Decorticate vs. Decerebrate Posturing: Understanding Neurological Damage

Upper Body and Arms

The defining feature of decorticate posturing is the position of the arms. In this state, the arms are bent and pulled inward toward the center of the body. The wrists are typically curled, and the hands are tightly balled into fists that are held against the chest.

Lower Body and Feet

While the upper body flexes, the lower body remains quite different. The legs are characterized by rigid extended legs. Furthermore, the feet exhibit a specific orientation where the toes are pointed and turned inward toward one another.

Clinical Note: The term "decorticate" comes from the Latin cortex, referring to the cerebral cortex. This posturing often suggests damage to the area above the brainstem, such as the cerebral hemispheres.

Decerebrate Posturing: The "Extended" Response

Decerebrate posturing represents a more severe neurological state. Unlike the inward pulling seen in decorticate posturing, decerebrate posturing presents as an "extended" appearance throughout the entire body.

Upper Body and Arms

In decerebrate posturing, the arms are not pulled to the chest. Instead, they are held straight and tense, positioned parallel to the sides of the body. While the arms are extended, there is still specific movement in the extremities: the wrists undergo wrist flexion, and the fingers are curled.

Lower Body and Feet

The lower body presentation in decerebrate posturing is remarkably similar to decorticate posturing. The legs remain rigid and fully extended, and the toes are pointed and turned inward toward each other.

Exam Tip: If you see a patient with arms held straight at their sides (extension) rather than pulled to their chest (flexion), immediately think "Decerebrate." Decerebrate is generally considered a more ominous sign of brainstem involvement.

Summary Comparison Table

To help differentiate these two critical clinical signs, use the following comparison based on the anatomical regions:

By focusing on the upper body/arms—specifically whether they are flexed toward the chest or extended at the sides—clinicians can quickly distinguish between these two types of neurological distress.