spine apparatus
A specialization of the endomembrane system found in some classes of dendritic spines consisting of two or more closely apposed lamellae with interspersed electron dense material. The endomembrane component is continuous with the smooth endoplasmic reticulum.
GO:0043227
membrane-bounded organelle
is_a
GO:0012505
endomembrane system
part_of
GO:0043197
dendritic spine
part_of
dense material
narrow