Callosal disconnection and limb-kinetic apraxia.
Neurocase
; 20(6): 599-605, 2014.
Article
em En
| MEDLINE
| ID: mdl-23972140
ABSTRACT
According to Liepmann, patients with limb-kinetic apraxia (LKA) have a loss of upper limb deftness-dexterity. Prior studies have revealed in right-handed patients that, whereas injury of the left hemisphere induces an ipsilesional LKA, injury to the right hemisphere does not induce an ipsilesional LKA. There are at least two possible means by which the left hemisphere may influence the deftness of the left hand, either by callosal connections or by ipsilesional corticospinal projections. The purpose of this study was to learn whether a patient with a focal lesion of the corpus callosum had a callosal disconnection LKA. This 57-year-old right-handed man had a memory impairment, and upon brain imaging, was found to have a septum pellucidum cyst, which was causing mild ventricular obstruction to the occipital and temporal horns. He underwent an endoscopic-assisted fenestration of the septum pellucidum. Postoperative imaging revealed a lesion of the mesial portion of his corpus callosum and an assessment of praxis revealed that he had both a limb-kinetic and ideomotor apraxia of his left but not his right hand. The observation that this man had a callosal disconnection LKA of his left hand suggests that in some people it is the left hemisphere's premotor or motor cortex that enables the right hemisphere's motor system to program deft movements of the left hand.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Corpo Caloso
/
Apraxia Ideomotora
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Lateralidade Funcional
Limite:
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Neurocase
Assunto da revista:
CIENCIAS DO COMPORTAMENTO
/
NEUROLOGIA
/
PSICOLOGIA
/
PSIQUIATRIA
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Estados Unidos