Medical Definition of Internal capsule

1. A massive layer (8 to 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 1) fibres ascending from the thalamus to the cerebral cortex that compose, among others, the visual, auditory, and somatic sensory radiations, and 2) fibres 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, the pyramidal tract. On 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. Synonym: capsula interna. (05 Mar 2000)

Lexicographical Neighbors of Internal Capsule

internal arcuate fibres
internal attachment
internal auditor
internal auditory artery
internal auditory canal
internal auditory foramen
internal auditory meatus
internal auditory vein
internal auditory veins
internal axis of eye
internal base of skull
internal bias
internal branch of accessory nerve
internal branch of superior laryngeal nerve
internal canthus
internal capsule (current term)
internal capsule syndrome
internal carotid (nervous) plexus
internal carotid artery
internal carotid nerve
internal carotid venous plexus
internal cerebral vein
internal cerebral veins
internal collateral ligament of the wrist
internal combustion
internal combustion engine
internal conflict
internal control

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