Fibers Arc-shaped Internal

Arc-shaped internal fibers (lat. f. arcuatae internae) are bundles of nerve fibers that make up the corpus callosum. They connect the cerebral cortex with the cerebellar nuclei, forming a brain bridge.

Arc-shaped internal fibers are divided into 3 groups:

1. Anterior (lat. f. arcuatae anteriores) - connects the frontal and parietal lobes of the cerebral cortex with the nuclei of the cerebellar vermis.

2. Middle (lat. f. arcuatae mediae) - connect the temporal lobes of the cortex with the nuclei of the middle cerebellar peduncle.

3. Posterior (lat. f. arcuatae posteriores) - go from the occipital lobes to the nuclei of the lower cerebellar peduncles.

Thus, arcuate internal fibers provide connection between the cerebral cortex and the cerebellum, participating in the coordination of movements and regulation of muscle tone.

Internal arch fibers (d) are thread-like elements of the framework of the pulmonary artery bundle and the SVC that resemble the shape of the arch. Fibers play an important role in maintaining the strength and stability of the artery wall. They help harden the arterial wall, that is, thicken it. In addition, if these fibers are damaged