1. Cerebral aqueduct (aqueduct of Sylvius)
- 1.Cerebral aqueduct (aqueduct of Sylvius)
- 2.Periaqueductal grey
- 3.Substantia nigra
- 4.Cerebral peduncle
- 5.Interpeduncular fossa
- 6.Superior colliculi
In this view we see:
- A hugely magnified cross-sectional view of the upper brainstem, showing the dark lines of the substantia nigra on each side of the midbrain. The human midbrain is about 2.5 centimetres from anterior to posterior at this level.
- We are looking down from above, with posterior at the top and anterior at the bottom (remember that this is the opposite of CT and MRI images where the view is as though we are standing at the foot of a patient's bed with the patient lying on their back, therefore anterior is at the top and posterior at the bottom in CT and MRI images).
- Some features of the midbrain mentioned in Image 8 are only visible in Image 10, including the cerebral aqueduct, periaqueductal grey and interior of the cerebral peduncles.