Brain and Neuroanatomy Practice Questions

Q: A 25-year-old male involved in a road traffic accident presents to the emergency department. On examination, he is moaning and unable to speak, but he can understand spoken language. Which of the following areas of the brain is most likely involved?

Area B. ***Area B*** - **Broca's area** (located in the **inferior frontal gyrus**, Brodmann areas 44/45) controls **motor speech production** and when damaged causes **expressive aphasia** with preserved comprehension. - The patient's ability to understand spoken language but inability to speak coherently is classic for **Broca's aphasia**, commonly seen in traumatic brain injuries affecting the dominant hemisphere. *Area A* - This area does not correspond to regions involved in **speech production** or **language comprehension**. - Damage here would not produce the specific pattern of **preserved comprehension** with **impaired speech output** seen in this case. *Area C* - Likely represents **Wernicke's area** in the **superior temporal gyrus**, which when damaged causes **receptive aphasia** with fluent but nonsensical speech. - Patients with **Wernicke's aphasia** have **impaired comprehension** but can produce fluent speech, opposite to this patient's presentation. *Area D* - This area does not correspond to primary **language centers** responsible for speech production or comprehension. - Damage here would not result in the characteristic **motor aphasia** pattern of intact understanding but inability to express speech.

Q: All of the following arteries supply the medulla oblongata, except?

Anterior inferior cerebellar artery. ### Explanation The blood supply to the **medulla oblongata** is derived primarily from the branches of the **vertebral arteries** and the **basilar artery**. **Why C is the correct answer:** The **Anterior Inferior Cerebellar Artery (AICA)** is a branch of the lower part of the **Basilar artery**. It primarily supplies the **Pons** (specifically the inferolateral part) and the anterior part of the cerebellum. It does not contribute to the blood supply of the medulla. **Analysis of incorrect options:** * **Posterior Inferior Cerebellar Artery (PICA):** A major branch of the vertebral artery. It supplies the **postero-lateral part** of the medulla. Occlusion of PICA leads to Lateral Medullary Syndrome (Wallenberg Syndrome). * **Anterior Spinal Artery:** Formed by the union of branches from both vertebral arteries. It supplies the **paramedian (medial) region** of the medulla. Occlusion leads to Medial Medullary Syndrome (Dejerine Syndrome). * **Vertebral Artery:** Direct branches (bulbar branches) from the vertebral artery supply the **lateral part** of the medulla. **NEET-PG High-Yield Pearls:** 1. **Medial Medullary Syndrome:** Caused by occlusion of the **Anterior Spinal Artery**. Key features include contralateral hemiparesis (pyramid), contralateral loss of vibration/proprioception (medial lemniscus), and ipsilateral tongue deviation (hypoglossal nerve). 2. **Lateral Medullary (Wallenberg) Syndrome:** Caused by occlusion of **PICA** or the vertebral artery. Key features include ipsilateral Horner’s syndrome, ataxia, and crossed sensory loss (ipsilateral face, contralateral body). 3. **Rule of Thumb:** AICA is to the **Pons** what PICA is to the **Medulla**.

Q: The medial geniculate body is an eminence on the inferior surface of the thalamus lateral to the midbrain. Which of the following functions is related to the medial geniculate body?

Hearing. The **Medial Geniculate Body (MGB)** is a specialized nucleus of the thalamus that serves as the **obligatory subcortical relay station for the auditory pathway** [1]. It receives auditory information from the inferior colliculus via the brachium of the inferior colliculus and projects it to the primary auditory cortex (Heschl’s gyri, Brodmann areas 41 and 42) in the temporal lobe. **Analysis of Options:** * **B. Hearing (Correct):** The MGB is the "thalamic relay" for hearing [1]. A common mnemonic to remember this is **"M is for Music"** (Medial = Music/Hearing). * **A. Vision:** Visual information is relayed through the **Lateral Geniculate Body (LGB)** [1]. Mnemonic: **"L is for Light"** (Lateral = Light/Vision). * **C. Balance:** Vestibular (balance) information primarily relays through the vestibular nuclei in the brainstem and the ventral posterior nucleus of the thalamus, not the MGB. * **D. Smell:** Olfaction is unique because it is the only sensory modality that reaches the cerebral cortex (olfactory cortex) without necessarily relaying through the thalamus first. **High-Yield NEET-PG Pearls:** 1. **The Auditory Pathway (E-COLI):** **E**ighth nerve → **C**ochlear nuclei → **O**livary complex (Superior) → **L**ateral lemniscus → **I**nferior colliculus → **MGB** → Auditory Cortex [1]. 2. **Metathalamus:** The MGB and LGB together constitute the metathalamus. 3. **Connections:** The MGB is connected to the **Inferior Colliculus**, while the LGB is connected to the **Superior Colliculus** [1].

