📝 Step 5 — KMU Past Papers & Exam Learning
This section contains KMU-style past paper questions designed to strengthen conceptual understanding. Focus on understanding explanations rather than memorizing answers.
🎯 How to Study KMU Past Papers
- Read the question carefully.
- Think about the answer before looking.
- Read the explanation slowly.
- Understand the reasoning behind the correct answer.
- Revise difficult questions again.
MCQ 1
Question:
A patient has weakness of the right lower limb more than the face after a small cortical lesion near the medial surface of the hemisphere. Which cortical territory is most likely involved?
Options:
Inferior temporal gyrus
Lateral occipital cortex
Paracentral lobule
Superior temporal gyrus
Inferior frontal gyrus
Correct Answer:
Paracentral lobule
Explanation:
The lower limb area of the motor cortex lies mainly on the medial surface in the paracentral lobule. A medial cortical lesion therefore affects the contralateral leg more prominently.
MCQ 2
Question:
A student identifies a deep cortical region hidden within the lateral sulcus during brain dissection. Which lobe is being observed?
Options:
Insular lobe
Occipital lobe
Parietal lobe
Frontal lobe
Temporal lobe
Correct Answer:
Insular lobe
Explanation:
The insula lies deep within the lateral sulcus and is covered by parts of the frontal, parietal, and temporal opercula.
MCQ 3
Question:
A cortical lesion around the calcarine sulcus is most likely to affect which function?
Options:
Voluntary speech output
Auditory discrimination
Somatic sensation
Taste perception
Visual processing
Correct Answer:
Visual processing
Explanation:
The primary visual cortex is located along the margins of the calcarine sulcus on the medial surface of the occipital lobe.
MCQ 4
Question:
A lesion damages fibers that connect Broca area with Wernicke area in the same cerebral hemisphere. Which fiber group is mainly involved?
Options:
Projection fibers
Association fibers
Commissural fibers
Thalamocortical fibers
Corticospinal fibers
Correct Answer:
Association fibers
Explanation:
Association fibers connect different cortical areas within the same hemisphere. Language integration depends on such intrahemispheric connections.
MCQ 5
Question:
A small infarct in the internal capsule causes marked contralateral weakness. Which anatomical feature best explains the severity?
Options:
Large cortical surface area
Bilateral callosal crossing
Loose fiber arrangement
Compact projection fibers
Multiple ventricular borders
Correct Answer:
Compact projection fibers
Explanation:
Projection fibers are densely packed in the internal capsule. A small lesion can interrupt many descending motor fibers simultaneously.
MCQ 6
Question:
A patient can recognize an object with the right hand but cannot verbally name it when visual input is restricted. A callosal lesion is suspected. Which structure is most likely damaged?
Options:
Splenium of corpus callosum
Anterior limb of internal capsule
Medial geniculate body
Ventral posterior nucleus
Lateral hypothalamic area
Correct Answer:
Splenium of corpus callosum
Explanation:
Posterior callosal fibers, especially through the splenium, help transfer sensory and visual information between hemispheres for integrated interpretation.
MCQ 7
Question:
A lesion affecting the genu of the corpus callosum would most directly disturb communication between which cortical regions?
Options:
Occipital association areas
Temporal auditory areas
Primary visual cortices
Parietal sensory areas
Frontal cortical areas
Correct Answer:
Frontal cortical areas
Explanation:
The genu of the corpus callosum mainly carries fibers connecting frontal regions of the two cerebral hemispheres.
MCQ 8
Question:
A thalamic lesion causes loss of fine touch, pain, and proprioception from the opposite side of the body. Which functional role of the thalamus is affected?
Options:
Endocrine regulation
Circadian timing
Somatic sensory relay
Speech motor planning
Cerebellar foliation
Correct Answer:
Somatic sensory relay
Explanation:
Somatic sensory information from the body is relayed through thalamic nuclei before reaching the somatosensory cortex.
MCQ 9
Question:
A lesion in the thalamus affects motor planning by interrupting signals from cerebellar and basal nuclear circuits to the cortex. Which nuclear group is most relevant?
Options:
Anterior nuclear group
Ventral nuclear group
Medial geniculate group
Lateral geniculate group
Pulvinar group
Correct Answer:
Ventral nuclear group
Explanation:
Ventral anterior and ventral lateral thalamic nuclei participate in motor circuits connecting basal nuclei and cerebellum with motor cortical areas.
MCQ 10
Question:
A patient develops impaired memory-related limbic function after damage to a thalamic nucleus. Which nucleus is most classically associated with limbic circuitry?
Options:
Lateral geniculate body
Medial geniculate body
Ventral posterior nucleus
Anterior nucleus
Pulvinar
Correct Answer:
Anterior nucleus
Explanation:
The anterior thalamic nucleus is related to limbic pathways and memory circuits, especially through connections with mammillary bodies and cingulate cortex.
