2 adjectives to describe connects

The vestibule is the common cavity with which all the other portions of the labyrinth connect.

Relative pronouns in the nominative or [the] objective case, are preceded by commas, when the clause which the relative connects [,] ends a sentence; as, 'Sweetness of temper is a quality, which reflects a lustre on every accomplishment'B. Greenleaf.'

2 adjectives to describe  connects