Final answer:
Placing a hand on the fetal head and applying gentle pressure during emergency delivery serves to facilitate the baby's descent, guide the baby through the birth canal, and expedite the delivery process.
Step-by-step explanation:
During an emergency delivery, placing a hand on the fetal head and applying gentle pressure serves several purposes. One reason is to facilitate the baby's descent through the birth canal, helping the baby move downwards. Another reason is to guide the baby through the birth canal, ensuring a smooth passage. Lastly, applying gentle pressure on the fetal head can help expedite the delivery process by providing additional support and guidance.