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Bassett Collection of Stereoscopic Images of Human Anatomy

Exploration of the brain from the medial aspect

Column of fornix, mammillothalamic tract and periventricular fibers

Image #16-1

KEYWORDS: Brain, Diencephalon, Telencephalon.

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Higher resolution images are available for a fee. Contact Drew Bourn, PhD, MLIS.

Exploration of the brain from the medial aspect
Column of fornix, mammillothalamic tract and periventricular fibers
Removal of the gray matter of the hypothalamus exposes some of the periventricular fibers coursing from the hypothalamic area toward the mesencephalon. Lateral to these, in the depths of the dissection, the column of the fornix (6) is seen as it approaches the mammillary body and the mammillothalamic tract (8) as it leaves. The dissected area (3) of the thalamus contains longitudinally coursing fibers of the internal medullary lamina. More posteriorly, fine fibers are found medial to the position of the fasciculus retroflexus (uncovered in a later dissection). Fibers of the third nerve (32) are exposed within the tegmentum of the mesencephalon.
1 . Septum pellucidum
2 . Fornix (body)
3 . Dissection of the medial nucleus of the thalamus exposing the internal medullary lamina
4 . Choroid plexus third ventricle and interventricular foramen
5 . Anterior commissure
6 . Tectal part of column of fornix
7 . Periventricular fibers in hypothalamic region
8 . Mamillothalamic tract
9 . Posterior parolfactory sulcus and subcallosal gyrus
10 . Lamina terminalis
11 . Parolfactory area
12 . Optic recess and optic chiasm
13 . Anterior communicating artery
14 . Anterior cerebral artery
15 . Infundibulum of hypothalamus and infundibular recess
16 . Optic nerve (II)
17 . Internal carotid artery
18 . Posterior communicating artery
19 . Uncus (hippocampal gyrus)
20 . Posterior cerebral artery right
21 . Posterior cerebral artery left (cut off)
22 . Superior cerebellar artery (cut oft)
23 . Basilar artery
24 . Meninges within transverse fissure
25 . Corpus callosum (splenium)
26 . Stria medullaris thalami
27 . Pineal body
28 . Posterior commissure
29 . Periventricular fibers medial to fasciculus retroflexus
30 . Quadrigeminal plate
31 . Cerebral aqueduct
32 . Filaments of oculomotor nerve (III) within tegmentum
33 . Mamillary body
34 . Substantia nigra
35 . Decussation brachium conjunctivum
36 . Interpeduncular fossa
37 . Dorsal part of pons