Where does Interstate 37 start and end?

Where does Interstate 37

State Of Texas
Cities Corpus Christi, San Antonio
Summary actually, Interstate 37 is not a proper Interstate, since it does not leave the state of Texas at all. It forms the link between the San Antonio area and northern Texas to the Seaport Corpus Christi. The touristy route is of little importance.
Length 143 Miles
No duty to pay fees

Where does 37 start and end?
Where does Hwy 77 start and end?
How far does 77 go?
When was Hwy 37 built?