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What purpose would there be to have the chief medical officer on the bridge? It seems like she would not have any use while there. All of her tools and medical equipment were in Sick Bay and the transports can transport anyone into Sick Bay directly.
If she's on the bridge, how is she helpful if there's an emergency?
It wasn't a "Crusher Chair." There were two extra seats without backs beside the seats for the First Officer and the Counselor, but I don't see any reason to think it was only for Crusher. I would think if those seats were meant for specific officers, they'd be full seats with backs and arms.
ADDITION: Just for completeness, I left this question tabbed until I could look it up in the Star Trek: The Next Generation Writer's/Directors Technical Guide. This is the guide sent to me by Lolita Fatjo, the script supervisor for ST:TNG when I was invited to pitch stories to the series. It is the manual all writers would receive to make sure they're clear about the characters and situations in the series. This would be the version used for the 5th season, but there were points in there that made me suspect it had not been revised for a few seasons.
On Page 39, under Layout of The Main Bridge Set, it states: "The COMMAND AREA of our Main Bridge is a semi-circle of control seats where the Captain and his next-in-command and advisors are located."
Just adding that for the record. So, other than for the 1st Officer, they don't specify any assignment for the seats, just that they're there for advisors. (In other words, "put any character there who needs to be there for that scene.")
Apologies for adding this so late, but I didn't have time to dig out the Writer's Guide until this evening.
She held the rank of Commander and as such, only the Captain out ranked her. She didn't spend a lot of time on the bridge, but when she did, you're not going to make a Commander sit on the floor.
That being said, often there wasn't a whole lot going on in sickbay and if they wanted to make use of the actress they needed to have her with the rest of the cast. I seem to remember Bones wandering around a bit in TOS.
It's mentioned in a few episodes, but not many; Dr. Crusher, as a Commander, is actually the third-ranking officer on the Enterprise until Troi's field promotion to Commander, and (until that time) fourth in the established chain of command behind Data (who, though only a LtC, doesn't need sleep and so is a convenient choice for the third watch). Troi pursues her field promotion to Commander after having watched Dr Crusher take a night watch with Data absent, during the episode "Thine Own Self".
As such, Dr Crusher has every right to the left-hand chair that Troi usually takes; however, as her place is more often in sickbay, while Troi is more often on the bridge as an advisor, Crusher usually concedes and takes one of the more benchlike seats to the sides of the command chairs when she is on the bridge.
The Galaxy class' diplomatic and large scale operations on board the ship has seating for various functions including VIP, Admirals, additional mission specialists, guests, etc. The Set design of the Bridge was changed subtly over the seasons, sometimes by the various episodes but additional seating has been included or removed over the series run. It wasn't until the third season the changes ceased. In the first season pilot they had no additional seats at all. Then added some "Bench style" seats midway thru season 1. By season 2 incorporated bench and translucent benches. Season 3 adopted the miniature bench stools and remained so thru the series. But basically
