Excelsior class decks
The decks of  Federation starship:

 Deck 1
 Main bridge (, et al.)

 Deck 2
 Observation lounge ( production art)
 Subspace field coil system (in the warp nacelles, extends down to Deck 8) ( production art)

 Deck 3
 Captain's quarters ()

 Deck 5
 Junior officer's quarters ( production art)

 Deck 7
 Officer's quarters ()
 Main sickbay ( production art)

 Deck 8
 Port and starboard computer cores (extends to deck 10) ( production art)

 Deck 10
 Port and starboard main shuttlebays ( production art)

 Deck 12
  Warp reactor core (top level, extends down to Deck 30) ( production art)

 Deck 14
 Lower sensor platform ( production art)

 Deck 15
 Forward photon torpedo launchers ( production art)
 Section 21 alpha: Deflector control room ()

 Deck 19
 Main engineering ( production art)
 Battle bridge ( production art)
 Cargo bays (upper level) ( production art)

 Deck 20
 Cargo bay (aft) ( production art)
 Cargo conveyor (moves cargo between Deck 20 aft and Deck 22) ( production art)

 Deck 21
 Cargo bays ( production art)
 Tractor beam emitter ( production art)

 Deck 23
  Primary nav deflector (extends to deck 25) ( production art)

 Deck 25
  Engineering computer core (extends to deck 29) ( production art)
  Aft photon torpedo launchers ( production art)

 Deck 33
  Antimatter storage ( production art)

 Deck 34
  Antimatter fill port ( production art)
  Antimatter generator ( production art)

Appendices

Background information
Most features here are derived from the Enterprise-B master systems display (MSD) production art, depicting the internal arrangement of all the decks of an Excelsior-class starship with several locations labeled. The graphic was prominently featured in Star Trek Generations on the Enterprise-B bridge set. The legible version of the graphic was published in Star Trek: The Next Generation Sketchbook: The Movies. The MSD was a creation by Scenic Artist Doug Drexler, who recalled, "I enjoyed laying cross sections out, and was proud that Mike [Okuda] thought I was the guy for the job." 

A design for a turbolift control interface okudagram for the Excelsior-class, done at Okuda's scenic art department, turned up later at auction in 2011, that had an alternative deck specification. The graphic listed the decks as follows:
 Deck 1
 Main bridge
 Deck 2
 Upper Sensor Platform
 Junior Officer's QTRS
 Deck 3
 Junior Officer's QTRS
 Deck 4
 Science laboratory
 Environmental Systems
 Sensor Maintenance
 Deck 5
 Upper Computer Core
 Inertial dampening System
 Deck 6
 Gymnasium
 Medical Intensive Care
 Medical Diagnostic Unit
 Dining Rooms 1-3
 Deck 7
 Living Quarters
 Dining Rooms 4-6
The auction description did not specify for which production it was intended, though the configuration of the ship suggested it was intended for either  or the  third season homage episode . An annotation on the design read "Please Shoot 2 Film Negs 100%", indicating that a back-lit translite graphic was actually produced, though it was not seen in either production. Yet, in 1994 a modified (or original) version of the graphic, representing the refit-configuration of the class, was partially seen in the turbolift of the  in the scene where Admiral James T. Kirk enters in order to save the ship in the beginning of , though deck specifications remained unreadable. The original graphic design, measuring 30"×13.5" sold as Lot 228 in Propworx' STAR TREK auction of 4 June 2011 for US$200, having had an estimate of US$100-$200.

Footnote