diff --git a/anatomy/migrations/0047_auto_20211022_2038.py b/anatomy/migrations/0047_auto_20211022_2038.py
new file mode 100644
index 00000000..f20a4a9a
--- /dev/null
+++ b/anatomy/migrations/0047_auto_20211022_2038.py
@@ -0,0 +1,28 @@
+# Generated by Django 3.2.8 on 2021-10-22 19:38
+
+import anatomy.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('anatomy', '0046_alter_exam_open_access'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='structure',
+            name='id',
+        ),
+        migrations.AlterField(
+            model_name='anatomyquestion',
+            name='image',
+            field=models.ImageField(help_text="The image to use for the question. Ideally use use unmarked images and annotate (arrow) them on the test system. If you wish to reuse an image that is already uploaded 'clone' the question that contains it.As a preference", upload_to=anatomy.models.image_directory_path),
+        ),
+        migrations.AlterField(
+            model_name='structure',
+            name='structure',
+            field=models.CharField(max_length=200, primary_key=True, serialize=False),
+        ),
+    ]
diff --git a/anatomy/models.py b/anatomy/models.py
index 2951ba2d..3a4bed13 100644
--- a/anatomy/models.py
+++ b/anatomy/models.py
@@ -43,7 +43,7 @@ class BodyPart(models.Model):
 
 
 class Structure(models.Model):
-    structure = models.CharField(max_length=200)
+    structure = models.CharField(max_length=200, primary_key=True)
 
     def __str__(self):
         return self.structure