and dysphagia. On examination you find: right-sided Horner's syndrome, right-sided loss of pain and temperature over the face, left-sided loss of pain and temperature over the limbs (with preserved touch and vibration), right-sided limb ataxia, and an absent gag reflex on the right.

(a) Identify the syndrome and the most likely occluded vessel. (1 mark) (b) Explain the mechanism of the crossed sensory pattern using the relevant anatomical tracts. (2 marks) (c) Why is proprioception and vibration sense preserved? (1 mark) (d) What is the likely underlying etiology given his risk factors, and name one first-line investigation to confirm the vascular lesion? (1 mark)

SECTION C: Essay Question (10 marks)

15. Write a structured essay on the functional anatomy of the cerebral lobes as described in Davidson's, covering:

Frontal lobe: motor cortex, pre-motor cortex, Broca's area, prefrontal functions (2 marks)
Parietal lobe: primary somatosensory cortex, association areas, dominant vs non-dominant differences (2 marks)
Temporal lobe: Wernicke's area, memory (hippocampus), auditory cortex, and limbic connections (2 marks)
Occipital lobe: primary visual cortex, visual association areas, cortical blindness (2 marks)
Clinical application: using one clinical vignette to demonstrate how you would localize a cortical lesion from a given set of signs (2 marks)

ANSWER GUIDE (Abbreviated Key Points)

Section A Answers

Frontal (voluntary movement/personality), Parietal (somatosensory/spatial awareness), Temporal (language comprehension/memory), Occipital (vision)
Dominant temporal-parietal junction; angular gyrus syndrome / Gerstmann's or anomic aphasia
Broca's (frontal, inferior frontal gyrus) - non-fluent, good comprehension; Wernicke's (superior temporal gyrus) - fluent but meaningless speech, poor comprehension
Ipsilateral facial pain/temperature loss, contralateral limb pain/temperature loss, ipsilateral Horner's syndrome
Wallenberg (lateral medullary) syndrome; posterior inferior cerebellar artery (PICA) or vertebral artery
Ipsilateral cranial nerve LMN palsy + contralateral hemiplegia; brain stem (due to pyramidal decussation below the lesion)
Inability to attend to stimuli on the contralateral side; right parietal lobe (non-dominant hemisphere)
Ipsilateral pontine tegmentum (medial inferior pontine - Foville's syndrome involves all these elements)
Dominant: aphasia, apraxia, agraphia, acalculia; Non-dominant: neglect, constructional apraxia, dressing apraxia, anosognosia
Basilar artery (paramedian branches) / anterior inferior cerebellar artery for lateral pons; Millard-Gubler: ipsilateral LMN VII palsy, ipsilateral VI palsy, contralateral hemiplegia

Section B Key Points

Q11: (a) Frontal lobe; Broca's area (inferior frontal gyrus, dominant hemisphere). (b) Frontal syndrome: disinhibition, perseveration, grasp reflex, primitive reflexes, urinary incontinence, contralateral UMN signs if motor cortex involved, expressive aphasia if Broca's area involved. (c) Pre-motor and SMA coordinate complex/sequential movements and bilateral limb coordination. (d) Frontal meningioma, glioma, or metastasis.

Q12: (a) Gerstmann's: finger agnosia, acalculia, agraphia, right-left disorientation; dominant parietal lobe, angular gyrus. (b) Prosopagnosia; fusiform gyrus of occipito-temporal cortex. (c) Temporal lobe: superior quadrantanopia (Meyer's loop - "pie in the sky"); Occipital lobe: congruous homonymous hemianopia with macular sparing.

Q13:

Feature	Lateral Medullary (Wallenberg)	Weber's Syndrome
Artery	PICA or vertebral artery	Posterior cerebral artery (PCA) / basilar penetrators
Ipsilateral	Horner's, facial pain/temp loss, limb ataxia, IX/X palsy, nystagmus	CN III palsy (ptosis, mydriasis, eye down and out)
Contralateral	Limb pain/temperature loss	Hemiplegia (corticospinal tract)
Eye sign	Nystagmus, lateropulsion	Third nerve palsy with contralateral hemiplegia
Level	Lateral medulla	Midbrain (cerebral peduncle/CN III nucleus)

Q14: (a) Wallenberg syndrome (lateral medullary syndrome); right posterior inferior cerebellar artery (PICA) or right vertebral artery. (b) Ipsilateral facial loss: trigeminal nucleus/tract in the lateral medulla (before crossing). Contralateral limb loss: spinothalamic tract already crossed in the spinal cord, running in lateral medulla contralateral to body it serves. (c) Dorsal column-medial lemniscal pathway runs in the medial medulla, not the lateral medulla - so it is spared. (d) Atherothrombosis (hypertension is the main risk factor); MRI brain with DWI (diffusion-weighted imaging) is first-line.

Marking Notes for Instructors

Full marks for Section C require structured presentation with headings, accurate anatomical detail, and a coherent clinical application.
Diagrams are encouraged in Q13 and Q15 (coronal section showing tracts, visual pathway diagram).
Cross-referencing the Davidson's boxes on "Features of lobe lesions" and the table on "Focal brain stem syndromes" is expected for top marks.

Reference: Davidson's Principles and Practice of Medicine, 28th Edition - Chapter on Neurology: Cerebral Lobes (Functional Anatomy) and Cerebrovascular Disease (Brain Stem Stroke Syndromes)

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