I am thinking: ECM = extracellular matrix, then we have intracellular mentioned and peri = pericellular, may be...

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Note added at 5 mins (2007-09-11 18:47:13 GMT)
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http://www.ncbi.nlm.nih.gov/sites/entrez?tmpl=NoSidebarfile&...

The term is: ** pericellular matrix **

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Note added at 6 mins (2007-09-11 18:48:25 GMT)
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Hyaluronan-dependent ** pericellular matrix. **

Evanko SP, Tammi MI, Tammi RH, Wight TN.
The Hope Heart Program, Benaroya Research Institute at Virginia Mason, 1201 9th Avenue, Seattle, WA 98101, USA.
Hyaluronan is a multifunctional glycosaminoglycan that forms the structural basis of the pericellular matrix. Hyaluronan is extruded directly through the plasma membrane by one of three hyaluronan synthases and anchored to the cell surface by the synthase or cell surface receptors such as CD44 or RHAMM. Aggregating proteoglycans and other hyaluronan-binding proteins, contribute to the material and biological properties of the matrix and regulate cell and tissue function. The ** pericellular matrix ** plays multiple complex roles in cell adhesion/de-adhesion, and cell shape changes associated with proliferation and locomotion.

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Note added at 8 mins (2007-09-11 18:50:54 GMT)
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http://jcs.biologists.org/cgi/content/abstract/99/2/227