What is the name of the primary opening at the base of the skull that allows pressure to be released?

The primary opening at the base of the skull that allows for the release of pressure is known as the foramen magnum. This large opening is located in the occipital bone and serves as the pathway for the spinal cord as it exits the skull and connects to the brain. The foramen magnum is crucial because it facilitates communication between the central nervous system and the brain, while also allowing for the passage of blood vessels and nerves.

Additionally, the foramen magnum plays a significant role in maintaining intracranial pressure. Any changes in pressure within the cranial cavity can be vented through this opening, which is vital for preventing conditions like herniation, where brain tissue could shift due to excess pressure. The other options referenced in the question do not serve the same function: the cribriform plate is involved in the sense of smell, the occipital condyles articulate with the first cervical vertebra, and the mandibular notch is part of the jaw structure. Therefore, the foramen magnum is the correct choice because of its essential function in both structural support and pressure regulation at the base of the skull.