Classification
By Segments
- Neural Features and Subdivision of the Medial Temporal Region
Segment | Average Length of Segment | Surface | Neural Composition |
Anterior | 28 mm (range, 22-38) | Anterior-superior | Anterior segment of uncus |
ㅤ | ㅤ | Medial | Posterior segment of uncus |
ㅤ | ㅤ | Inferior | Entorhinal area |
Middle | 20 mm (range, 15-25) | Superior | Subiculum |
ㅤ | ㅤ | ㅤ | Dentate gyrus |
ㅤ | ㅤ | ㅤ | Fimbria |
ㅤ | ㅤ | Medial | Presubiculum |
ㅤ | ㅤ | Inferior | Post. parahippocampal gyrus |
Posterior | 31 mm (range, 22-41) | Anterior | Isthmus (anterior surface) |
ㅤ | ㅤ | ㅤ | Hippocampal tail |
ㅤ | ㅤ | ㅤ | Crus of fornix |
ㅤ | ㅤ | Medial | Isthmus (medial surface) |
ㅤ | ㅤ | ㅤ | Precuneus (inferior portion) |
ㅤ | ㅤ | Inferior | Lingual gyrus (anterior to calcarine point) |
- Anterior segment of the MTR
- Related to the proximal sylvian and carotid cisterns anteriorly, and the crural cistern posteriorly.
- Bld supply
- Carotid, MCA, AChA, and PCA.
- Venous drainage
- Striate (red interrupted line) segments of the basal vein
- Anterior peduncular (green interrupted line) segments of the basal vein
- Middle segment
- Related to the ambient cistern
- Bld supply
- PCA
- Venous drainage
- Posterior peduncular (purple interrupted line) segments of the basal vein
- Proximal mesencephalic (aqua interrupted line) segments of the basal vein
- Posterior segment
- Related to the quadrigeminal cistern
- Bld supply
- PCA
- Venous drainage
- Distal mesencephalic segment (yellow interrupted line) of the basal vein
By relation to tentorial groove
- Mesial temporal lobe that is located above the tentorial groove
- Normally herniates medially to the free edge of the tentorium and is related medially to the carotid, crural, interpeduncular, and ambient cisterns
- Mesial temporal lobe that is located below the tentorial groove
- Is related to the cavernous sinus
Images
1, Basilar artery;
2, Pituitary gland;
3, Supraclinoidal segment of the internal carotid artery and ophthalmic artery;
4, Optic nerve and sphenoid sinus;
5, Trochlear nerve;
6, Superior cerebellar artery;
7, Posterior bend of the cavernous carotid artery and oculomotor nerve;
8, Tentorial edge;
9, Trigeminal nerve;
10, V1 and trochlear nerve;
11, Gasserian ganglion;
12, V2;
13, Petrous apex;
14, V3;
15, Facial and superior vestibular nerves;
16, Petrous carotid artery;
17, Geniculate ganglion;
18, Middle meningeal artery;
19, Semicircular canals
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