It consists of fibers that are said to arise in the
parolfactory area, the
gyrus subcallosus and the
anterior perforated substance, and course backward in the
longitudinal striae to the
dentate gyrus and the
hippocampal region. This is a
cholinergic bundle of nerve fibers posterior to the
anterior perforated substance. It interconnects the
subcallosal gyrus in the
septal area with the
hippocampus and
lateral olfactory area.
Nuclei Two structures are often described in this brain regions, namely the nuclei of the vertical and horizontal limbs of the diagonal band of Broca (nvlDBB and nhlDBB, respectively). nvlDBB projects to the
hippocampal formation through the
fornix and it is the second largest assembly of cholinergic neurons in the basal forebrain whereas nhlDBB projects to the
olfactory bulb and it does not have a significant population of cholinergic neurons.
Development It is one of the
basal forebrain structures that are derived from the ventral
telencephalon during development. ==Function==