📝 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 loses vibration and conscious proprioception on the right side below a spinal cord lesion. Pain and temperature are preserved. Which tract is most likely affected?

Options:
Right dorsal column
Left dorsal column
Right spinothalamic tract
Left spinothalamic tract
Anterior corticospinal tract

Correct Answer:
Right dorsal column

Explanation:
Dorsal column fibers ascend ipsilaterally in the spinal cord and cross in the medulla. Therefore, a right spinal cord lesion causes right-sided loss of vibration and proprioception below the lesion.

MCQ 2

Question:
A transverse section of spinal cord shows abundant white matter, large anterior horns, and posterior columns divided into fasciculus gracilis and cuneatus. Which spinal cord level is most likely represented?

Options:
Sacral segment
Lumbar segment
Thoracic segment
Cervical segment
Coccygeal segment

Correct Answer:
Cervical segment

Explanation:
Cervical cord has the maximum white matter because it contains fibers for most of the body. Fasciculus cuneatus is present above T6 and large anterior horns occur in cervical enlargement.

MCQ 3

Question:
Occlusion of the anterior spinal artery is most likely to impair which combination of functions?

Options:
Vibration sense and fine touch only
Pain, temperature, and motor function
Conscious proprioception only
Posterior column sensations only
Olfaction and visual reflexes

Correct Answer:
Pain, temperature, and motor function

Explanation:
The anterior spinal artery supplies the anterior two-thirds of the cord, including corticospinal and spinothalamic pathways. Posterior columns are usually spared.

MCQ 4

Question:
During development of the spinal cord, the alar plate mainly forms which adult structure?

Options:
Anterior horn
Posterior horn
Ventral root
Anterior median fissure
White commissure

Correct Answer:
Posterior horn

Explanation:
The alar plate is the dorsal sensory part of the neural tube and gives rise to sensory areas, especially the posterior horn.

MCQ 5

Question:
A spinal cord section shows a prominent lateral horn with relatively small anterior horns. Which functional neuronal group is most likely present in the lateral horn?

Options:
Somatic sensory neurons
Somatic motor neurons
Sympathetic preganglionic neurons
Parasympathetic postganglionic neurons
Dorsal root ganglion cells

Correct Answer:
Sympathetic preganglionic neurons

Explanation:
The lateral horn is prominent in thoracic and upper lumbar segments and contains sympathetic preganglionic neurons.

MCQ 6

Question:
A lesion of the left spinothalamic tract in the spinal cord will most likely cause which sensory deficit?

Options:
Left loss of vibration below lesion
Right loss of pain and temperature below lesion
Left loss of proprioception below lesion
Right loss of fine touch above lesion
Bilateral loss of motor power only

Correct Answer:
Right loss of pain and temperature below lesion

Explanation:
Spinothalamic fibers cross in the spinal cord through the anterior white commissure and then ascend contralaterally.

MCQ 7

Question:
Which feature best explains why cervical spinal cord has more white matter than sacral spinal cord?

Options:
Cervical cord has no grey matter
Sacral cord lacks sensory neurons
More ascending and descending fibers pass through cervical levels
Cervical cord contains only autonomic neurons
Sacral cord has no posterior columns

Correct Answer:
More ascending and descending fibers pass through cervical levels

Explanation:
Cervical levels contain long tracts carrying information to and from most of the body, so white matter is greatest at cervical levels.

MCQ 8

Question:
A patient has flaccid paralysis, muscle wasting, reduced reflexes, and fasciculations in muscles supplied by one spinal segment. Which structure is most likely damaged?

Options:
Posterior horn
Anterior horn
Posterior funiculus
Lateral funiculus
Dorsal root ganglion

Correct Answer:
Anterior horn

Explanation:
Anterior horn contains lower motor neurons. Damage produces lower motor neuron signs such as flaccidity, wasting, fasciculations, and reduced reflexes.

MCQ 9

Question:
The central canal of the adult spinal cord is developmentally derived from which embryological structure?

Options:
Neural tube cavity
Notochord canal
Somitic cavity
Primitive streak
Neural crest space

Correct Answer:
Neural tube cavity

Explanation:
The cavity of the neural tube persists as the central canal of the spinal cord and ventricular system in the brain.

MCQ 10

Question:
A student identifies a spinal cord slide by observing central butterfly-shaped grey matter surrounded by pale peripheral white matter. Which structure-function relationship is most accurate?

Options:
Grey matter mainly conducts long tracts
White matter mainly contains neuronal cell bodies
Grey matter mainly processes synaptic activity
White matter mainly produces cerebrospinal fluid
Central canal mainly forms dorsal roots

Correct Answer:
Grey matter mainly processes synaptic activity

Explanation:
Grey matter contains neuronal cell bodies, dendrites, synapses, and glial cells, making it the main processing region of the spinal cord.

