Slice SM+1 depicts which anatomical features?

Slice SM+1 depicts which anatomical features?

• A. Body of lateral ventricle; Supramarginal gyrus; Angular gyrus (neck, brow, eye, nose)
• B. Choroid plexus; Atrium
• C. Fourth ventricle; Cerebellum
• D. Inferior portion; Anterior horn

Answer: (A)

This slice is through the temporoparietal junction, so the structures you expect to see are the components of the lateral ventricle’s body and the parietal association cortex wrapping around the Sylvian fissure. The body of the lateral ventricle appears as a curved CSF-filled cavity within the white matter of the parietal region. Adjacent to it, you can identify the supramarginal gyrus, which runs along the upper edge of the lateral sulcus, and just posterior to that the angular gyrus, forming the posterior part of the inferior parietal lobule. This combination of a ventricular body plus these two gyri is the hallmark of this level. Why the other possibilities don’t fit at this plane: a slice that shows the fourth ventricle and cerebellum would be much lower and in the posterior fossa, not near the lateral ventricle and temporoparietal junction. The choroid plexus and the atrium can be seen in ventricle-related images, but they don’t capture the specific pairing of the supramarginal and angular gyri around the Sylvian fissure. An anterior horn would be more frontal and not near the temporoparietal structures described here.

This slice is through the temporoparietal junction, so the structures you expect to see are the components of the lateral ventricle’s body and the parietal association cortex wrapping around the Sylvian fissure. The body of the lateral ventricle appears as a curved CSF-filled cavity within the white matter of the parietal region. Adjacent to it, you can identify the supramarginal gyrus, which runs along the upper edge of the lateral sulcus, and just posterior to that the angular gyrus, forming the posterior part of the inferior parietal lobule. This combination of a ventricular body plus these two gyri is the hallmark of this level.

Why the other possibilities don’t fit at this plane: a slice that shows the fourth ventricle and cerebellum would be much lower and in the posterior fossa, not near the lateral ventricle and temporoparietal junction. The choroid plexus and the atrium can be seen in ventricle-related images, but they don’t capture the specific pairing of the supramarginal and angular gyri around the Sylvian fissure. An anterior horn would be more frontal and not near the temporoparietal structures described here.