Relative sizes of some cellular ultrastructural elements
1000 nanometers (nm) = 1 micrometer (µm)
1000 micrometers (µm) = 1 millimeter (mm)
| Structure | Thickness, distance, or diameter (nm) |
|---|---|
| Structure cleft in gap junction | Thickness, distance,or diameter (nm) 2 |
| Structure microfilaments (actin) | Thickness, distance,or diameter (nm) 5 - 7 |
| Structure plasma membrane | Thickness, distance,or diameter (nm) 7 - 8 |
| Structure intermediar filaments (neurofilaments, gliofilaments) | Thickness, distance,or diameter (nm) 8 - 12 |
| Structure myosin | Thickness, distance,or diameter (nm) 12 - 15 |
| Structure ribosomes | Thickness, distance,or diameter (nm) 15 - 25 |
| Structure intercellular clefts in neuropil | Thickness, distance,or diameter (nm) about 20 |
| Structure microtubules | Thickness, distance,or diameter (nm) 20 - 25 |
| Structure glycogen granules | Thickness, distance,or diameter (nm) 30 |
| Structure synaptic vesicles | Thickness, distance,or diameter (nm) 40 - 60 |
| Structure periodicity in collagen | Thickness, distance,or diameter (nm) 50 - 60 |
| Structure dense-core vesicles | Thickness, distance,or diameter (nm) 60 - 120 |
| Structure nuclear pores | Thickness, distance,or diameter (nm) 90 |
| Structure primary lysosomes | Thickness, distance,or diameter (nm) 100 - 200 |
| Structure centriole | Thickness, distance,or diameter (nm) 100 - 250 |
| Structure neurosecretory granules | Thickness, distance,or diameter (nm) 100 - 400 |
| Structure mitochondria | Thickness, distance,or diameter (nm) 100 - 500 |
| Structure cilia | Thickness, distance,or diameter (nm) 200 - 400 |
| Structure human hair | Thickness, distance,or diameter (nm) 70,000 |