Quadrigeminal Cistern

Digitationes Hippocampi
FIG. 3.18. Intraventricular aspect of the right hippocampus. The temporal horn of the lateral ventricle has been opened and the choroid plexuses have been removed.

1 Hippocampal body

2 Hippocampal head: digitationes hippocampi

3 Hippocampal tail

4 Fimbria

5 Crus of the fornix

6 Splenium of the corpus callosum

7 Calcar avis in the occipital horn

8 Collateral trigone

9 Collateral eminence

10 Uncal recess of the temporal horn (the amygdala overlying the hippocampal head has been removed)

11 Uncal part of the hippocampus

12 Parahippocampal gyrus (subiculum)

13 Hippocampal sulcus

Sectional Anatomy Hippocampus
FIG. 3.19. MRI view of a section passing through the hippocampal axis (inverted T2-weighted image).

1 Hippocampal body, cornu ammonis

2 Hippocampal body, gyrus dentatus

3 Hippocampal sulcus

4 Subiculum

5 Hippocampal head

6 Amygdala

7 Hippocampal tail

8 Atrium of the lateral ventricle

9 Quadrigeminal cistern

10 Brachium conjunctivum

11 Substantia nigra

12 Crus cerebri

13 Ambient cistern

14 Coliicuius

Crus Cerebri
FIG. 3.20. Medial aspect of the hippocampus.

Hippocampal body:

1 Superficial part of the gyrus dentatus (margo denticulatus)

2 Cornu ammonis

3 Fimbria displaced upwards (arrows) to show the cornu ammonis

Hippocampal head (uncal part):

4 Apex of the uncus

5 Band of Giacomini (the uncal extension of the margo denticulatus (1))

5' Uncal sulcus

6 Gyrus uncinatus

The anterior part of the uncus, which belongs to the parahippo-campal gyrus (and is often called piriform lobe), is composed of:

7 Semilunar gyrus

8 Prepiriform cortex

9 Gyrus ambiens

10 Entorhinal area

11 Parahippocampal gyrus

12 Collateral sulcus

Hippocampal tail

13 Gyri of Andreas Retzius

14 Fasciola cinerea prolonging the gyrus dentatus

15 Gyrus fasciolaris which is the extension of the cornu ammonis in the tail

16 The gyrus subsplenialis prolongs the gyrus fasciolaris and is itself continued by the indusium griseum (17) on the dorsum of the corpus caliosum (18)

19 Isthmus

20 Anterior calcarine sulcus

21 Cingulate gyrus

22 Cingulate sulcus

23 Subcallosal area

24 Anterior perforated substance

25 Anterior commissure

26 Fornix

27 Crus of the fornix

The dotted area indicates the limbic lobe. The a-a line indicates the plane of the section of Figure 3.21.

Brachium Superior Colliculus
Hippocampal Sulcus
FIG. 3.21. Diagram of a transverse section of the hippocampus. The hippocampus is composed of two cortical layers, the gyrus dentatus (1) and the cornu ammonis (2), superficially separated by the hippocampal sulcus (arrow) and covered with fimbria (3) and alveus (3').

CA1, CA2, CA3, CA4 Fields of cornu ammonis

4 Tela choroidea of the temporal horn (fissura choroidea)

5 Stria terminalis

6 Tail of caudate nucleus

7 Temporal horn of the lateral ventricle

8 Collateral eminence

9 Collateral sulcus

10 Parahippocampal gyrus

11 Entorhinal area

12 Subicuium

13 Lateral geniculate body

14 Lateral part of the transverse fissure (wing of the ambient cistern)

15 Ambient cistern

16 Crus cerebri

17 Pons

18 Tentorium cerebelli

19 Temporal, petrous part

Crural Cistern
FIG. 3.22. Horizontal section of the upper mesencephalon. The plexuses removed to show the right and left hippocampi.

1 Endoventricular view of the hippocampal body

1' Endoventricular view of the hippocampal head (digitationes hippocampi) 1" Endoventricular view of the hippocampal tail

2 Fimbria

3 Collateral eminence

4 Occipital horn of the lateral ventricle

5 Calcaravis

6 Anterior calcarine sulcus

The two hippocampi encircle the mesencephalon:

7 Crus cerebri

8 Substantia nigra

9 Red nucleus

10 Cerebral aqueduct horns of the lateral ventricles have been opened and the choroid

11 Superior colliculus

12 Posterior cerebral artery

13 Uncus

14 Oculomotor nerve

15 Basilar artery

16 Hypophysial stalk

17 Middle cerebral artery

18 Optic nerve

19 Anterior clinoid process.

Subarachnoid cisterns: a interpeduncular cistern b crural cistern c ambient cistern d quadrigeminal cistern

Brachium Superior Colliculus
FIG. 3.23. Horizontal section of the lower mesencephalon. The temporal horns of the lateral ventricles have been opened and the choroid plexuses removed to show the right and left hippocampi.

1 Endoventricular view of the hippocampal body

1' Endoventricular view of the hippocampal head (digitationes hippocampi) 1" Endoventricular view of the tail

2 Fimbria

3 Collateral eminence

4 Occipital horn of the lateral ventricle

5 Calcar avis

6 Anterior calcarine sulcus

7 Crus cerebri

8 Substantia nigra

9 Superior cerebellar peduncle

10 Inferior colliculus

11 Free edge of the tentorium cerebelli, which delimits the tentorial opening, encircles the mesencephalon and is in close contact with the two hippocampi

12 Posterior cerebral artery

13 Uncus

14 Oculomotor nerve

15 Hypophysial stalk

16 Middle cerebral artery

17 Optic nerve

18 Anterior clinoid process

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