MCQ 11
Question:
A lesion near the hypothalamic region causes marked hyperphagia and weight gain. Which area is most likely damaged?
Options:
Ventromedial nucleus
Medial geniculate body
Pulvinar nucleus
Precentral gyrus
Calcarine cortex
Correct Answer:
Ventromedial nucleus
Explanation:
The ventromedial hypothalamic nucleus is associated with satiety. Its damage may lead to increased feeding and weight gain.
MCQ 12
Question:
A patient has reduced feeding behavior after damage to an appetite-related hypothalamic area. Which region is most likely affected?
Options:
Posterior hypothalamus
Anterior hypothalamus
Lateral hypothalamic area
Supraoptic nucleus
Subthalamic nucleus
Correct Answer:
Lateral hypothalamic area
Explanation:
The lateral hypothalamic area is linked with hunger and feeding behavior. Its damage may reduce food intake.
MCQ 13
Question:
A lesion in the posterior hypothalamic region is most likely to impair which response?
Options:
Hearing relay
Visual relay
Interhemispheric transfer
Cortical speech output
Heat conservation response
Correct Answer:
Heat conservation response
Explanation:
The posterior hypothalamus is involved in heat conservation mechanisms such as sympathetic responses and shivering-related regulation.
MCQ 14
Question:
A patient develops diabetes insipidus after injury near the hypothalamo-hypophyseal tract. Which hormone pathway is most directly affected?
Options:
Thyroxine release from thyroid gland
Antidiuretic hormone release from posterior pituitary
Cortisol release from adrenal cortex
Insulin release from pancreatic islets
Melatonin release from pineal gland
Correct Answer:
Antidiuretic hormone release from posterior pituitary
Explanation:
ADH is produced mainly by hypothalamic nuclei and released from the posterior pituitary. Disruption causes polyuria and polydipsia.
MCQ 15
Question:
On histological examination, a cortical area shows a very thick internal granular layer. Which functional area is most likely represented?
Options:
Primary motor cortex
Premotor cortex
Motor speech area
Primary sensory cortex
Prefrontal cortex
Correct Answer:
Primary sensory cortex
Explanation:
Sensory cortex has a prominent granular layer because thalamocortical sensory inputs terminate mainly in layer IV.
MCQ 16
Question:
A slide shows large pyramidal neurons in the fifth cortical layer. Which pathway is most closely related to these cells?
Options:
Descending motor pathway
Olfactory mucosal pathway
Retinal photoreceptor pathway
Cochlear hair cell pathway
Hypophyseal portal pathway
Correct Answer:
Descending motor pathway
Explanation:
Layer V contains large pyramidal neurons, especially in motor cortex, and gives rise to major descending motor fibers.
MCQ 17
Question:
A histology slide of cerebral cortex is confused with cerebellar cortex. Which feature supports identification as cerebral cortex?
Options:
Single Purkinje cell row
Outer molecular and inner granular pattern
Folial branching with arbor vitae
Three-layered cortical organization
Six-layered laminated grey matter
Correct Answer:
Six-layered laminated grey matter
Explanation:
Typical neocortex has six layers, unlike cerebellar cortex, which has molecular, Purkinje, and granular layers.
MCQ 18
Question:
A cortical area receives abundant thalamic input and shows many small densely packed neurons. Which cell type is mainly responsible for this appearance?
Options:
Betz cells
Horizontal cells
Granule cells
Purkinje cells
Anterior horn cells
Correct Answer:
Granule cells
Explanation:
Granule cells are small neurons involved in receiving and processing input, especially in sensory cortical areas.
MCQ 19
Question:
A patient has loss of coordinated information transfer between the two hemispheres, but corticospinal strength is preserved. Which fiber system is primarily affected?
Options:
Projection system
Commissural system
Association system
Reticular system
Spinothalamic system
Correct Answer:
Commissural system
Explanation:
Commissural fibers connect the two cerebral hemispheres. Their injury causes interhemispheric disconnection without necessarily damaging descending motor tracts.
MCQ 20
Question:
A lesion damages the parieto-occipital region on the medial surface. Which anatomical landmark is most relevant for separating the involved lobes?
Options:
Central sulcus
Lateral sulcus
Cingulate sulcus
Parieto-occipital sulcus
Collateral sulcus
Correct Answer:
Parieto-occipital sulcus
Explanation:
The parieto-occipital sulcus is an important medial surface landmark separating parietal and occipital regions.
📌 Important Exam Strategy
KMU examinations often test integrated understanding rather than isolated facts. Focus on linking anatomy, embryology, histology, and clinical concepts when reviewing questions.
✅ Revision Tip
If you can explain the reason behind the correct answer without looking at notes, your concept is strong.