Fourth Division

The Fourth Division (四番隊, yonbantai), also known as Squad 4 in the English Dub, is one of the Gotei 13, headed by Captain Retsu Unohana.
The 4th Division is the medical/supply division. They are responsible for both treating the injured and doing most of the manual labor, such as cleaning the Seireitei. The 4th Division is further divided into teams that have specific assigned jobs. Other division members use their spiritual power only for fighting. Members of the 4th Division possess spiritual powers that is used to tend to wounds and provide relief. They use these special powers and the benefits of their daily training to act with precision and speed to aid injured comrades. 4th Division administers emergency first aid to injured division members and transports them to the General Emergency Relief Station.
In addition, the nurses who work in the Sōgō Kyūgo Tsumesho (綜合救護詰所, the coordinated relief station) have special Shihakushō (死覇装, Garment of Dead Souls) that are pink in colour with hats that are reminicent of nurse uniforms of the Human World.

They are looked down upon by the 11th Division who usually bully them around because they believe that the 4th Division are just a weak medical team, as opposed to the 11th Division, which is combat-focused, although most members of the 11th Division are afraid of the Captain Retsu Unohana.
Like all the other barracks, the 4th Division Barracks house the offices and living quarters of the Shinigami of the 4th. However, the 4th Division Barracks also houses the Sōgō Kyūgo Tsumesho (綜合救護詰所, the coordinated relief station), which is the primary medical facility of the Seireitei and Soul Society at large.

 Info from :  http://bleach.wikia.com/

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