Head

The head was where the brain was located.

The Ninth Doctor used the head of the Auton duplicate of Mickey Smith to trace the signal of the Nestene Consciousness. (TV: Rose)

Before the Ninth Doctor regenerated, he speculated his next incarnation could have two heads or none at all. (TV: The Parting of the Ways)

Among the artefacts in the Vault were the heads of a CyberNomad, an Earth Reptile and a scarecrow. (TV: Dalek)

Historians who had been allowed access to the "Monster Vaults" of the databanks in the Doctor's TARDIS observed that every part of an Abzorbaloff's body "from head to toe" was in a constant state of suction, thus consuming any living thing upon contact. The heads of the Abzorbaloffs' absorbed victims remained alive and conscious within its digestive tract and only when it had completely drained their brains were the heads fully assimilated into its "fleshy corpulence". (PROSE: The Monster Vault)

On Skaro, the Terrorkons had two heads. (COMIC: Terrorkon Harvest) According to Susan, two headed alien species were a rare sight. (AUDIO: Hunters of Earth)

The Aplans were humanoid lifeforms with two heads. The heads apparently had their own separate intelligences and personalities. (TV: The Time of Angels)

Amy Pond was afraid that travelling in the TARDIS while pregnant would have some sort of effect on the baby, suggesting it could have three heads "or, like, a timehead or something." (TV: Day of the Moon)

The natural design of the 456 consisted of three "heads", connected to one body via three long necks, possibly a conjoined triplet species. It resembled a large, plucked, three-headed swan. (TV: Children of Earth: Day Four)

Corpse Gipe resembled a vulture with three heads. (PROSE: Time Lapse)

The natives of the planet Thursday shrunk the heads of their enemies and displayed them as a warning. (COMIC: The Trick)

The people of Harmony kept the living disembodied heads of visitors who were scientifically minded in glass cases to make use of their intelligence. The Second Doctor discovered the room in which the heads were kept during his visit to Harmony. (PROSE: Planet of Bones)

The Eleventh Doctor and Amy Pond once saw that what appeared to be the Robot King was beheaded, only to find that it was the real King. Fortunately, the Doctor was able to re-attach the head, as he recounted to Rory Williams. (TV: The Doctor's Wife)

Dorium Maldovar had a Wi-Fi-based media chip implanted in his head, which he used to keep himself entertained after he was beheaded by the Headless Monks. (TV: The Wedding of River Song)