What is Tuberoinfundibular?

Tuberoinfundibular pathway is one of the major dopamine pathways in the brain originating from hypothalamus. The release of dopamine in this pathway regulates prolactin secretion by the pituitary gland.

What are characteristics of tuberoinfundibular pathway?

The tuberoinfundibular pathway: cell bodies are located in the arcuate nucleus in the hypothalamus, and the axons project to the median eminence. In this system, dopamine acts as a modulator of the hypothalamic–pituitary axis (for example, it inhibits prolactin secretion).

How does tuberoinfundibular pathway work?

The tuberoinfundibular pathway transmits dopamine from the arcuate nucleus (aka “infundibular nucleus”) of the hypothalamus to the pituitary gland via dopamine release into the median eminence and subsequent circulation through the hypophyseal portal system.

How does excess dopamine cause schizophrenia?

The positive symptoms of schizophrenia include hallucinations and delusions as a result of increased subcortical release of dopamine, which augments D2 receptor activation (15), and are thought to be due to a disturbed cortical pathway through the nucleus accumbens (16).

What is the nigrostriatal pathway?

Anatomical terminology The nigrostriatal pathway is a bilateral dopaminergic pathway in the brain that connects the substantia nigra pars compacta (SNc) in the midbrain with the dorsal striatum (i.e., the caudate nucleus and putamen) in the forebrain.

What is the purpose of nigrostriatal pathway?

Function. The main function of the nigrostriatal pathway is to influence voluntary movement through basal ganglia motor loops. Along with the mesolimbic and mesocortical dopaminergic pathways the nigrostriatal dopamine pathway can also influence other brain functions including cognition, reward and addiction.

Does dopamine have a role in schizophrenia?

Brain Messenger Chemicals It also plays a role in other psychiatric and movement disorders, like Parkinson’s disease. In schizophrenia, dopamine is tied to hallucinations and delusions. That’s because brain areas that “run” on dopamine may become overactive. Antipsychotic drugs stop this.

Is schizophrenia too much dopamine?

Most of these studies have focused on the neurotransmitter called dopamine. The “dopamine theory of schizophrenia” states that schizophrenia is caused by an overactive dopamine system in the brain.

What is the tuberoinfundibular pathway?

The tuberoinfundibular pathway is one of the major dopamine pathways in the brain originating from the hypothalamus. The release of dopamine in this pathway regulates prolactin secretion by the pituitary gland.

How do antipsychotic drugs affect the tuberoinfundibular pathway?

Tuberoinfundibular pathway. Some antipsychotic drugs block dopamine in the tuberoinfundibular pathway, which can cause an increase in blood prolactin levels ( hyperprolactinemia ). This can cause abnormal lactation (even in men), disruptions to the menstrual cycle in women, visual problems, headache and sexual dysfunction .

What happens when tuberoinfundibular dopamine is blocked?

A decrease or blockade of tuberoinfundibular dopamine results in elevated prolactin levels and, as a result, galactorrhea, ammenorrhea, and reduced libido. Open in a separate window Figure 1 Pathophysiology of Schizophrenia4,5