What is the massa intermedia?

What is the massa intermedia?

The massa intermedia (MI), also called the adhesio interthalamica, links the paired thalami across the midline of the third ventricle. [22] The MI is located at the medial surface of the thalamus, posterior to the foramen of Monro and anterior commissure (AC), and anterior to the posterior and habenular commissure.

What is the massa intermedia brain?

The interthalamic adhesion (ITA) or massa intermedia is a small variably present connection between the medial apposing surfaces of the two thalami that passes through the third ventricle. It is not a commissure as once thought as it does not contain neurones; instead, it is composed of glial tissue.

Is the massa intermedia part of the thalamus?

massa intermedia. The massa intermedia (MI) is a normal midline transventricular thalamic link that develops around 13–17 weeks’ gestational age. It is not considered a commissure because no reciprocal interhemispheric connections have been found within it in humans.

What is the interthalamic adhesion?

The interthalamic adhesion (ITA) is an understudied neuroanatomical structure that forms a bridge of tissue connecting the thalamus of each hemisphere across the midline whose functional significance remains largely unknown.

What vesicle of the brain is the Interthalamic adhesion part of?

The dorsal thalamus on each side of the third ventricle increases rapidly in size and, in about 80% of patients, will partially fuse across the space of the third ventricle to form the massa intermedia or interthalamic adhesion (Figs. 15.2 to 15.4).

What is the fornix of the brain?

The fornix is a white matter bundle located in the mesial aspect of the cerebral hemispheres, which connects various nodes of a limbic circuitry and is believed to play a key role in cognition and episodic memory recall.

Is the fornix white or gray matter?

The fornix is a white matter tract bundle located on the medial aspects of the cerebral hemispheres. Components of the fornix lie to either side of the midsagittal plane and connect with each other across that plane.

Is the fornix part of the brain?

The fornix (plural: fornices) is the main efferent system of the hippocampus and an important part of the limbic system. It is one of the commissural fibers connecting the cerebral hemispheres.

What is the meaning of the double massa intermedia?

Background: To describe the rare finding of a double massa intermedia (MI). Typically, the MI (interthalamic adhesion) is a single bridge of gray matter connecting the medial surfaces of the thalami.

How is the massa intermedia related to age?

In the 46 of 74 cases-men and women-who had a massa intermedia, its area on lateral X-ray views shrank with age and was correlated with these factor scores.

Where is the massa intermedia located in the brain?

THE BAND of neural tissue across the third ventricle, connecting parts of the two halves of the primate thalamus, is known as the massa intermedia (MI), and it is inexplicably absent from the brain in about a third of men and a quarter of women [1].

How does massa intermedia affect the IQ test?

Male neurological patients with a massa intermedia had relatively lower nonverbal factor scores on the Wechsler-Bellevue IQ test than those without this thalamic structure. This slight impairment, associated with the presence of the structure, was not found with female patients.