Q: Which of the following is NOT a terminal branch of the internal carotid artery?

Cavernous artery. ### Explanation The **Internal Carotid Artery (ICA)** is a major vessel supplying the brain [1]. To answer this question, one must distinguish between the **branches** of the ICA and its final **terminal bifurcation**. **Why "Cavernous Artery" is the correct answer:** The ICA is divided into four segments: Cervical, Petrous, Cavernous, and Cerebral. The **Cavernous artery** (often referring to the *meningohypophyseal trunk* or *inferolateral trunk*) arises from the **cavernous (C3) segment** of the ICA while it is still within the cavernous sinus. It is a side branch, not a terminal branch. The ICA only terminates once it pierces the dura mater and reaches the base of the brain. **Analysis of Incorrect Options:** * **A & B (Anterior and Middle Cerebral Arteries):** These are the two **true terminal branches** of the ICA. The ICA ends at the level of the anterior perforated substance by bifurcating into the smaller ACA and the larger MCA. * **C (Posterior Communicating Artery):** While technically a branch of the **cerebral (C4) segment**, it arises just before the terminal bifurcation. In many clinical contexts and exam patterns, it is grouped with the distal branches of the ICA that contribute to the Circle of Willis [1]. However, compared to the cavernous artery (which is proximal and non-terminal), it is not the "least" terminal. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for ICA branches:** "**A P**oint **O**f **M**aximum **A**ccuracy" (**A**nterior Choroidal, **P**osterior Communicating, **O**phthalmic, **M**iddle Cerebral, **A**nterior Cerebral). * **Ophthalmic Artery:** The first branch of the cerebral (intracranial) part of the ICA. * **Charcot’s Artery:** The lenticulostriate branches of the **Middle Cerebral Artery** are the most common site of hypertensive hemorrhage. * **Circle of Willis:** The ICA connects to the Vertebrobasilar system via the Posterior Communicating Artery [1].

Q: Which of the following is NOT a branch of the internal carotid artery?

Posterior cerebral artery. The **Internal Carotid Artery (ICA)** is a major vessel supplying the brain and eyes. To answer this question, one must distinguish between the branches of the ICA and the branches of the Vertebrobasilar system. ### **Why Posterior Cerebral Artery (PCA) is the Correct Answer:** The **Posterior Cerebral Artery** is typically the terminal branch of the **Basilar Artery** (part of the posterior circulation). While it forms part of the Circle of Willis by communicating with the ICA via the Posterior Communicating Artery, it does not originate directly from the ICA. ### **Analysis of Incorrect Options:** * **Ophthalmic Artery:** This is the first major branch of the **Cerebral (C4) segment** of the ICA, entering the orbit through the optic canal. * **Superior Hypophyseal Artery:** Arises from the **Cerebral (C4) segment** of the ICA and supplies the pituitary stalk and median eminence. * **Artery of Pterygoid Canal (Vidian Artery):** This is a small branch that arises from the **Petrous (C2) segment** of the ICA (though it can also arise from the external carotid via the maxillary artery). ### **NEET-PG High-Yield Pearls:** 1. **Segments of ICA:** Remember the mnemonic **"Cervical People Get To See Only Mid-Air"** for the 7 segments (C1-C7): Cervical, Petrous, Gasserian (Lacerum), Cavernous, Clinoid, Ophthalmic, and Communicating. 2. **Terminal Branches:** The ICA ends by dividing into the **Anterior Cerebral Artery (ACA)** and **Middle Cerebral Artery (MCA)**. 3. **Circle of Willis:** The PCA is the most common "distractor" in ICA branch questions. Always remember: **ICA = Anterior Circulation; Basilar = Posterior Circulation.** 4. **Clinical Fact:** The ICA has **no branches in the neck** (Cervical segment), a common point of distinction from the External Carotid Artery.

Q: A lesion in the left optic tract typically manifests as which of the following visual field defects?

