the ecchordosis physaliphora , a small gelatinous mass attached to the midline of the clivus , is characterized ultrastructurally by glycogen-laden intracytoplasmic vacuoles , focally distended endoplasmic reticulum and perinuclear cisterns with cytoplasmic invaginations , large clusters of granular endoplasmic reticulum interdigitating with mitochondria , and an abundant extracellular space .
C0014239
endoplasmic reticulum
C0010834
cytoplasmic