The cerebral peduncle
, by most classifications, is everything in the mesencephalon
except the tectum
. The region includes the midbrain tegmentum
, crus cerebri
, substantia nigra
. By this definition, the cerebral peduncles are also known as the basis pedunculi,
while the large ventral bundle of efferent fibers is referred to as the crus cerebri
or the pes pedunculi
There are numerous nerve tracts located within this section of the brainstem. Of note, in the cerebral peduncular loop
fibers from motor areas of the brain project to the cerebral peduncle and then project to various thalamic nuclei
In as much as the peduncles are an anatomic landmark, for details regarding the function of this area interested readers are referred to the individual referenced articles. On a broad scale, though, this area contains many nerve tracts conveying motor information to and from the brain to the rest of the body.
Important fibers running through the cerebral peduncles include the corticospinal tract and the corticobulbar tract, among others.