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The internal capsule is a white matter structure situated in the inferomedial part of each cerebral hemisphere of the brain. It carries information past the basal ganglia, separating the caudate nucleus and the thalamus from the putamen and the globus pallidus. The internal capsule contains both ascending and descending axons. The internal capsule contains fibres going to and coming from the cerebral cortex. The corticospinal tract constitutes a large part of the internal capsule, carrying motor information from the primary motor cortex to the lower motor neurons in the spinal cord. Above the basal ganglia the corticospinal tract is a part of the corona radiata, below the basal ganglia the tract is called crus cerebri (a part of the cerebral peduncle) and below the pons it is referred to as the corticospinal tract. ==Structure== The internal capsule is V-shaped when cut horizontally, in a transverse plane. When cut horizontally: * the bend in the V is called the ''genu'' * the ''anterior limb'' or ''crus anterius'' is the part in front of the genu, between the head of the caudate nucleus and the lenticular nucleus * the ''posterior limb'' or ''crus posterius'' is the part behind the genu, between the thalamus and lenticular nucleus * the ''retrolenticular portion'' is caudal to the lenticular nucleus and carries the optic radiation also known as the ''geniculocalcarine tract'' * the ''sublenticular portion'' is beneath the lenticular nucleus and are tracts involved in the auditory pathway from the medial geniculate nucleus to the primary auditory cortex (Brodmann areas 41 and 42) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Internal capsule」の詳細全文を読む スポンサード リンク
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