Right homonymous hemianopia. ### Explanation **1. Why Option D is Correct:** The visual pathway is organized such that the **optic tract** carries fibers from the **ipsilateral temporal retina** and the **contralateral nasal retina** [1]. * The left optic tract contains fibers from the left temporal retina (which sees the right nasal visual field) and the right nasal retina (which sees the right temporal visual field). * Therefore, a lesion in the **left optic tract** results in a loss of the entire **right half of the visual field** in both eyes [1]. This is termed **Right Homonymous Hemianopia**. **2. Analysis of Incorrect Options:** * **A. Left unilateral blindness:** This occurs due to a lesion of the **left optic nerve**. It affects only one eye before the fibers reach the optic chiasm [1]. * **B. Left bilateral hemianopia:** This is a non-standard term. If referring to Bitemporal Hemianopia (loss of both outer fields), it is caused by a lesion at the **optic chiasm** (e.g., Pituitary adenoma) [1]. * **C. Left homonymous hemianopia:** This would be caused by a lesion in the **right optic tract** or right lateral geniculate nucleus [1]. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Rule of Thumb:** Any lesion **posterior to the optic chiasm** (tract, radiation, or cortex) produces a **homonymous** defect on the **contralateral** side [1]. * **Meyer’s Loop (Temporal lobe):** Lesion leads to "Pie in the sky" (Superior Quadrantanopia). * **Baum’s Loop (Parietal lobe):** Lesion leads to "Pie on the floor" (Inferior Quadrantanopia). * **Macular Sparing:** Characteristically seen in PCA (Posterior Cerebral Artery) infarcts affecting the visual cortex, as the macula has a dual blood supply (PCA + MCA) [1].

Q: Charcot's artery is:

Striate branch of middle cerebral artery. **Explanation:** **Charcot’s Artery** (also known as the **Lenticulostriate artery**) is a branch of the **Middle Cerebral Artery (MCA)**. Specifically, it refers to the larger lateral striate branches that supply the internal capsule and basal ganglia [1]. 1. **Why Option B is Correct:** The lateral striate arteries arise from the M1 segment of the MCA. They supply the **posterior limb of the internal capsule**, the putamen, and the caudate nucleus. These vessels are thin-walled, high-pressure branches that are prone to rupture in patients with chronic hypertension, leading to intracerebral hemorrhage [1]. Because of its frequent involvement in strokes, it is famously termed the "Artery of Cerebral Hemorrhage." 2. **Why Other Options are Incorrect:** * **Option A:** The medial striate branch of the Anterior Cerebral Artery (ACA) is known as the **Recurrent Artery of Heubner**. It supplies the head of the caudate nucleus and the anterior limb of the internal capsule. * **Options C & D:** The Fronto-polar and Calloso-marginal arteries are cortical branches of the ACA. They supply the medial surface of the frontal and parietal lobes, not the deep subcortical structures associated with Charcot’s artery. **High-Yield Clinical Pearls for NEET-PG:** * **Common Site of Bleed:** Charcot’s artery rupture typically leads to hemorrhage in the **Putamen** (most common site for hypertensive bleed) [1]. * **Clinical Presentation:** Rupture causes contralateral hemiplegia due to involvement of the motor fibers in the posterior limb of the internal capsule. * **Microaneurysms:** Chronic hypertension leads to the formation of **Charcot-Bouchard aneurysms** in these small perforating vessels, which are distinct from Berry aneurysms (found in the Circle of Willis).

Q: Anomia is seen in lesions of which part of the temporal lobe?

Posterior part. **Explanation:** **Anomia** is a type of aphasia characterized by the inability to name objects, despite knowing what they are and how to use them. It is a hallmark feature of lesions involving the **posterior part of the temporal lobe**, specifically the **angular gyrus** and the **posterior portion of the middle and inferior temporal gyri** [1]. This region acts as a critical hub for lexical retrieval and integrating visual information with language [1]. **Analysis of Options:** * **A. Posterior part (Correct):** This area (including Brodmann area 37 and 39) is essential for naming. Damage here disrupts the connection between the visual recognition of an object and its linguistic label [1]. * **B. Uncus:** Located in the medial temporal lobe, the uncus is part of the olfactory cortex. Lesions here typically result in **uncinate fits** (olfactory hallucinations) or herniation syndromes, not language deficits. * **C. Inferior temporal lobe:** While involved in visual object recognition (the "what" pathway), isolated lesions here usually cause **visual agnosia** (inability to recognize objects) rather than a specific naming deficit (anomia) [2]. * **D. Meyer's loop:** These are the lower fibers of the geniculocalcarine tract that loop around the temporal horn of the lateral ventricle. Damage results in **superior quadrantanopia** ("pie in the sky" visual field defect). **NEET-PG High-Yield Pearls:** * **Wernicke’s Aphasia:** Located in the posterior part of the **Superior** Temporal Gyrus (Brodmann 22). Characterized by fluent but meaningless speech ("word salad") [1]. * **Gerstmann Syndrome:** Associated with the angular gyrus (dominant parietal/temporal junction); features include agraphia, acalculia, finger agnosia, and left-right disorientation. * **Prosopagnosia:** Inability to recognize faces, usually due to bilateral lesions of the **fusiform gyrus** (occipitotemporal lobe) [2].

