menu-bar-buffers-menu-command-entries

menu-bar-buffers-menu-command-entries is a variable defined in `menu-bar.el'.
Its value is

((command-separator "--")
 (next-buffer menu-item "Next Buffer" next-buffer :help "Switch to the \"next\" buffer in a cyclic order")
 (previous-buffer menu-item "Previous Buffer" previous-buffer :help "Switch to the \"previous\" buffer in a cyclic order")
 (select-named-buffer menu-item "Select Named Buffer..." switch-to-buffer :help "Prompt for a buffer name, and select that buffer in the current window")
 (list-all-buffers menu-item "List All Buffers" list-buffers :help "Pop up a window listing all Emacs buffers"))

Documentation:
Not documented as a variable.