Skip to Content

internal capsule

 

Definition: a massive layer (8–10 mm thick) of white matter separating the caudate nucleus and thalamus (medial) from the more laterally situated lentiform nucleus (globus pallidus and putamen). It consists of two gernal fiber populations: fibers ascending from the thalamus to the cerebral cortex that comprise, among others, the visual, auditory, and somatic sensory radiations, and fibers descending from the cerebral cortex to the thalamus, subthalamic region, midbrain, hindbrain, and spinal cord. The internal capsule is the major route by which the cerebral cortex is connected with the brainstem and spinal cord. Laterally and superiorly it is continuous with the corona radiata, which forms a major part of the cerebral hemisphere's white matter; caudally and medially it continues, much reduced in size, as the crus cerebri, which contains, among others, corticospinal fibers. In axial (horizontal) section it appears in the form of a V opening out laterally; the V's obtuse angle is called genu (knee); its anterior and posterior limbs, respectively, the crus anterior and crus posterior. The internal capsule consists of an anterior limb [TA], genu of internal capsule [TA], posterior limb [TA], retrolentiform (or retrolenticular) limb [TA], and sublentiform (or sublenticular) limb [TA].

Synonym(s): capsula internaTA

Disclaimer: This site is designed to offer information for general educational purposes only. The health information furnished on this site and the interactive responses are not intended to be professional advice and are not intended to replace personal consultation with a qualified physician, pharmacist, or other healthcare professional. You must always seek the advice of a professional for questions related to a disease, disease symptoms, and appropriate therapeutic treatments.
© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
Hide