This article includes a list of general
references, but it lacks sufficient corresponding
inline citations. (April 2012) |
This article relies largely or entirely on a
single source. (April 2012) |
Perihypoglossal nuclei (nuclei perihypoglossales), also perihypoglossal complex, perihypoglossal nuclear complex or satellite nuclei, is a group of
neurons in the floor of the
fourth ventricle, close to the
nucleus of the hypoglossal nerve in the gray substance of the
medulla oblongata, all of which contain cells with characteristics suggestive of
reticular connections.
The complex includes three
nuclei: the
intercalated nucleus, the
nucleus prepositus, and the
sublingual nucleus. The nucleus prepositus is the largest of the three.
Perihypoglossal nuclei receive afferents from the cerebral cortex, vestibular nuclei, accessory oculomotor nuclei, and paramedian pontine reticular formation. Efferent fibers of these nuclei terminates in cranial nerve nuclei involved in extraocular movement (oculomotor, trochlear, abducens), the cerebellum, and the thalamus. The perihypoglossal nuclei and their connections are part of a complex circuitry related to eye movements. Lesions in the nucleus prepositus impair the ability to keep the eyes fixed on a visual target, although conjugate movements are still performed accurately.
This article includes a list of general
references, but it lacks sufficient corresponding
inline citations. (April 2012) |
This article relies largely or entirely on a
single source. (April 2012) |
Perihypoglossal nuclei (nuclei perihypoglossales), also perihypoglossal complex, perihypoglossal nuclear complex or satellite nuclei, is a group of
neurons in the floor of the
fourth ventricle, close to the
nucleus of the hypoglossal nerve in the gray substance of the
medulla oblongata, all of which contain cells with characteristics suggestive of
reticular connections.
The complex includes three
nuclei: the
intercalated nucleus, the
nucleus prepositus, and the
sublingual nucleus. The nucleus prepositus is the largest of the three.
Perihypoglossal nuclei receive afferents from the cerebral cortex, vestibular nuclei, accessory oculomotor nuclei, and paramedian pontine reticular formation. Efferent fibers of these nuclei terminates in cranial nerve nuclei involved in extraocular movement (oculomotor, trochlear, abducens), the cerebellum, and the thalamus. The perihypoglossal nuclei and their connections are part of a complex circuitry related to eye movements. Lesions in the nucleus prepositus impair the ability to keep the eyes fixed on a visual target, although conjugate movements are still performed accurately.