Bassett Collection Large Image - Lane Medical Library, Stanford University Medical Center

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Serial transverse sections of the brain stem

Diencephalon.

A section 4 mm. in thickness has been removed. The tegmental fields (of Forel) are visible at this level.

1 .	Caudate nucleus (tail)
2 .	Circular sulcus
3 .	Third ventricle
4 .	Occipital part internal capsule (posterior limb)
5 .	External medullary lamina (thalamus)
6 .	Thalamic fasciculus (H1 field of Forel)
7 .	Lenticular fasciculus (H2 field of Forel)
8 .	Claustrum
9 .	External capsule
10 .	Lentiform nucleus and posterior part of anterior commissure (lower pointer)
11 .	Hypothalamic nucleus
12 .	Anterior perforated substance and striate arteries
13 .	Optic chiasm
14 .	Corpus callosum
15 .	Lateral ventricle
16 .	Fornix (body)
17 .	Choroid plexus third ventricle and taenia thalami (lower pointer)
18 .	Lateral nucleus of thalamus
19 .	Internal medullary lamina of thalamus
20 .	Medial nucleus of thalamus
21 .	Tegmental field (H field of Forel)
22 .	Mamillary body
23 .	Tuber cinereum
24 .	Amygdaloid nucleus
25 .	Infundibulum (cut across)
26 .	Internal carotid artery