/itʃ/

Cases

SingularPluralWhen to use it
nominativethe insideiçlethe insidesthe plain dictionary form — the doer of the sentence
genitiveiçnithe inside'siçlenithe insides'the owner — whose it is
accusativeiçnithe inside (as the object)içlenithe insides (as the object)a specific, known object — whom or what
dativeiçgeto the insideiçlegeto the insidesdirection or recipient — to where, to whom
locativeiçdeat / in the insideiçledeat / in the insideswhere it is; also having — mende bar, "I have it"
ablativeiçdenfrom the insideiçledenfrom the insideswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
myiçimmy insideiçlerimmy insides
youriçingyour insideiçleringyour insides
his / heriçihis / her insideiçlerihis / her insides
ouriçibizour insideiçleribizour insides
you all'siçigizyou all's insideiçlerigizyou all's insides
theiriçleritheir insideiçleritheir insides

The overlap in the last rows is real, not a mistake: içleri can mean "his / her insides", "their inside", or "their insides" — context decides.