What is the ansa lenticularis?
Anatomical terms of neuroanatomy 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 ansa lenticularis connect?
The thalamic fasciculus (composed of both the lenticular fasciculus and ansa lenticularis) runs to the thalamus. Basically, it is part of a pathway that connects the globus pallidus and the thalamus. Lesions in this area can result in dyskinesias such as chorea-like movements.
What is thalamic fasciculus?
The thalamic fasciculus is a component of the subthalamus. It is synonymous with field H1 of Forel. Nerve fibres form a tract containing cerebellothalamic (crossed) and pallidothalamic (uncrossed) fibres, that is insinuated between the thalamus and the zona incerta.
What is the 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 does the internal capsule do?
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.
Is fasciculus plural or singular?
fasciculus (plural fasciculi) (anatomy) A small bundle of nerve, muscle or tendon fibers.
What is Field of Forel?
The field of Forel (FF) is a subthalamic area through which the pallidothalamic tracts originating from the globus pallidus internus (GPi) traverse. The FF was used as a stereotactic surgical target (ablation and stimulation) to treat cervical dystonia in the 1960s and 1970s.
What happens if the internal capsule is damaged?
Damage to this area can affect functions like speaking, chewing, and swallowing. As a result, individuals may struggle to swallow (dysphagia), have difficulty with eating, and/or struggle with speech (dysarthria and other motor speech disorders) after an internal capsule stroke.
What does lentiform mean?
1. lentiform – convex on both sides; shaped like a lentil. biconvex, convexo-convex, lenticular. bulging, convex – curving or bulging outward.
The ansa lenticularis ( ansa lentiformis in older texts) is a part of the brain, making up the superior layer of the substantia innominata. Its fibers, derived from the medullary lamina of the lentiform nucleus, pass medially to end in the thalamus and subthalamic region, while others are said to end in the tegmentum and red nucleus .
Where does the lenticular fasciculus pass through the internal capsule?
The lenticular fasciculus leaves the globus pallidus, passes through the posterior limb of the internal capsule at right angles to most fibers in the posterior limb, and forms a thin sheet of fibers insinuated between the subthalamic nucleus and the zona incerta.
Is the lentiform lamina part of the thalamus?
Its fibers, derived from the medullary lamina of the lentiform nucleus, pass medially to end in the thalamus and subthalamic region, while others are said to end in the tegmentum and red nucleus . It is classified by NeuroNames as part of the subthalamus .