Assertion: midbrain | /r/HasAspect | three portions
Facets:
Source sentences:
text: When viewed in cross-section, the midbrain can be divided into three portions:
text: The midbrain is the least differentiated and the smallest segment of the brainstem and can be divided into three portions: a medial segment (the tegmentum) which includes DA manufacturing neurons and which represents the anterior continuation of the reticular formation (described below); the most recently evolved ventral segment through which pass descending cortical fibers; and the tectum which is dorsally located and includes the superior (visual) and inferior (auditory) colliculi.