What is the ansa lenticularis?
The ansa lenticularis (ansa lentiformis in older texts) is a part of the brain, making up the superior layer of the substantia innominata.
What does the internal capsule consist of?
The internal capsule (IC) is a white matter structure composed of bundles of myelinated fibers that course past the basal ganglia. It is located in the inferomedial portion of each cerebral hemisphere and separates the caudate nucleus and thalamus from the lentiform nucleus.
What are Pallido fugal fibers?
Nerve fibers that conduct impulses from the globus pallidus across the internal capsule and fields of Forel to the thalamus and nearby areas. The pallidofugal and striatonigral fiber tracts form a functional part of the basal ganglionic neuronal networks.
What is lenticular fasciculus?
The lenticular fasciculus is a tract connecting the globus pallidus (internus) to the thalamus and is a part of the thalamic fasciculus. It is synonymous with field H2 of Forel. Basically, it is part of a pathway that connects the globus pallidus and the thalamus.
What is Field of Forel?
The fields of Forel are areas in a deep part of the brain known as the diencephalon. They are below the thalamus and consist of three defined, white matter areas of the subthalamus. These three regions are also named “H fields”: The grey matter from this field is said to form a prerubral nucleus.
What fibers are in the internal capsule?
The internal capsule is a deep subcortical structure that contains a concentration of afferent and efferent white matter projection fibers. Anatomically, this is an important area because of the high concentration of both motor and sensory projection fibers 1,2.
What is the internal capsule responsible for?
The internal capsule describes a region deep in the brain that functions as a communication pathway. The internal capsule allows communication between areas of the cerebral cortex and areas of the brainstem.
What is Pallidothalamic tract?
The pallidothalamic tracts (or pallidothalamic connections) are a part of the basal ganglia. They provide connectivity between the internal globus pallidus (GPi) and the thalamus, primarily the ventral anterior nucleus and the ventral lateral nucleus.
What is thalamic fasciculus?
The thalamic fasciculus is a component of the subthalamus. The thalamic fasciculus consists of the joint fibers of the ansa lenticularis and the lenticular fasciculus, coming from different portions of the medial globus pallidus, before they jointly enter the ventral anterior nucleus of the thalamus.
What does Lentiform mean?
1. lentiform – convex on both sides; shaped like a lentil. biconvex, convexo-convex, lenticular. bulging, convex – curving or bulging outward.