34
W. L. Nowinski
Fig. 2.23 Dural sinuses (the midline and left hemisphere sinuses are labelled)
2.4.1 Commissural Tracts
The commissural tracts interconnect both hemispheres across the median plane. The
main commissural tracts are (Fig. 2.28):
• Corpus callosum
• Anterior commissure
• Posterior commissure
The corpus callosum (the great commissure) is the largest commissure. Its three
main parts: genu (knee), body, and splenium, connect the frontal lobes, wide areas
of hemispheres, and the occipital lobes, respectively.
The anterior commissure connects the temporal lobes, while the posterior
commissure links the midbrain, thalamus, and hypothalamus on both sides.
2.4.2 Association Tracts
The association tracts interconnect different cortical regions of the same cerebral
hemisphere. There are two types of the association tracts:
• Short arcuate fibres that connect adjacent gyri (so-called U fibres)
• Long arcuate fibres interconnecting widely separated gyri
W. L. Nowinski
Fig. 2.23 Dural sinuses (the midline and left hemisphere sinuses are labelled)
2.4.1 Commissural Tracts
The commissural tracts interconnect both hemispheres across the median plane. The
main commissural tracts are (Fig. 2.28):
• Corpus callosum
• Anterior commissure
• Posterior commissure
The corpus callosum (the great commissure) is the largest commissure. Its three
main parts: genu (knee), body, and splenium, connect the frontal lobes, wide areas
of hemispheres, and the occipital lobes, respectively.
The anterior commissure connects the temporal lobes, while the posterior
commissure links the midbrain, thalamus, and hypothalamus on both sides.
2.4.2 Association Tracts
The association tracts interconnect different cortical regions of the same cerebral
hemisphere. There are two types of the association tracts:
• Short arcuate fibres that connect adjacent gyri (so-called U fibres)
• Long arcuate fibres interconnecting widely separated gyri