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Specialized areas of close apposition (nexuses) are found between the smooth muscle cells of various organs (Dewey and Barr, 1962, 1964), including blood vessels (Cliff, 1967 ; Verity and Bevan, 1968; Devine and Simpson, 1968) . The nexus may appear as either a tight junction, with apparent membrane fusion, or a gap junction, possibly depending on the method of fixation (Brightman and Reese, 1969 ; and compare Cobb and Bennett, 1969 a with Uehara and Burnstock, 1970). These structures may be important in the conduction of electrical events which is known to occur between smooth muscle cells of various organs (Bozler, 1938 ; Tomita, 1967 ; Barr et al ., 1968; Abe and Tomita, 1968) . In addition, conduction between arterial smooth muscle cells is suggested by the successful use of the sucrose-gap method to record from this tissue (Keatinge and Richardson, 1963 ; Keatinge, 1964) . In the present work, intercellular junctions in arterial smooth muscle have been examined . Junctions between areas of the surface membrane from the same cell are also described and some implications of this finding are discussed .

NEXUSES BETWEEN AREAS OF THE SURFACE MEMBRANE OF THE SAME ARTERIAL SMOOTH MUSCLE CELL