Applied Neuroanatomy — MCQs
A 68-year-old patient presents with sudden onset of right-sided weakness and slurred speech. The symptoms completely resolve within 30 minutes with no residual neurological deficits. This clinical presentation is most consistent with:
Superior temporal gyrus lesion leads to?
A patient presented with ipsilateral Horner's syndrome, ipsilateral loss of pain and temperature sensations in the face, vertigo with numbness and loss of sweating and dysarthria on the contralateral side. All these symptoms are caused due to a lesion in:
What is the primary symptom associated with a lesion in Wernicke's area?
Bleeding as shown in the image is due to which of the following vessels?
What are the effects of a lesion in Brodmann area 22?
Regarding brown sequard syndrome following are true statements except
Which of the following is not a component of Brown-Sequard syndrome?
Which of the following nuclei of the vagus receives special and general visceral afferents?
Inferior cerebellar peduncle has all of the following tracts, except which one?
Applied Neuroanatomy Indian Medical PG Practice Questions and MCQs
Question 1: A 68-year-old patient presents with sudden onset of right-sided weakness and slurred speech. The symptoms completely resolve within 30 minutes with no residual neurological deficits. This clinical presentation is most consistent with:
- A. Transient Ischemic Attack (TIA) (Correct Answer)
- B. Subarachnoid hemorrhage
- C. Intracerebral hemorrhage
- D. Ischemic stroke
Explanation: ***Transient Ischemic Attack (TIA)*** - A TIA is characterized by **transient neurological dysfunction caused by focal brain, spinal cord, or retinal ischemia**, without acute infarction [1]. - The key diagnostic feature here is the **complete resolution of symptoms within a short period** (30 minutes) with no residual deficits, fitting the definition of TIA [1]. *Subarachnoid hemorrhage* - This typically presents with a **sudden, severe headache** (often described as "thunderclap"), stiff neck, and altered mental status. - While it can cause sudden neurological deficits, these symptoms usually **do not resolve completely within minutes**, and often lead to persistent deficits or life-threatening complications. *Intracerebral hemorrhage* - An intracerebral hemorrhage involves **bleeding directly into the brain tissue**, leading to sudden onset of neurological deficits that **progress over time** [2]. - The symptoms are generally **severe and persistent**, and would not resolve completely within 30 minutes. *Ischemic stroke* - An ischemic stroke is caused by a **blockage of blood flow to the brain**, resulting in brain tissue damage (infarction) and persistent neurological deficits [2]. - While initial symptoms can be similar to a TIA [3], an ischemic stroke by definition involves **permanent damage and lasting deficits**, unlike what is described in the patient's presentation.
Question 2: Superior temporal gyrus lesion leads to?
- A. Anomic aphasia
- B. Broca's aphasia
- C. Wernicke's aphasia (Correct Answer)
- D. Non-fluent aphasia
Explanation: ***Wernicke's aphasia*** - A lesion in the **superior temporal gyrus** (Wernicke's area) leads to Wernicke's aphasia, characterized by impaired **comprehension of language** [1]. - Patients with Wernicke's aphasia exhibit **fluent but meaningless speech** (word salad) and are often unaware of their deficits [1]. *Anomic aphasia* - Characterized by difficulty finding words, particularly nouns and verbs, and is often associated with lesions in the **angular gyrus** or **temporal lobe** [1]. - Speech remains fluent and grammatically correct, but it is marked by frequent pauses and circumlocutions as the individual struggles to retrieve specific words. *Broca's aphasia* - Results from damage to **Broca's area** in the posterior inferior frontal gyrus, causing **non-fluent speech** and difficulty with speech production [1]. - While comprehension is relatively preserved, patients struggle to form complete sentences and may exhibit agrammatism. *Non-fluent aphasia* - A broad category of aphasias, including Broca's aphasia, where speech production is notably impaired, and the output is effortful and characterized by **agrammatism** and **short, telegraphic sentences**. - **Wernicke's aphasia** is typically considered a **fluent aphasia**, as speech production itself is not interrupted, though its content is often incomprehensible [1].
