A cable management apparatus includes a cable support, and a connecting member. The cable support includes a first support and a second support. A rail assembly includes an outer rail and an inner rail slidably attached to the outer rail. The first support is rotationally attached to the inner rail and the second support is rotationally attached to the outer rail. The connecting member connects the first and second supports and extends a blocking portion. The first support is capable of changing position relative to the second support while the inner rail and the outer rail stay relatively static. The blocking portion is supported by the supporting member and is capable of disengaging from the supporting member.