The Four Sons of Horus were traditionally the guardians of
the internal organs of the deceased. Each was associated with
a particular organ, and also with a different cardinal point
on the compass.
The Four Sons Of Horus
God
Protects
Head
Point
Goddess
Imsety
Liver
Human
South
Isis
Hapy
Lungs
Baboon
North
Nephthys
Duamutef
Stomach
Jackal
East
Neit
Qebehsenuef
Intestines
Falcon
West
Selkis
The Four Sons, from the British Museum
Coffin art detail showing the 4 canopic jars under the Lion Bier
while the deceased is attended by Anubis and Horus.