| Sg | Pl | |
| Nom | vöðvi | vöðvar (rule) |
| Acc | vöðva (rule) | vöðva (rule) |
| Dat | vöðva (rule) | vöðum (rule) |
| Gen | vöðva (rule) | vöðva (rule) |
| Sg | Pl | |
| Nom | vöðvinn (rule) | vöðvarnir (rule) |
| Acc | vöðvann (rule) | vöðvana (rule) |
| Dat | vöðvanum (rule) | vöðunum (rule) |
| Gen | vöðvans (rule) | vöðvanna (rule) |