Final answer:
The dorsiflexion of the great toe and fanning of other toes, known as the Babinski sign, indicates damage to the corticospinal tract in adults or can be normal in children under two.
Step-by-step explanation:
The dorsiflexion of the great toe and fanning of the other toes is known as the Babinski sign. This response occurs when the sole of the foot is stroked and is a part of the plantar reflex. In adults, the presence of the Babinski sign can indicate damage to the corticospinal tract, since this reflex is usually suppressed by corticospinal input. Children under the age of two may normally exhibit this response as their neural pathways have not yet fully myelinated.