Admin Table of Contents
What separates the thalamus?
The inferior surface of the thalamus is connected to the anterior portion of the hypothalamus and the posterior portion of the subthalamus. The subthalamus is what separates the thalamus from the tegmentum of the midbrain.
What separates the two Thalami?
The grey matter of the thalamus is separated by a Y-shaped layer of white matter called the internal medullary lamina. This structure divides the thalamus into anterior, medial and lateral parts.
What are the 3 parts of the diencephalon?
3 Diencephalon. The diencephalon, derived from the prosencephalon and located between the cerebral cortex and brainstem, is a paired structure subdivided into the thalamus, ventral thalamus, hypothalamus, and epithalamus (Bear & Paradiso, 2007).
What is the thalamus made up of?
The thalamus is mostly comprised of grey matter but is also surrounded by two layers of white matter. The thalamus is made up of different types of nuclei, each of which serve a unique purpose, from relaying sensory and motor signals to the regulation of consciousness and alertness.
What structures is the thalamus near?
Structure and Function The thalamus is a paired gray matter structure of the diencephalon located near the center of the brain. It is above the midbrain or mesencephalon, allowing for nerve fiber connections to the cerebral cortex in all directions — each thalamus connects to the other via the interthalamic adhesion.
What is the thalamus surrounded by?
The thalamus is surrounded by two thin layers of white matter. On its superior surface, it is covered by the stratum zonale and on its lateral surface by the external medullary lamina. The grey matter of the thalamus is separated by a Y-shaped layer of white matter called the internal medullary lamina.
What structures are near the thalamus?
The ventral region, composed of the nucleus reuniens, is a limbic relay station. It has input from limbic structures (limbic cortex, amygdala), from the basal forebrain, and from the hypothalamus and has strong efferent outputs to the hippocampus, limbic cortex, prefrontal cortex, insula, and amygdala.
Is thalamus part of brainstem?
The brainstem is made up of all the unpaired structures that connect the cerebrum with the spinal cord. Most rostral in the brainstem are structures often collectively referred to as the diencephalon. These structures are the epithalamus, the thalamus, the hypothalamus, and the subthalamus.
Is the thalamus part of the cortex?
The thalamus is a small structure within the brain located just above the brain stem between the cerebral cortex and the midbrain and has extensive nerve connections to both. The primary function of the thalamus is to relay motor and sensory signals to the cerebral cortex.
What are the different parts of the thalamus?
The thalamus is divided into three main divisions or sections: the anterior, medial, and lateral parts. Injury or damage to the thalamus can produce a host of sensory perception problems.
What is the relationship between the thalamus and the diencephalon?
Relations. The thalamus is an egg shaped mass of grey matter which forms a major part of the diencephalon, the latter being the posterior part of the prosencephalon or forebrain. There are two thalami in total, one situated on each side of the third ventricle (a cerebrospinal fluid filled cavity).
What divides thalamus from midbrain tegmentum?
The subthalamus divides thalamus from the midbrain tegmentum. Anterior end or Pole: It constitutes the posterior boundary of interventricular foramen. Posterior end or pole: Posterior end of the thalamus is designated as the Pulvinar.
How are the thalamus and interthalamic adhesion connected?
They are connected by a band of grey matter called the interthalamic adhesion. Each side of the thalamus is divided into three main areas that each contain a collection of nuclei which are explained in the sections to follow;