Which neuromuscular finding suggests more advanced gestational age in a neonate?

Which neuromuscular finding suggests more advanced gestational age in a neonate?

• A. Increased hip flexion and adduction
• B. Increased extensor tone
• C. Decreased alertness
• D. Weak neonatal reflexes

Answer: (A)

Neuromuscular maturity increases with gestational age, and the pattern of limb tone and posture reflects how developed the infant’s CNS and muscles are. As a fetus matures, flexor tone in the limbs becomes more prominent, leading to a more curled, flexed position of the hips and legs. Therefore, increased hip flexion and adduction indicate a higher level of neuromuscular maturity, which corresponds to more advanced gestational age. In contrast, predominance of extensor tone tends to be seen in less mature, more premature infants, and while decreased alertness or weak neonatal reflexes can occur with immaturity or illness, they do not specifically signal more advanced gestational age.

Neuromuscular maturity increases with gestational age, and the pattern of limb tone and posture reflects how developed the infant’s CNS and muscles are. As a fetus matures, flexor tone in the limbs becomes more prominent, leading to a more curled, flexed position of the hips and legs. Therefore, increased hip flexion and adduction indicate a higher level of neuromuscular maturity, which corresponds to more advanced gestational age.

In contrast, predominance of extensor tone tends to be seen in less mature, more premature infants, and while decreased alertness or weak neonatal reflexes can occur with immaturity or illness, they do not specifically signal more advanced gestational age.