Question 3: A patient presented with ipsilateral Horner's syndrome, ipsilateral loss of pain and temperature sensations in the face, vertigo with numbness and loss of sweating and dysarthria on the contralateral side. All these symptoms are caused due to a lesion in:
- A. A and B
- B. B and D (Correct Answer)
- C. B, C, D
- D. A, B, C
Explanation: ***B and D*** - This complex of symptoms, including ipsilateral **Horner's syndrome**, ipsilateral facial **pain and temperature loss**, **vertigo**, and contralateral **pain and temperature loss** on the body, is characteristic of **Wallenberg syndrome**, also known as **lateral medullary syndrome**. - Wallenberg syndrome is caused by an infarction in the **vertebral artery** (dorsal portion) or its branch, the **posterior inferior cerebellar artery (PICA)**, which supplies the lateral medulla. *A and B* - This option refers to lesions in the **medial medulla**, which would present with completely different symptoms such as contralateral **hemiplegia**, contralateral **loss of proprioception**, and ipsilateral **tongue deviation**. - While both medulla, the distinct clinical presentations differentiate **medial from lateral medullary lesions**. *B, C, D* - This combination attempts to incorporate a lesion in the **medial medulla** (C) with the other relevant areas. - However, the symptom complex clearly points to **lateral medullary involvement**, and including the medial medulla would suggest a different or more extensive stroke. *A, B, C* - This option includes the **anterior spinal artery**, which primarily supplies the **medial medulla** and spinal cord, leading to distinct symptoms. - Involvement of the **anterior spinal artery** would result in motor deficits and loss of pain/temperature on the contralateral side, but would not typically cause **Horner's syndrome** or the intense **vertigo** seen in lateral medullary syndrome.
Question 4: What is the primary symptom associated with a lesion in Wernicke's area?
- A. Inability to understand language
- B. Inability to repeat phrases
- C. Fluent speech with poor comprehension (Correct Answer)
- D. Difficulty in forming sentences
Explanation: ***Fluent speech with poor comprehension*** - A lesion in **Wernicke's area** results in **Wernicke's aphasia**, where the individual can produce speech fluently but the content is often meaningless or nonsensical (word salad). [1] - The primary characteristic is a profound **difficulty in understanding** spoken and written language, despite intact hearing and vision. *Inability to understand language* - While an inability to understand language is a key component of Wernicke's aphasia, the description "fluent speech with poor comprehension" more comprehensively captures the clinical presentation by including the intact though often chaotic speech production. - This option alone does not fully encompass the unique **dissociation between fluency and comprehension** seen in Wernicke's aphasia. *Inability to repeat phrases* - The **inability to repeat phrases** is typically associated with **conduction aphasia**, which results from damage to the **arcuate fasciculus**, the connection between Wernicke's and Broca's areas. [1] - While repetition can be impaired in Wernicke's aphasia due to poor comprehension, it is not the primary defining symptom differentiating it from other aphasias. *Difficulty in forming sentences* - **Difficulty in forming sentences** and producing meaningful speech, often characterized by **non-fluent, effortful speech** and agrammatism, is a hallmark of **Broca's aphasia**. [1] - Broca's area is responsible for **speech production** and grammatical structure, not language comprehension.
Question 5: Bleeding as shown in the image is due to which of the following vessels?
- A. Lenticulostriate artery
- B. Vertebral artery
- C. Bridging veins (Correct Answer)
- D. Middle meningeal artery
Explanation: ***Bridging veins*** - The image depicts a **subdural hemorrhage (subdural hematoma)**, a collection of blood between the dura mater and the arachnoid mater, typically appearing as a **crescent-shaped** hyperdensity that conforms to the brain surface. - This type of hemorrhage is caused by the tearing of **bridging veins** that traverse the subdural space, connecting the cerebral cortex to the dural venous sinuses. - Tearing of these veins occurs due to rapid acceleration-deceleration forces causing the brain to move relative to the dura, stretching and rupturing the veins. This is common in **head trauma**, especially in the elderly (due to brain atrophy increasing vein vulnerability) or infants. *Lenticulostriate artery* - Rupture of the lenticulostriate arteries (perforating branches of the middle cerebral artery) typically leads to **intraparenchymal hemorrhage**, specifically in the basal ganglia or internal capsule. - This type of bleeding is confined within the brain parenchyma, rather than collecting in the subdural space as seen in the image. - Associated with hypertensive hemorrhage. *Vertebral artery* - The vertebral arteries supply the posterior circulation of the brain, and their rupture can lead to **subarachnoid hemorrhage** (if a posterior circulation aneurysm ruptures) or **intraparenchymal bleeding** in the brainstem or cerebellum. - Bleeding from the vertebral artery is not associated with the subdural collection pattern shown in the image. *Middle meningeal artery* - The middle meningeal artery runs in the epidural space, and its rupture (often due to temporal bone fracture) causes an **epidural hematoma**. - An epidural hematoma is characterized by a **biconvex (lentiform) shape** on imaging and is situated between the dura mater and the skull, which is distinct from the **crescent-shaped** subdural collection shown. - Does not cross suture lines, unlike subdural hematomas which can extend over multiple lobes.
