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Some observations on the presence of annulate lamellae in alligator and sea gull adrenal cortical cells

1966; Academic Press; Volume: 14; Issue: 1-2 Linguagem: Inglês

10.1016/s0022-5320(66)80042-4

1878-2345

G. A. Harrison,

Nuclear Structure and Function

Adrenal cortical tissue was excised from Larus argentatus (sea gull) and Alligator mississippiensis, fixed in phosphate-buffered OsO4, and examined in the electron microscope. Annulate lamellae appeared in the cells from both types of animals. In the alligator, the annulate lamellae appeared to arise through a coalescence of vesicles derived from the nuclear membrane. On the other hand, lamellae in the sea gull cortical cells appeared to originate as sheets either delaminated from or formed on the nuclear membrane. The identical appearance of the two membranes, annulate lamellae and nuclear membrane, is demonstrated. The possibility that the annulate lamellae may arise in different ways depending on the cell type involved is discussed. In the sea gull, it has been suggested that the annulate lamellae may act to supplement the Golgi apparatus because of the similarity in membrane arrangement and the mode of vesicle formation in these two membrane systems.