MCQ 11

Question:
A lesion damages the lower medullary pyramidal decussation. Which pathway is most directly affected at its crossing point?

Options:
Spinothalamic tract
Dorsal column fibers
Corticospinal tract
Vestibulospinal tract
Tectospinal tract

Correct Answer:
Corticospinal tract

Explanation:
Most corticospinal fibers cross in the pyramidal decussation in the lower medulla before descending as the lateral corticospinal tract.

MCQ 12

Question:
Which clinical finding is most consistent with damage to the dorsal column–medial lemniscal system?

Options:
Loss of crude pain only
Loss of vibration and position sense
Loss of voluntary facial movement
Loss of sweating only
Loss of pupillary reflex only

Correct Answer:
Loss of vibration and position sense

Explanation:
The dorsal column–medial lemniscal pathway carries vibration, conscious proprioception, fine touch, and two-point discrimination.

MCQ 13

Question:
Which spinal cord level is most likely identified by a thin rim of white matter and proportionally large grey matter?

Options:
Cervical level
Upper thoracic level
Mid-thoracic level
Lumbar enlargement
Sacral level

Correct Answer:
Sacral level

Explanation:
Sacral cord has less white matter because many ascending and descending fibers have already entered or terminated at higher levels.

MCQ 14

Question:
A spinal cord lesion produces ipsilateral upper motor neuron weakness and ipsilateral loss of conscious proprioception below the lesion, with contralateral loss of pain and temperature. Which condition best explains this pattern?

Options:
Anterior cord syndrome
Posterior cord syndrome
Central cord syndrome
Brown-Séquard syndrome
Cauda equina syndrome

Correct Answer:
Brown-Séquard syndrome

Explanation:
Hemisection of the cord damages ipsilateral corticospinal and dorsal column pathways and contralateral spinothalamic pathway below the lesion.

MCQ 15

Question:
Which Rexed laminae are most closely related to motor neurons in the anterior horn?

Options:
Laminae I–II
Laminae III–IV
Laminae V–VI
Lamina VII only
Laminae VIII–IX

Correct Answer:
Laminae VIII–IX

Explanation:
Laminae VIII and IX are located in the anterior horn region and are mainly associated with motor neuronal activity.

MCQ 16

Question:
A student confuses a spinal cord transverse section with a peripheral nerve section. Which feature most strongly supports identification as spinal cord?

Options:
Parallel nerve fibers in bundles
Central H-shaped grey matter
Prominent connective tissue septa
Multiple fascicles with perineurium
Endoneurium around axons

Correct Answer:
Central H-shaped grey matter

Explanation:
Spinal cord is recognized by central butterfly-shaped grey matter, peripheral white matter, and central canal. Peripheral nerve shows fascicles and connective tissue coverings.

MCQ 17

Question:
Which tract is most directly responsible for maintaining posture, tone, balance, and automatic motor control?

Options:
Dorsal column tract
Spinothalamic tract
Corticospinal tract
Extrapyramidal tract
Medial lemniscus

Correct Answer:
Extrapyramidal tract

Explanation:
Extrapyramidal pathways such as vestibulospinal and reticulospinal tracts regulate posture, muscle tone, balance, and automatic movements.

MCQ 18

Question:
A mother with poor folic acid intake during early pregnancy has an infant with a neural tube defect involving the spinal region. Which developmental process most likely failed?

Options:
Closure of neural tube
Formation of limb buds
Rotation of midgut
Fusion of palatal shelves
Septation of heart tube

Correct Answer:
Closure of neural tube

Explanation:
Spina bifida and related defects result from failure of neural tube closure. Folic acid deficiency increases the risk.

MCQ 19

Question:
Which pathway arrangement correctly matches modality with crossing level?

Options:
Dorsal column — spinal cord crossing
Spinothalamic tract — medullary crossing
Corticospinal tract — medullary crossing
Vestibulospinal tract — thalamic crossing
Tectospinal tract — dorsal root crossing

Correct Answer:
Corticospinal tract — medullary crossing

Explanation:
Most corticospinal fibers cross in the pyramidal decussation of the lower medulla. Dorsal column fibers also cross in the medulla, while spinothalamic fibers cross in the spinal cord.

MCQ 20

Question:
A lesion affecting the internal vertebral venous plexus is clinically important because this venous system has which feature?

Options:
It drains only cervical cord
It contains arterial valves
It communicates through valveless channels
It supplies anterior horn cells
It forms cerebrospinal fluid

Correct Answer:
It communicates through valveless channels

Explanation:
The internal vertebral venous plexus is valveless, allowing spread of infection or malignancy to the vertebral canal depending on pressure changes.

📌 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.