Projection fibers
From Wikipedia, the free encyclopedia
| Brain: Projection fibers | ||
|---|---|---|
| Latin | fibra projectionis | |
| Gray's | subject #189 843 | |
| NeuroNames | ancil-219 | |
The projection fibers consist of efferent and afferent fibers uniting the cortex with the lower parts of the brain and with the spinal cord.
[edit] Efferent
The principal efferent strands are:
- (1) the motor tract, occupying the genu and anterior two-thirds of the occipital part of the internal capsule, and consisting of
- (a) the geniculate fibers, which decussate and end in the motor nuclei of the cranial nerves of the opposite side; and
- (b) the cerebrospinal fibers, which are prolonged through the pyramid of the medulla oblongata into the medulla spinalis:
- (2) the corticopontine fibers, ending in the nuclei pontis.
[edit] Afferent
The chief afferent fibers are:
- (1) those of the lemniscus which are not interrupted in the thalamus;
- (2) those of the superior cerebellar peduncle which are not interrupted in the red nucleus and thalamus;
- (3) numerous fibers arising within the thalamus, and passing through its stalks to the different parts of the cortex ;
- (4) optic and acoustic fibers, the former passing to the occipital, the latter to the temporal lobe.
[edit] External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
|
|||||||||||||||||||||||||||||||||||||||||
 |
This neuroscience article is a stub. You can help Wikipedia by expanding it. |
