Which ONE of the following deep nuclei is indicated in this image of a coronal cross-section through the brain?

Question

BlackTom AI · Accepted Answer

The globus pallidus internal (GPi) lies medial to the putamen and immediately adjacent to the internal capsule, so the labeled structure is the GPi.

1) Relevant knowledge points and concepts
- The lentiform (lenticular) nucleus consists of the putamen (lateral) and globus pallidus (medial). 
- The globus pallidus has two segments: external (GPe, lateral) and internal (GPi, medial). 
- In coronal brain sections the putamen is most lateral, then GPe, then GPi, and finally the internal capsule (white matter) medially. 
- The caudate nucleus sits more superior/medial near the lateral ventricle; the thalamus lies deep and posterior to the internal capsule/fornix region.

2) Step-by-step reasoning
- Locate the arrowed structure on the coronal section: it is within the lentiform region, not in cortex or thalamus. 
- Assess medial–lateral position: the labeled area is medial within the lentiform nucleus and immediately abuts a white-matter band (the internal capsule). 
- Compare relative positions: because it is medial within the lentiform nucleus and next to the internal capsule, it corresponds to the internal segment (GPi), not the lateral putamen or GPe.

3) Calculations/intermediate steps
- No numerical calculations required; the “intermediate steps” are the spatial comparisons above (lateral vs medial and adjacency to internal capsule).

4) Why the correct answer is correct
- GPi is the medial component of the globus pallidus and sits directly next to the internal capsule on coronal slices. The image arrow points to that medial pale band, matching GPi.

5) Why other options are incorrect
- a. Putamen: more lateral, darker, not directly adjacent to the internal capsule. 
- b. Globus pallidus external: lies lateral to GPi (between putamen and GPi); the arrow is more medial than GPe. 
- d. Caudate: located superior/medial near the lateral ventricle, not in the lentiform location shown. 
- e. Thalamus: more posterior/medial and separated from the lentiform nucleus by the internal capsule.

6) Conclusion
The indicated deep nucleus is c. Globus pallidus internal, which matches the provided answer.

Which ONE of the following deep nuclei is indicated in this image of a coronal cross-section through the brain?单项选择题

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Name the nuclear mass that the black arrow is pointing to in this image [input]

Name the nuclear mass that the black arrow is pointing to in this image [input]

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