Start from node A and move upwards to the first branching node. Every node down (except those dominated by A or dominating A) is a B, c-commanded by A.
M-command
Go from node A upwards to the first maximal projection. Every node down from there is a B, m-commanded by A (except nodes dominating A, or dominated by A).
(Haegeman 1991:125)
Government
1) A governs B if A m-commands B and no barrier intervenes between A and B.
2) Maximal projections except infinitival IP are barriers to government.
3) Governors are lexical nodes V, N, P, A and tensed I.
(Haegemann 1991: 125)
Principle of Reflexive Binding
A reflexive must be bound in the minimal domain containing it, its governor and a subject.