Lobule IV

Cerebellum Protocol Project
Whole Cerebellum	Lobe Definitions	Vermis Definition	Lobule Delineation
Lobules I/II	Lobule III	Lobule IV	Lobule V
Lobule VI	Lobule VIIAf	Lobule VIIAt	Lobule VIIB
Lobule VIIIA	Lobule VIIIB	Lobule IX	Lobule X
Lobules VIIIA-X vermis		Lobules VI-VIIB vermis

Lobule IV

• Location: Top portion of the cerebellum, focused around the midline
• Description: It can first be identified in the midsagittal slice, as the lobule to the left (inwards) of the top most vertical fissure.
• It is bounded on one side by lobule III. On the other the boundary is the most prominent fissure between llobule III and the primary fissure.

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  Figure 1:I choose 3 screen shots of one particularily difficult section. The boundary between lobules 4 and 5 on the left was straightforward but there was trouble on the right. The sequence was carefully delineated to create a gradual change as the slices progress.

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  "Figure 2:The fissure chosen was the widest at the center of the saggital view but including one additional branch in 4 at the center would also have been acceptable.

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  Figure 3:The final of the sequence.

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  Figure 4:The boundary between lobules V and VI is very unclear throughout this scan and was estimated using experience.

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  Figure 5:The Branch indicated seems to switch from lobule V to lobule VI when moving from the center to the edge of the scan. In this case it was assigned by considering the center position to be more important.

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  Figure 6:This is a clear boundary between IV and V in the axial view.