type IV spiral ligament fibrocyte 2011-07-11T03:40:46Z type 4 otic fibrocyte A spiral ligament fibrocyte that is located in the triangular space inferior to the crista basilaris (basilar crest). This cell is spindle-shaped and expresses NKCC1 but minimal to no Na,K-ATPase (ATP1A1, ATP1B1) in mice and humans, and lacks connexin 26/30 in mice, indicating it does not participate in K⁺ recycling, unlike type II fibrocytes. Type IV fibrocyte is uniquely characterised by strong expression of connective tissue growth factor (CTGF) in mice, suggesting roles in tissue remodelling and paracrine signalling to other cochlear cells. type IV SLF type 4 spiral ligament fibrocyte spiral ligament fibrocyte