An unintegrated STNR (Symmetrical Tonic Neck Reflex) affects which motor behavior?

Prepare for the MCML Assessment and Treatment of Abnormal Muscle Tone Exam. Study with flashcards and multiple choice questions, with hints and explanations for each question. Ace your exam with confidence!

Multiple Choice

An unintegrated STNR (Symmetrical Tonic Neck Reflex) affects which motor behavior?

Explanation:
An unintegrated Symmetrical Tonic Neck Reflex disrupts the coordinated arm–leg pattern needed for crawling. The reflex ties head position to limb tone: when the head is flexed, the arms tend to flex and the legs extend; when the head is extended, the arms extend and the legs flex. If this pattern remains active, it interferes with the reciprocal, on-hands-and-knees movements required for crawling, making that motor behavior particularly difficult. Sits, walks, or runs can still develop with other strategies, but crawling is the one most impacted by an unintegrated STNR.

An unintegrated Symmetrical Tonic Neck Reflex disrupts the coordinated arm–leg pattern needed for crawling. The reflex ties head position to limb tone: when the head is flexed, the arms tend to flex and the legs extend; when the head is extended, the arms extend and the legs flex. If this pattern remains active, it interferes with the reciprocal, on-hands-and-knees movements required for crawling, making that motor behavior particularly difficult. Sits, walks, or runs can still develop with other strategies, but crawling is the one most impacted by an unintegrated STNR.

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