nucleus ambiguus

The nucleus ambiguus is classically said to provide the "cranial component" of the accessory nerve.

Medical Neurosciences discuss the nucleus ambiguus.

The nucleus ambiguus, which form the special visceral efferent (SVE).

The cell bodies for the preganglionic parasympathetic vagal neurons that innervate the heart reside in the nucleus ambiguus.

This is in line with the observation that the spinal accessory nucleus appears to be continuous with the nucleus ambiguus of the medulla.

The corticobulbar tract also contributes to the motor regions of nerves IX and X in the nucleus ambiguus.

Mice with null mutations ("knockouts") in Brn3a die at birth, due to developmental defects in the nucleus ambiguus, which is essential for respiration.

The ventral branch of the vagus originates in the nucleus ambiguus and is myelinated to provide more control and speed in responding.

The branchial motor component originates from the nucleus ambiguus in the reticular formation of the medulla Rostral medulla.

As well as motor neurons, the nucleus ambiguus in its "external formation" contains cholinergic preganglionic parasympathetic neurons for the heart.

The external formation of the nucleus ambiguus also sends bronchoconstrictor fibers to the bronchopulmonary system, which can produce reflexive decreases in pulmonary bronchial airflow.

Heart rate is normally controlled by multiple centers in the brainstem; one of these centers, the nucleus ambiguus, increases parasympathetic nervous system input to the heart via the vagus nerve.

This area is a bit below the autonomic motor nuclei, and includes the nucleus ambiguus, facial nerve nucleus, as well as the motor part of the trigeminal nerve nucleus.

The lateral horn of high cervical segments appears to be continuous with the nucleus ambiguus of the medulla oblongata, from which the cranial component of the accessory nerve is derived.

Fibers leaving the nucleus ambiguus travel anteriorly and laterally to exit the medulla, along with the other components of CN IX, between the olive and the inferior cerebellar peduncle.

The NTS also sends excitatory fibers to the Nucleus ambiguus (vagal nuclei) that regulate the parasympathetic nervous system, aiding in the decrease in sympathetic activity during conditions of elevated blood pressure.

The cranial root fibers arise from the cells of the nucleus ambiguus and emerge as four or five delicate rootlets from the side of the medulla oblongata, below the roots of the vagus.

Additional cell bodies are found in the nucleus ambiguus, which give rise to the branchial efferent motor fibers of the vagus nerve (CN X) terminating in the laryngeal, pharyngeal muscles, and musculus uvulae.

Preganglionic motor fibres (ganglionic branches) from the dorsal vagal nucleus and the special visceral efferents from the nucleus ambiguus, which descend to the inferior vagal ganglion form a band skirting the ganglion.

Its precise location in humans has not yet been identified, but in other mammals it is located in the medulla within the general visceral efferent cell column, superior to the nucleus ambiguus and inferior to the superior salivatory nucleus.

Preganglionic parasympathetic neurons are in the medulla oblongata (forming visceral motor nuclei: the dorsal motor nucleus of the vagus nerve (dmnX), the nucleus ambiguus, and the salivatory nuclei), and in the sacral spinal cord.

Friedland, D.R., Eden, A.R., and Laitman, J.T. (1995) Naturally occurring motoneuron cell death in rat upper respiratory tract motor nuclei: A histological, fast DiI and immunocytochemical study in the nucleus ambiguus.

Because it innervates muscles derived from pharyngeal arches, the facial motor nucleus is considered part of the special visceral efferent (SVE) cell column, which also includes the trigeminal motor nucleus, nucleus ambiguus, and (arguably) the spinal accessory nucleus.

In the cerebellum, the PICA supplies blood to the posterior inferior portion of the cerebellum, the inferior cerebellar peduncle, the nucleus ambiguus, the vagus motor nucleus, the spinal trigeminal nucleus, the solitary nucleus, and the vestibulocochlear nuclei.

In addition to sensory neurons, in rodents and birds (and presumably humans) Brn3a is expressed in multiple sites in the central nervous system, including the spinal cord, midbrain superior colliculus, red nucleus, nucleus ambiguus, inferior olivary nucleus, habenula, and retina.