Q: The posterior communicating artery is a branch of which artery?

Internal carotid artery. **Explanation:** The **posterior communicating artery (PCoA)** is a vital component of the **Circle of Willis**, acting as a bridge between the anterior and posterior cerebral circulations. **1. Why the Correct Answer is Right:** The PCoA arises from the **Cerebral (C4) part of the Internal Carotid Artery (ICA)**. It originates just before the ICA bifurcates into its terminal branches (the anterior and middle cerebral arteries). Its primary function is to connect the ICA system with the Posterior Cerebral Artery (PCA), which is a branch of the basilar artery. **2. Why the Other Options are Incorrect:** * **External carotid artery:** This artery supplies the face and neck structures; it does not contribute to the Circle of Willis or the primary arterial supply of the brain. * **Middle cerebral artery (MCA):** The MCA is a terminal branch of the ICA, not the parent vessel of the PCoA. * **Posterior superior cerebellar artery (Superior Cerebellar Artery):** This is a branch of the basilar artery that supplies the cerebellum and midbrain, not the PCoA. **3. Clinical Pearls for NEET-PG:** * **Aneurysm Site:** The junction of the ICA and the PCoA is the **second most common site** for berry aneurysms in the Circle of Willis. * **CN III Palsy:** An aneurysm of the PCoA often presents with **ipsilateral Third Nerve (Oculomotor) Palsy**, characterized by "down and out" eye deviation and a dilated, non-reactive pupil (due to compression of superficial parasympathetic fibers). * **Circle of Willis Components:** Remember that the ICA gives rise to the Ophthalmic, Anterior Choroidal, and Posterior Communicating arteries before bifurcating.

Question 1

Which is the most common cranial nerve involved in the pathology of an intracranial aneurysm?

Accepted Answer

Abducens nerve (CN VI)

Answer

Oculomotor nerve (CN III)

Answer

Trigeminal nerve (CN V)

Question 2

A 25-year-old male involved in a road traffic accident presents to the emergency department. On examination, he is moaning and unable to speak, but he can understand spoken language. Which of the following areas of the brain is most likely involved?

Accepted Answer

Area B

Answer

Area A

Answer

Area C

Answer

Area D

Question 3

All of the following arteries supply the medulla oblongata, except?

Accepted Answer

Anterior inferior cerebellar artery

Answer

Posterior inferior cerebellar artery

Answer

Anterior spinal artery

Answer

Vertebral artery

Question 4

The medial geniculate body is an eminence on the inferior surface of the thalamus lateral to the midbrain. Which of the following functions is related to the medial geniculate body?

Accepted Answer

Hearing

Answer

Vision

Answer

Balance

Answer

Smell

Question 5

Which of the following is NOT a terminal branch of the internal carotid artery?

Accepted Answer

Cavernous artery

Answer

Anterior cerebral artery

Answer

Middle cerebral artery

Answer

Posterior communicating artery

Question 6

Which of the following is NOT a branch of the internal carotid artery?

Accepted Answer

Posterior cerebral artery

Answer

Ophthalmic artery

Answer

Superior hypophyseal artery

Answer

Artery of pterygoid canal (Vidian artery)

Question 7

A lesion in the left optic tract typically manifests as which of the following visual field defects?

Accepted Answer

Right homonymous hemianopia

Answer

Left unilateral blindness

Answer

Left bilateral hemianopia

Answer

Left homonymous hemianopia

Question 8

Charcot's artery is:

Accepted Answer

Striate branch of middle cerebral artery

Answer

Medial striate branch of anterior cerebral artery

Answer

Fronto-polar artery

Answer

Calloso-marginal artery

Question 9

Anomia is seen in lesions of which part of the temporal lobe?

Accepted Answer

Posterior part

Answer

Uncus

Answer

Inferior temporal lobe

Answer

Meyer's loop

Question 10

The posterior communicating artery is a branch of which artery?

Accepted Answer

Internal carotid artery

Answer

External carotid artery

Answer

Middle cerebral artery

Answer

Posterior superior cerebellar artery

Brain and Neuroanatomy — MCQs

Brain and Neuroanatomy — MCQs

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