A cable management structure (2000/2300/2600) comprising: a base portion for removable mounting on a telecommunications fixture, the base portion defining an upper guide portion (2014/2314) and a lower guide portion (2016/2316/2616) separated by a cable channel (2018/2318/2618), wherein a transverse slit (2024/2324/2624) defined between the upper and lower guide portions (2014, 2016/2314, 2316/2616) communicates with the cable channel (2018/2318/2618) for insertion of cables into the channel (2018/2318/2618), wherein at least one of the upper and lower guide portions (2014, 2016/2314, 2316/2616) defines a curved surface for bend radius protection for optical fibers of the cabling; and cabling, the structure characterized in that it comprises a flexible portion (2012/2317/2616) that defines a fixation portion that is fixed with respect to the base portion, the flexible portion also defining an elongate portion (2028/2316/2616) that extends along the upper and lower guide portions (2014, 2016/2314, 2316/2616) that is elastically flexible relative to the upper and lower guide portions (2014, 2016/2314, 2316/2616) of the base and is biased to cover at least a portion of the slit (2024/2324/2624) for retaining cables within the channel (2018/2318/2618), wherein the elongate portion (2028/2316/2616) of the flexible portion (2012/2317/2616) defines a finger tab (2032/2317/2632) at an end thereof for manual flexing of the flexible portion (2012/2317/2616) for insertion and/or removal of cables, the finger tab (2032/2317/2632) protruding laterally from the base portion so as to be positioned farther out than side faces defined by both the upper and lower guide portions (2014, 2016/2314, 2316/2616), wherein the finger tab (2032/2317/2632) defines a tapered surface (2036/2038/2338/2636) such that when contacted by cabling along a first direction, the interaction of the cabling with the tapered surface (2036/2038/2338/2636) forces movement of the elongate portion (2028/2316/2616) of the flexible portion (2012/2317/2616) under a bias in a second direction that is different than the first direction, wherein the first direction is a lateral direction and the second direction is along an upward-to-downward direction. a base portion for removable mounting on a telecommunications fixture, the base portion defining an upper guide portion (2014/2314) and a lower guide portion (2016/2316/2616) separated by a cable channel (2018/2318/2618), wherein a transverse slit (2024/2324/2624) defined between the upper and lower guide portions (2014, 2016/2314, 2316/2616) communicates with the cable channel (2018/2318/2618) for insertion of cables into the channel (2018/2318/2618), wherein at least one of the upper and lower guide portions (2014, 2016/2314, 2316/2616) defines a curved surface for bend radius protection for optical fibers of the cabling; and cabling, the structure characterized in that it comprises a flexible portion (2012/2317/2616) that defines a fixation portion that is fixed with respect to the base portion, the flexible portion also defining an elongate portion (2028/2316/2616) that extends along the upper and lower guide portions (2014, 2016/2314, 2316/2616) that is elastically flexible relative to the upper and lower guide portions (2014, 2016/2314, 2316/2616) of the base and is biased to cover at least a portion of the slit (2024/2324/2624) for retaining cables within the channel (2018/2318/2618), wherein the elongate portion (2028/2316/2616) of the flexible portion (2012/2317/2616) defines a finger tab (2032/2317/2632) at an end thereof for manual flexing of the flexible portion (2012/2317/2616) for insertion and/or removal of cables, the finger tab (2032/2317/2632) protruding laterally from the base portion so as to be positioned farther out than side faces defined by both the upper and lower guide portions (2014, 2016/2314, 2316/2616), wherein the finger tab (2032/2317/2632) defines a tapered surface (2036/2038/2338/2636) such that when contacted by cabling along a first direction, the interaction of the cabling with the tapered surface (2036/2038/2338/2636) forces movement of the elongate portion (2028/2316/2616) of the flexible portion (2012/2317/2616) under a bias in a second direction that is different than the first direction, wherein the first direction is a lateral direction and the second direction is along an upward-to-downward direction.