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Quiz: A Tour of the Brain: Neuroanatomy

Test your understanding of Chapter 4. Choose the best answer, then click Show Answer to check.

Question 1

Which lobe of the cerebral cortex contains the primary visual cortex?

  1. Frontal lobe
  2. Temporal lobe
  3. Occipital lobe
  4. Parietal lobe
Show Answer

The correct answer is C. The occipital lobe, at the very back of the head, is mainly for vision and contains the primary visual cortex. The temporal lobe (B) is a common mix-up because it handles hearing and helps recognize faces, but it is not where visual signals first arrive in the cortex.

Concept Tested: Occipital Lobe Bloom's Level: Remember

Question 2

Which layer of the meninges lies directly against the skull?

  1. Dura mater
  2. Arachnoid mater
  3. Pia mater
  4. Choroid plexus
Show Answer

The correct answer is A. The dura mater ("tough mother") is the thick outer layer pressed against the bone. The pia mater (C) is the innermost layer that clings to the brain's surface, and the choroid plexus (D) is the tissue in the ventricles that makes cerebrospinal fluid, not a meningeal layer.

Concept Tested: Meninges Bloom's Level: Remember

Question 3

Which sense does NOT pass through the thalamus before reaching the cerebral cortex?

  1. Vision
  2. Hearing
  3. Touch
  4. Smell
Show Answer

The correct answer is D. The thalamus relays every sense to the correct area of cortex except smell. Vision (A) is a tempting choice, but visual signals do stop in the thalamus on their way to the occipital lobe.

Concept Tested: Thalamus Bloom's Level: Remember

Question 4

Why is the surface of the human cerebral cortex so deeply folded into gyri and sulci?

  1. The folds are scars left by the brain pressing against the skull during growth.
  2. Folding lets a large sheet of cortex fit inside the limited space of the skull.
  3. The folds separate gray matter from white matter so they cannot mix.
  4. Each fold holds one specific memory, so more folds mean more memories.
Show Answer

The correct answer is B. Spread flat, the cortex would be roughly the size of a pillowcase. Crumpling it into folds, like a tablecloth stuffed into a small box, lets much more cortex fit inside the skull. Option D reflects a popular myth: memories are not stored one per fold.

Concept Tested: Cerebral Cortex Bloom's Level: Understand

Question 5

Why does white matter look white?

  1. It contains more cerebrospinal fluid than gray matter.
  2. It has no blood vessels.
  3. Its axons are wrapped in fatty myelin.
  4. It is made mostly of neuron cell bodies.
Show Answer

The correct answer is C. White matter is made of bundles of axons wrapped in myelin, a fatty insulation that gives it its pale color. Option D describes gray matter, which is packed with cell bodies, dendrites, and synapses.

Concept Tested: White Matter Bloom's Level: Understand

Question 6

Just before a penalty kick, Maya's heart pounds, her mouth goes dry, and her pupils widen. Which statement best explains these changes?

  1. Her parasympathetic system is active, mainly releasing acetylcholine onto her organs.
  2. Her sympathetic system is active, and most of its neurons release norepinephrine onto her organs.
  3. Her somatic nervous system is consciously speeding up her heart.
  4. Her cerebellum is preparing her body for the kick.
Show Answer

The correct answer is B. A faster heart, dry mouth, and wide pupils are "fight or flight" responses of the sympathetic branch of the autonomic nervous system, and most sympathetic neurons release norepinephrine at the target organ. Option A reverses the branches: the parasympathetic system slows the heart and increases saliva.

Concept Tested: Sympathetic vs Parasympathetic Bloom's Level: Understand

Question 7

A 45-year-old man has an unsteady walk and a clumsy, poorly aimed right arm. His strength and sensation are normal. Where is the damage most likely located?

  1. Right half of the cerebellum
  2. Left half of the cerebellum
  3. Left primary motor cortex
  4. Right parietal lobe
Show Answer

The correct answer is A. Clumsy, poorly aimed movement with normal strength is ataxia, a sign of cerebellar damage. Unlike the cerebrum, each half of the cerebellum coordinates the same side of the body, so a clumsy right arm points to the right cerebellum. Option B applies the cerebrum's crossing rule to the cerebellum, which is the most common error.

Concept Tested: Cerebellum Bloom's Level: Apply

Question 8

A child's brain scan shows greatly enlarged lateral ventricles and third ventricle, but a normal-sized fourth ventricle. Based on the path of cerebrospinal fluid, where is the blockage most likely?

  1. In the choroid plexus of the lateral ventricles
  2. In the subarachnoid space around the spinal cord
  3. In the arachnoid villi where CSF drains into the veins
  4. In the cerebral aqueduct between the third and fourth ventricles
Show Answer

The correct answer is D. CSF flows from the lateral ventricles to the third ventricle, through the narrow cerebral aqueduct, and into the fourth ventricle. If everything before the aqueduct is swollen but the fourth ventricle is normal, fluid is backing up at the aqueduct. A blockage at the arachnoid villi (C) would make all four ventricles enlarge.

Concept Tested: Ventricles and CSF Bloom's Level: Apply

Question 9

After a car crash, a 22-year-old woman has normal strength, sensation, coordination, and vision. Her family says she now makes reckless decisions, interrupts people rudely, and can't follow through on plans. Which region is most likely damaged?

  1. Primary motor cortex
  2. Occipital lobe
  3. Prefrontal cortex
  4. Cerebellum
Show Answer

The correct answer is C. Normal strength rules out the motor cortex (A), normal vision rules out the occipital lobe (B), and normal coordination rules out the cerebellum (D). Changes in planning, impulse control, and social behavior with everything else intact point to the prefrontal cortex, the brain's executive center, which is often bruised when the head stops suddenly.

Concept Tested: Prefrontal Cortex Bloom's Level: Analyze

Question 10

A 1994 reconstruction concluded that Phineas Gage's iron damaged both frontal lobes, but studies in 2004 and 2012 concluded that only the left frontal lobe was damaged. What best explains why the later conclusions are considered more reliable?

  1. The later studies relied on new eyewitness accounts of the accident.
  2. The later studies used scans of Gage's actual skull, while the 1994 study used a model skull shaped to match his.
  3. The later studies examined Gage's preserved brain tissue.
  4. The 1994 study ignored Dr. Harlow's report that Gage lost vision in his left eye.
Show Answer

The correct answer is B. Ratiu and colleagues (2004) and Van Horn and colleagues (2012) worked from scans of Gage's real skull, which is kept at Harvard's Warren Anatomical Museum, so their trajectory was based on the actual bone. Option C is wrong because only the skull and tamping iron survive, not his brain, and there are no new eyewitness accounts (A).

Concept Tested: Localization of Function Bloom's Level: Analyze