General
- Contains both commissural and projection fibres
- C shaped
Connections
- Origin
- Hippocampal fimbriae (floor of temporal horn)
- Termination
- Mammillary bodies
- Some fibres of the fornix that descend in front of the anterior commissure terminate in septal area.
- Some of these fibres turn backwards to enter the stria medullaris thalami and reach the habenular nuclei.
- Commissure of fornix (hippocampal commissure)
- Each fornix is connected to each other
Parts
- Fimbria
- Arises in the floor of the temporal horn on the ventricular surface of the hippocampal formation and passes posteriorly to become the crus of the fornix.
- Crus
- Each crus wraps around the posterior surface of the pulvinar of the thalamus and arches superomedially toward the lower surface of the splenium of the corpus callosum.
- Both crura are united by the hippocampal commissure, and in the body of the corpus callosum
- Body
- At the junction of the atrium and the body of the lateral ventricle, the paired crura meet to form the body of fornix, which runs forward along the superomedial border of the thalami in the medial wall of the body of the lateral ventricle.
- The body forms a gentle arch located between the roof of the third ventricle and the floor of the body of each lateral ventricle.
- Body of the fornix is suspended from the corpus callosum by the septum pellucidum
- Columns
- The body of fornix splits into two columns to form the anterior margin of the openings of the foramen of Monro into the lateral ventricles.
- Two columns left and right
- At the level of the foramen of Monro, fornix forms the anterior and superior margin of the openings of the foramen of Monro
- Each column bifurcates into 2 portion
- Post-commissural portion directed toward the mammillary body @ floor of 3rd ventricle
- predominant
- Pre-commissural portion that ends in the septal region
Relations
- Inferior
- Thalamus
- lateral ventricle (forms the roof)
- Curves around the pulvinar of thalamus
- Interconnects through the hippocampal commissure
Function
- Spatial orientation
- Memory
Deficit
- Anterograde amnesia
- Alzheimer disease
- Dementia
- Epilepsy
- Schizophrenia
Made with Bullet