Question 6: What are the effects of a lesion in Brodmann area 22?
- A. Expressive aphasia
- B. Receptive aphasia (Correct Answer)
- C. Poor repetition of language
- D. Poor naming
Explanation: ***Receptive aphasia*** - A lesion in **Brodmann area 22**, specifically in **Wernicke's area**, leads to **receptive aphasia** (Wernicke's aphasia). - This condition is characterized by **impaired comprehension** of spoken and written language, **fluent but paraphasic speech**, and **poor repetition**. - This is the most comprehensive answer as it describes the entire clinical syndrome. *Expressive aphasia* - **Brodmann areas 44 and 45** (Broca's area) in the frontal lobe are associated with expressive aphasia (Broca's aphasia). - Patients have good comprehension but struggle to produce fluent speech, with effortful, telegraphic output. *Poor repetition of language* - While poor repetition is indeed a feature of Wernicke's aphasia, this option describes only one component of the syndrome rather than the complete clinical picture. - **Conduction aphasia** (from arcuate fasciculus lesions) is characterized by poor repetition with **relatively preserved** comprehension and fluent speech, distinguishing it from Wernicke's aphasia. - "Receptive aphasia" is the more complete answer. *Poor naming* - Difficulty with naming, or **anomia**, is a common feature across various types of aphasia, including both receptive and expressive aphasia. - It reflects disruption in language networks involving the **temporal and parietal lobes** but is not specific to Brodmann area 22 lesions.
Question 7: Regarding brown sequard syndrome following are true statements except
- A. Ipsilateral loss of pain and temperature below the level of lesion (Correct Answer)
- B. Ipsilateral spastic paralysis below the lesion
- C. Ipsilateral loss of conscious proprioception, vibration sensation at the level and below the level of lesion.
- D. Ipsilateral flaccid paralysis at the level of lesion
Explanation: ***Ipsilateral loss of pain and temperature below the level of lesion*** - In Brown-Séquard syndrome, the **spinothalamic tract** decussates at the spinal cord level. Therefore, a lesion on one side of the spinal cord will cause **contralateral loss of pain and temperature** below the level of the lesion [1], [2]. - An ipsilateral loss of pain and temperature below the lesion would imply an unusual or additional injury mechanism, making this statement incorrect in the context of a classic Brown-Séquard presentation. *Ipsilateral spastic paralysis below the lesion* - The **corticospinal tract**, responsible for voluntary motor control, descends ipsilaterally before decussating in the medulla. - A lesion in the spinal cord thus causes **ipsilateral motor weakness or paralysis** below the level of the lesion, often spastic due to upper motor neuron involvement [1]. *Ipsilateral loss of conscious proprioception, vibration sensation at the level and below the level of lesion.* - The **dorsal columns**, which carry conscious proprioception and vibration sensation, ascend ipsilaterally in the spinal cord [2]. - Therefore, a hemi-section of the cord will result in **ipsilateral loss** of these sensations at and below the lesion [1]. *Ipsilateral flaccid paralysis at the level of lesion* - At the level of the lesion, the **lower motor neurons (LMNs)** in the anterior horn are directly affected [3]. - This leads to **flaccid paralysis** and hyporeflexia in the muscles innervated by the damaged segment [3].
Question 8: Which of the following is not a component of Brown-Sequard syndrome?
