diff --git a/code/datums/organs.dm b/code/datums/organs.dm
index 6bb5d6c7b93..a042c55664c 100644
--- a/code/datums/organs.dm
+++ b/code/datums/organs.dm
@@ -37,49 +37,49 @@
 	name = "l arm"
 	icon_name = "l_arm"
 	max_damage = 75
-	body_part = ARMS
+	body_part = ARM_LEFT
 
 /datum/organ/external/l_foot
 	name = "l foot"
 	icon_name = "l_foot"
 	max_damage = 40
-	body_part = FEET
+	body_part = FOOT_LEFT
 
 /datum/organ/external/l_hand
 	name = "l hand"
 	icon_name = "l_hand"
 	max_damage = 40
-	body_part = HANDS
+	body_part = HAND_LEFT
 
 /datum/organ/external/l_leg
 	name = "l leg"
 	icon_name = "l_leg"
 	max_damage = 75
-	body_part = LEGS
+	body_part = LEG_LEFT
 
 /datum/organ/external/r_arm
 	name = "r arm"
 	icon_name = "r_arm"
 	max_damage = 75
-	body_part = ARMS
+	body_part = ARM_RIGHT
 
 /datum/organ/external/r_foot
 	name = "r foot"
 	icon_name = "r_foot"
 	max_damage = 40
-	body_part = FEET
+	body_part = FOOT_RIGHT
 
 /datum/organ/external/r_hand
 	name = "r hand"
 	icon_name = "r_hand"
 	max_damage = 40
-	body_part = HANDS
+	body_part = HAND_RIGHT
 
 /datum/organ/external/r_leg
 	name = "r leg"
 	icon_name = "r_leg"
 	max_damage = 75
-	body_part = LEGS
+	body_part = LEG_RIGHT
 
 /datum/organ/internal
 	name = "internal"
diff --git a/code/setup.dm b/code/setup.dm
index 6d27fcd6c68..53d53343191 100644
--- a/code/setup.dm
+++ b/code/setup.dm
@@ -118,10 +118,18 @@
 #define HEAD			1
 #define UPPER_TORSO		2
 #define LOWER_TORSO		4
-#define LEGS			8
-#define FEET			16
-#define ARMS			32
-#define HANDS			64
+#define LEG_LEFT		8
+#define LEG_RIGHT		16
+#define LEGS			24
+#define FOOT_LEFT		32
+#define FOOT_RIGHT		64
+#define FEET			96
+#define ARM_LEFT		128
+#define ARM_RIGHT		256
+#define ARMS			384
+#define HAND_LEFT		512
+#define HAND_RIGHT		1024
+#define HANDS			1536
 
 //bitflags for mutations
 #define PORTALS 1