Definition
Décorticate rigidity = Abnormal flexion
Abnormal flexor posturing of the extremities, indicative of a lesion in the
cerebral hemispheres or disruption of the corticospinal tracts. The patient exhibits
bilateral adduction of the shoulders, pronation and flexion of the elbows and wrists,
and extension, internal rotation, and plantar flexion of the lower extremities.
Classically associated with lesions that involve the thalamus directly or large
hemispheric masses that compress it from above.
上肢彎曲和內收、兩腳伸直。病灶位於大腦白質、內囊或視丘
Decerebrate posturing = Abnormal extension
In response to painful stimuli the patient exhibits extension, internal rotation, and
wrist flexion in the upper extremities, and extension internal rotation and plantar
flexion in the lower extremities. The jaw may be blenched and neck hyperextended.
Decerebrate rigidity is symmetrical and usually indicates the presence of a lesion in
the midbrain and pons.
Decerebrate posturing generally implies more severe brain dysfunction than
decorticate posturing.
患者呈現角弓反張、牙關緊閉、四肢僵硬伸直、上肢內旋和腳掌向下屈曲。
臨床上病人多見於顳葉鈎回脫出或小腦病灶合併中腦壓迫