- A. Contralateral loss of pain and temperature sensation
- B. Contralateral posterior column involvement (Correct Answer)
- C. Ipsilateral extensor plantar response
- D. Ipsilateral loss of proprioception
Explanation: ***Contralateral posterior column involvement*** - **Brown-Séquard syndrome** is caused by hemisection of the spinal cord, affecting pathways as they ascend or descend. [1] - The **posterior columns** (involved in proprioception, vibration, and fine touch) transmit sensory information **ipsilaterally**, meaning symptoms would be on the same side as the lesion, not contralateral. [1] *Ipsilateral extensor plantar response* - This is a feature of **upper motor neuron (UMN) damage** affecting the corticospinal tract, which descends ipsilaterally before crossing in the medulla. - In Brown-Séquard syndrome, the **ipsilateral corticospinal tract** is damaged, leading to UMN signs below the lesion. [1] *Ipsilateral loss of proprioception* - **Proprioception** is carried by the posterior columns, which ascend **ipsilaterally** in the spinal cord. [2] - Damage to the posterior column on one side of the spinal cord (as in a hemisection) results in **ipsilateral loss** of proprioception, vibration, and discriminative touch. [1] *Contralateral loss of pain and temperature sensation* - The **spinothalamic tracts** carry pain and temperature sensations and cross within one or two spinal cord segments after entering. [2] - Therefore, a lesion on one side of the spinal cord will result in **contralateral loss** of pain and temperature sensation, typically a few segments below the level of the lesion. [1]
Question 9: Which of the following nuclei of the vagus receives special and general visceral afferents?
- A. Nucleus of Solitary Tract (Correct Answer)
- B. Dorsal Nucleus of Vagus
- C. Nucleus Ambiguous
- D. Spinal nucleus of trigeminal nerve
Explanation: ### Nucleus of Solitary Tract - The **nucleus of the solitary tract** (NST) is the primary sensory nucleus for **general visceral afferents** (GVA) and **special visceral afferents** (SVA) from the vagus nerve (CN X) [1], [2]. - It receives taste sensation from the **epiglottis** and upper esophagus (SVA) and general sensation from the pharynx, larynx, and thoracic/abdominal viscera (GVA) [1], [2]. *Dorsal Nucleus of Vagus* - The **dorsal nucleus of the vagus** is primarily an **efferent (motor)** nucleus, providing **preganglionic parasympathetic innervation** to thoracic and abdominal viscera. - While it plays a role in visceral function, it is not the primary recipient of **afferent sensory information** from the vagus nerve. *Nucleus Ambiguous* - The **nucleus ambiguous** is a **motor nucleus** that provides **branchiomotor innervation** to muscles of the pharynx and larynx via the vagus nerve. - It is involved in processes like swallowing and speech, but it does **not receive visceral afferent input**. *Spinal nucleus of trigeminal nerve* - The **spinal nucleus of the trigeminal nerve** processes **pain and temperature sensation** for the face and oral cavity, primarily from the trigeminal nerve (CN V). - It is **not associated with the vagus nerve's visceral afferent functions**.
Question 10: Inferior cerebellar peduncle has all of the following tracts, except which one?
- A. Olivocerebellar
- B. Spinocerebellar
- C. Pontocerebellar (Correct Answer)
- D. Vestibulocerebellar
Explanation: ***Pontocerebellar*** - The **pontocerebellar tracts** originate from the **pontine nuclei** and project to the contralateral cerebellum exclusively through the **middle cerebellar peduncle** (NOT the inferior cerebellar peduncle). - These tracts are crucial for carrying information about voluntary movements initiated by the cerebral cortex to the cerebellum for motor coordination. - The middle cerebellar peduncle is the largest cerebellar peduncle and consists almost entirely of pontocerebellar fibers. *Olivocerebellar* - The **olivocerebellar tracts** originate from the **inferior olivary nucleus** and pass through the **inferior cerebellar peduncle** to reach the contralateral cerebellar cortex [1]. - These fibers are crucial for motor learning, coordination, and error correction [1]. *Spinocerebellar* - The **posterior spinocerebellar tract** is a major component of the **inferior cerebellar peduncle**, conveying **unconscious proprioception** from the lower limb and lower trunk [1]. - This information helps the cerebellum coordinate posture and movement [1]. *Vestibulocerebellar* - **Vestibulocerebellar tracts** transmit essential information from the **vestibular nuclei** and organs to the cerebellum through the **inferior cerebellar peduncle** [1]. - These fibers contribute to balance, posture, and vestibulo-ocular reflexes [1].
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