Projection fiber
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| Brain: Projection fiber | ||
|---|---|---|
| Latin | Fibrae projectionis | |
| Gray's | subject #189 843 | |
| NeuroNames | ancil-219 | |
| Code | TA A14.1.00.018 | |
The projection fibers consist of efferent and afferent fibers uniting the cortex with the lower parts of the brain and with the spinal cord.
Efferent [edit]
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.
Afferent [edit]
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.
External links [edit]
This article incorporates text from a public domain edition of Gray's Anatomy.
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