Final answer:
A small opening in bone that allows the passage of nerves and/or blood vessels is called a foramen.
Step-by-step explanation:
A small opening in bone that allows the passage of nerves and/or blood vessels is called a foramen.
For example, the nutrient foramen is a small opening in the middle of the external surface of the diaphysis, through which an artery enters the bone to provide nourishment.
Other examples of foramina include the foramen magnum, which is a large opening that allows the spinal cord and brain to connect, and the foramen lacerum, an irregular opening located in the base of the skull.