The Fouh compament of extensor retinaculum has all the following structures except
Extensor retinaculum : First compament - Abductor pollicis longus Extensor pollicis brevis Second compament - Extensor carpi radialis longus Extensor carpi radialis brevis Third Compament - Extensor pollicis longus Fouh Compament - Extensor digitorum Extensor indicis Posterior interosseous nerve Anterior interosseous aery Fifth compament - Extensor digiti minimi Sixth compament - Extensor carpi ulnaris Ref: BD Chaurasia Human Anatomy 5e vol 2 pg 126.
Anterior interosseous aery
Posterior interosseous nerve
Extensor indices
Extensor pollicis longus
Upper limb