Library · Anatomy
Thalamus
Make it clearer
The thalamus is not one uniform piece. It is made of nuclei, clusters of neurons with different jobs, ranging from passing along signals from the senses and from movement to contributing to consciousness and alertness.
The name of its neurons tells you what they do: thalamocortical, from the thalamus to the cortex. They take in information from the rest of the body and pass only a selection of it on to the cerebral cortex, the layer where information is processed. Not everything gets through.
There is a rule with almost no exceptions: each sense has its own nucleus. The lateral geniculate nucleus receives visual input from the retina, and the medial geniculate nucleus receives auditory input. The only one that skips this relay is smell.
Picture a sorting hub where every incoming line has its own platform and its own destination. The thalamus sits just above the midbrain, with fibers running out to the cortex in every direction.
In brief
The thalamus is made up of distinct nuclei: some relay sensory and motor signals, others regulate consciousness.
Its thalamocortical neurons take in information from the body and pass only a selection on to the cerebral cortex.
Every sense except smell has its own nucleus: the lateral geniculate receives visual input from the retina and the medial geniculate receives auditory input.
A sorting hub where every incoming line has its own platform and its own destination.
It sits above the midbrain and connects to the cortex in every direction.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingNeuroanatomy, Thalamus, StatPearlsPublished
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
Updated