The bulb is an archaic term for the medulla oblongata and in modern clinical usage the word bulbar (as in bulbar palsy) is retained for terms that relate to the medulla oblongata, particularly in reference to medical conditions.
Pi is transcendental. The endless number cannot be expressed by any algebraic equation. No pattern has been found in its digits, Yet it cannot be proven in a finite amount of time. That no pattern exists in an infinite number of digits. Pi goes beyond our reality.
For a while, it was thought that 22/7 was pi, but it was later proved that pi is irrarional: it has no fractional expression. Pi cannot be a fraction but 22/7 is a good approximation. 22/7 = 3.1428; the first 2 digits to the right of the point are correct. 22/7 is very close to pi. Otherwise, pi is an irrational number and cannot be expressed as a fraction. I hope that helps.