This is a view of the brain similar to the previous brain section, in the coronal plane. The T2 MRI has been adjusted on the viewing screen to invert the displayed image (sometimes called an inverted video view). The distinction between the gray matter and the white matter is enhanced with this view; the CSF is dark. Note that the tables of the skull are now white, and the bone marrow is dark. The superior sagittal sinus is seen in the midline, at the top of the falx cerebri (bright).
The cortex and white matter can be easily differentiated. The corpus callosum is seen crossing the midline. The caudate nucleus is diminishing in size, from the head (anteriorly) to the body (posteriorly — compare with another coronal section of the brain, see Figure 74). The lentiform nucleus is still present and the thalamus can be seen adjacent to the third ventricle.
By definition, the section has passed through the posterior limb of the internal capsule (see Figure 26). Its fibers are seen as continuing to become the cerebral peduncle (see Figure 6 and Figure 7). The plane of section includes the lateral fissure, and the insula (see Figure 17B). The temporal lobe includes the hippocampal formation and the inferior horn of the lateral ventricle (see Figure 20A, Figure 20B, and Figure 74).
The lateral ventricle is seen, divided by the septum pellucidum into one for each hemisphere (see also Figure 62). Again, the plane of section has passed through the foramina of Monro, connecting to the third ventricle, which is situated between the thalamus on either side.
This view also includes the brainstem — the midbrain (the cerebral peduncles), the pons (the ventral portion), and the medulla. The trigeminal nerve has been identified at the midpontine level. The tentorium cerebelli can now be clearly seen (see Figure 17 and Figure 41B), with its opening (also called incisura) at the level of the midbrain (discussed with uncal herniation, see Figure 15B).
Tables of skull Marrow of skull
Septum pellucidum Insula i
Lentiform n. (putamen and globus pallidus)
Superior sagittal sinus
Internal capsule 3rd ventricle Lateral fissure
Lateral ventricle (inferior horn)
Trigeminal nerve (CN V)
F = Frontal lobe T = Temporal lobe
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