Serotonergic cell groups

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Serotonergic cell groups
Details
Identifiers
Latin cellulae serotoninergicae
NeuroNames 3137
FMA 78546
Anatomical terminology

Serotonergic cell groups refer to collections of neurons in the central nervous system that have been demonstrated by histochemical fluorescence to contain the neurotransmitter serotonin (5-hydroxytryptamine). [1] Since they are for the most part localized to classical brainstem nuclei, particularly the raphe nuclei, they are more often referred to by the names of those nuclei than by the B1-9 nomenclature. These cells appear to be common across most mammals and have two main regions in which they develop; one forms in the mesencephlon and the rostral pons and the other in the medulla oblongata and the caudal pons. [2]

Contents

Nine serotonergic cell groups have been identified. [3]

B1 cell group

Cell group B1 occupies the midline nucleus raphes pallidus and adjacent structures in the caudal medulla oblongata of the rodent [4] and the primate. [3]

B2 cell group

Cell group B2 occupies the midline nucleus raphes obscurus and adjacent structures in the caudal medulla oblongata of the rodent [4] and the primate. [3]

B3 cell group

Cell group B3 occupies the midline nucleus raphes magnus and adjacent structures in the caudal medulla oblongata of the rodent [4] and the primate. [3] Its boundary with the serotonergic group B1 is indistinct.

B4 cell group

Cell group B4 is located in the floor of the fourth ventricle, in the vicinity of the vestibular nuclei and abducens nucleus in the rat [4] and in the caudal interstitial nucleus of the medial longitudinal fasciculus of the mouse. [5] A comprehensive study of monoaminergic cell groups in the macaque and the squirrel monkey did not identify a B4 cell group distinct from other groups in the region. [3]

B5 cell group

Cell group B5 is located in the midline pontine raphe nucleus and adjacent areas in the rodent [4] and the primate. [3]

B6 cell group

Cell group B6 is located in the floor of the fourth ventricle dorsal to, and between, the right and left medial longitudinal fasciculus of the pons in the primate [3] and the rodent. [4] and forms the caudal portion of the dorsal raphe nucleus.

B7 cell group

Cell group B7 is a group of cells located in the central gray of the pons, the dorsal raphe nucleus and adjacent structures in the primate [3] and the rodent. [4]

B8 cell group

Cell group B8 is located in the dorsal part of the median raphe nucleus (superior central nucleus) and adjacent structures of the pontine reticular formation of the rodent [4] and the primate. [3]

B9 cell group

Cell group B9 is a group of cells located in the pontine tegmentum, ventral to serotonergic group B8. In the nonhuman primate they are found in the ventral part of the superior central nucleus and adjacent structures. [3] In the rodent they have a more lateral location within the medial lemniscus of the pons and dorsal and medial to it., [4] [5]

Related Research Articles

Medulla oblongata structure of the brain stem

The medulla oblongata or simply medulla is a long stem-like structure which makes up the lower part of the brainstem. It is anterior and partially inferior to the cerebellum. It is a cone-shaped neuronal mass responsible for autonomic (involuntary) functions, ranging from vomiting to sneezing. The medulla contains the cardiac, respiratory, vomiting and vasomotor centers, and therefore deals with the autonomic functions of breathing, heart rate and blood pressure as well as the sleep wake cycle.

Pons

The pons is part of the brainstem that in humans and other bipeds lies inferior to the midbrain, superior to the medulla oblongata and anterior to the cerebellum.

Brainstem Posterior part of the brain, adjoining and structurally continuous

The brainstem is the posterior stalk-like part of the brain that connects the cerebrum with the spinal cord. In the human brain the brainstem is composed of the midbrain, the pons, and the medulla oblongata. The midbrain is continuous with the thalamus of the diencephalon through the tentorial notch, and sometimes the diencephalon is included in the brainstem.

Raphe nuclei

The raphe nuclei are a moderate-size cluster of nuclei found in the brain stem. They have 5-HT1 receptors which are coupled with Gi/Go-protein-inhibiting adenyl cyclase. They function as autoreceptors in the brain and decrease the release of serotonin. The anxiolytic drug Buspirone acts as partial agonist against these receptors. Selective serotonin reuptake inhibitor (SSRI) antidepressants are believed to act in these nuclei, as well as at their targets.

Dorsal column–medial lemniscus pathway

The dorsal column–medial lemniscus pathway (DCML) is a sensory pathway of the central nervous system that conveys sensations of fine touch, vibration, two-point discrimination, and proprioception (position) from the skin and joints. It transmits information from the body to the primary somatosensory cortex in the postcentral gyrus of the parietal lobe of the brain. The pathway receives information from sensory receptors throughout the body, and carries this in nerve tracts in the white matter of the dorsal columns of the spinal cord to the medulla, where it is continued in the medial lemniscus, on to the thalamus and relayed from there through the internal capsule and transmitted to the somatosensory cortex. The name dorsal-column medial lemniscus comes from the two structures that carry the sensory information: the dorsal columns of the spinal cord, and the medial lemniscus in the brainstem.

Medial lemniscus

The medial lemniscus, also known as Reil's band or Reil's ribbon, is a large ascending bundle of heavily myelinated axons that decussate in the brainstem, specifically in the medulla oblongata. The medial lemniscus is formed by the crossings of the internal arcuate fibers. The internal arcuate fibers are composed of axons of nucleus gracilis and nucleus cuneatus. The axons of the nucleus gracilis and nucleus cuneatus in the medial lemniscus have cell bodies that lie contralaterally.

Fourth ventricle Ventricle in front of the cerebellum

The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. These cavities, known collectively as the ventricular system, consist of the left and right lateral ventricles, the third ventricle, and the fourth ventricle. The fourth ventricle extends from the cerebral aqueduct to the obex, and is filled with cerebrospinal fluid (CSF).

