Anatomy hippocampus
introduction
• Hippocampus is a
curved structure on the
medial aspect of
temporal lobe that
bulges into floor of
temporal ...
• Consists of two
interlocking U shaped
gray matter structures
– Hippocampus proper
( Ammon horn)
Superolateral, upsidedow...
Anatomic divisions
Head ( Pes hippocampus )
• most anterior part, oriented transversely
• 3 – 4 digitations on superior su...
Hippocampus sulcus
• The hippocampal
sulcus, also known as
the hippocampal
fissure, is a sulcus that
separates the dentate...
Based of histology
– Cornu Ammonis (CA)
•
•
•
•

CA1
CA2
CA3
CA4

– Dentate Gyrus
• Fascia Dentata
• Hilus (region CA4)
relationship
• Medially, the ambient cistern which
separates the hippocampus from
brainstem.
• Choriodal fissure and tempo...
amygdala / hippocampal
head
• The best landmark for separating amygdala
from hippocampus is the anterior temporal
horn, kn...
hippocampal head
• morphology: hippocampal
digitations, (pes hippocampus)
• landmarks
– basilar artery to interpeduncular ...
hippocampal body
– Morphology: Swiss roll appearance, of two
interlocking U-shaped structures (cornu
ammonis and dentate g...
hippocampal tail
• morphology: smaller and harder to
describe internal structure.
• landmarks
– The hippocampal tail is
de...
Best choice of imaging
• MR in a slightly oblique plane,
perpendicular to long axis of
hippocampus.
– Coronal T1 weighted
...
MRI imaging
Amygdala lies anterior &superior to hippocampus, at
medial aspect of temporal lobe.
Tail of caudate nucleus ends in amygda...
Digitations of the hippocampal head (pes hippocampus).
The hippocampus is separated from amygdala by uncal
recess of tempo...
Hippocampal body is bordered medially by ambient
cistern & laterally by temporal horn of lateral ventricle.
Hippocampal fissural cyst is normal variant ( incomplete
fusion of hippocampal sulcus )
Image at posterior thalamus shows tail of hippocampus.
Tail is narrowest portion of hippocampus as it extends
posteriorly.
Image through splenium of corpus callosum shows
fimbria as it becomes crus of fornix.
Two crus of fornix unite to form com...
Zoomed image of coronal view
Uncus the medial most structure, lateral to it is the
amygdala which is superior to temporal horn
The uncal recess separates the amygdala from
hippocampal head
Tail is narrowest portion of hippocampus as it extends
posteriorly.
Sagittal section the whole of hippocampus is seen
posterior to temporal horn
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Anatomy of hippocampus ( radiology )
Upcoming SlideShare
Loading in …5
×

Anatomy of hippocampus ( radiology )

32,186 views

Published on

Published in: Education

Anatomy of hippocampus ( radiology )

  1. 1. Anatomy hippocampus
  2. 2. introduction • Hippocampus is a curved structure on the medial aspect of temporal lobe that bulges into floor of temporal horn. • Hippocampus – seahorse • Curved shape which resembles a shape of a seahorse.
  3. 3. • Consists of two interlocking U shaped gray matter structures – Hippocampus proper ( Ammon horn) Superolateral, upsidedown U. – Dentate gyrus Inferomedial U
  4. 4. Anatomic divisions Head ( Pes hippocampus ) • most anterior part, oriented transversely • 3 – 4 digitations on superior surface. Body • Cylindrical, oriented parasagittally. Tail • Most posterior, narrows then curves around splenium to form indusium griseum above cc.
  5. 5. Hippocampus sulcus • The hippocampal sulcus, also known as the hippocampal fissure, is a sulcus that separates the dentate gyrus from the subiculum.
  6. 6. Based of histology – Cornu Ammonis (CA) • • • • CA1 CA2 CA3 CA4 – Dentate Gyrus • Fascia Dentata • Hilus (region CA4)
  7. 7. relationship • Medially, the ambient cistern which separates the hippocampus from brainstem. • Choriodal fissure and temporal horn superiorly. • Parahippocampal gyrus inferiorly. • temporal horn of lateral ventricle laterally.
  8. 8. amygdala / hippocampal head • The best landmark for separating amygdala from hippocampus is the anterior temporal horn, known as the uncal recess. • The amygdala is always superior to the temporal horn.
  9. 9. hippocampal head • morphology: hippocampal digitations, (pes hippocampus) • landmarks – basilar artery to interpeduncular cistern.
  10. 10. hippocampal body – Morphology: Swiss roll appearance, of two interlocking U-shaped structures (cornu ammonis and dentate gyrus) – landmark: • The hippocampal body is oval and found adjacent to the brainstem • The white matter tracts of the alveus and fimbria are superior to the hippocampus.
  11. 11. hippocampal tail • morphology: smaller and harder to describe internal structure. • landmarks – The hippocampal tail is demonstrated as it ascends posterior to the brainstem. – from the point at which the fornix can be seen in full profile.
  12. 12. Best choice of imaging • MR in a slightly oblique plane, perpendicular to long axis of hippocampus. – Coronal T1 weighted – Coronal T2 high resolution – Coronal FLAIR.
  13. 13. MRI imaging
  14. 14. Amygdala lies anterior &superior to hippocampus, at medial aspect of temporal lobe. Tail of caudate nucleus ends in amygdala. Pes hippocampus (hippocampal head) lies just posterior to amygdala.
  15. 15. Digitations of the hippocampal head (pes hippocampus). The hippocampus is separated from amygdala by uncal recess of temporal horn. The uncinate gyrus connects medial hippocampus with amygdala.
  16. 16. Hippocampal body is bordered medially by ambient cistern & laterally by temporal horn of lateral ventricle.
  17. 17. Hippocampal fissural cyst is normal variant ( incomplete fusion of hippocampal sulcus )
  18. 18. Image at posterior thalamus shows tail of hippocampus. Tail is narrowest portion of hippocampus as it extends posteriorly.
  19. 19. Image through splenium of corpus callosum shows fimbria as it becomes crus of fornix. Two crus of fornix unite to form commissure of fornix (hippocampal commissure).
  20. 20. Zoomed image of coronal view
  21. 21. Uncus the medial most structure, lateral to it is the amygdala which is superior to temporal horn
  22. 22. The uncal recess separates the amygdala from hippocampal head
  23. 23. Tail is narrowest portion of hippocampus as it extends posteriorly.
  24. 24. Sagittal section the whole of hippocampus is seen posterior to temporal horn

×