Reticular formation Spinal trigeminal nucleus

The reticular formation is a set of interconnected nuclei that are located throughout the brainstem. It is not anatomically well defined, because it includes neurons located in different parts of the brain. The neurons of the reticular formation make up a complex set of networks in the core of the brainstem that extend from the upper part of the midbrain to the lower part of the medulla oblongata. The reticular formation includes ascending pathways to the cortex in the ascending reticular activating system (ARAS) and descending pathways to the spinal cord via the reticulospinal tracts.

Olivary body

In anatomy, the olivary bodies or simply olives are a pair of prominent oval structures in the medulla oblongata, the lower portion of the brainstem. They contain the olivary nuclei.

Pontine tegmentum

The pontine tegmentum, or dorsal pons, is located within the brainstem, and is one of two parts of the pons, the other being the ventral pons or basilar part of the pons. The pontine tegmentum can be defined in contrast to the basilar pons: basilar pons contains the corticospinal tract running craniocaudally and can be considered the rostral extension of the ventral medulla oblongata; however, basilar pons is distinguished from ventral medulla oblongata in that it contains additional transverse pontine fibres that continue laterally to become the middle cerebellar peduncle. The pontine tegmentum is all the material dorsal from the basilar pons to the fourth ventricle. Along with the dorsal surface of the medulla, it forms part of the rhomboid fossa – the floor of the fourth ventricle.

Spinocerebellar tract

The spinocerebellar tract is a nerve tract originating in the spinal cord and terminating in the same side (ipsilateral) of the cerebellum.

Dorsal raphe nucleus

The dorsal raphe nucleus is located on the midline of the brainstem and is one of the raphe nuclei. It has rostral and caudal subdivisions.

Lateral hypothalamus

The lateral hypothalamus (LH), also called the lateral hypothalamic area (LHA), contains the primary orexinergic nucleus within the hypothalamus that widely projects throughout the nervous system; this system of neurons mediates an array of cognitive and physical processes, such as promoting feeding behavior and arousal, reducing pain perception, and regulating body temperature, digestive functions, and blood pressure, among many others. Clinically significant disorders that involve dysfunctions of the orexinergic projection system include narcolepsy, motility disorders or functional gastrointestinal disorders involving visceral hypersensitivity, and eating disorders.

Noradrenergic cell group A1 is a group of cells in the vicinity of the lateral reticular nucleus of the medullary reticular formation that label for norepinephrine in primates and rodents. They are found in the ventrolateral medulla in conjunction with the adrenergic cell group C1.

Noradrenergic cell group A2 is a group of cells in the vicinity of the dorsal motor nucleus of the vagus nerve in the medulla that label for norepinephrine in primates and rodents.

Noradrenergic cell group A5 is a group of cells in the vicinity of the superior olivary complex in the pontine tegmentum that label for norepinephine in primates, rodents and other mammals.

Noradrenergic cell group A7 is a group of cells fluorescent for norepinephrine that is located in the pontine reticular formation ventral to the superior cerebellar peduncle of the pons in rodents and in primates.

Dopaminergic cell groups are collections of neurons in the central nervous system that synthesize the neurotransmitter dopamine. In the 1960s, dopamine neurons were first identified and named by Annica Dahlström and Kjell Fuxe, who used histochemical fluorescence. The subsequent discovery of genes encoding enzymes that synthesize dopamine, and transporters that incorporate dopamine into synaptic vesicles or reclaim it after synaptic release, enabled scientists to identify dopaminergic neurons by labeling gene or protein expression that is specific to these neurons.

The parabrachial nuclei, also known as the parabrachial complex, are a group of nuclei in the dorsolateral pons that surrounds the superior cerebellar peduncle as it enters the brainstem from the cerebellum. They are named from the Latin term for the superior cerebellar peduncle, the brachium conjunctivum. In the human brain, the expansion of the superior cerebellar peduncle expands the parabrachial nuclei, which form a thin strip of grey matter over most of the peduncle. The parabrachial nuclei are typically divided along the lines suggested by Baxter and Olszewski in humans, into a medial parabrachial nucleus and lateral parabrachial nucleus. These have in turn been subdivided into a dozen subnuclei: the superior, dorsal, ventral, internal, external and extreme lateral subnuclei; the lateral crescent and subparabrachial nucleus along the ventrolateral margin of the lateral parabrachial complex; and the medial and external medial subnuclei

References

  1. Fuxe K; Hoekfelt T; Ungerstedt U. "Morphological and functional aspects of central monoamine neurons". International Review of Neurobiology. 13: 93–126. doi:10.1016/S0074-7742(08)60167-1.
  2. R. Nieuwenhuys, J. Voogd, C. Van Huijzen, The human central nervous system: a synopsis and atlas (Springer Science & Business Media, 2007).
  3. 1 2 3 4 5 6 7 8 9 10 Felten DL; Sladek JR Jr. (1983). "Monoamine distribution in primate brain V. Monoaminergic nuclei: anatomy, pathways and local organization". Brain Research Bulletin. 10 (2): 171–284. doi:10.1016/0361-9230(83)90045-x. PMID   6839182.
  4. 1 2 3 4 5 6 7 8 9 Dahlstrom A; Fuxe K (1964). "Evidence for the existence of monoamine-containing neurons in the central nervous system". Acta Physiologica Scandinavica. 62: 1–55. PMID   14229500.
  5. 1 2 Paxinos G; Franklin KBJ (2001). The Mouse Brain in Stereotaxic Coordinates (2nd ed.). San Diego: Academic Press. OCLC   493265554.