A primary sensilla cell type and the intracellular organella. Transmission electron microscopy (TEM) images. A: Cross section of the single layer epidermis of the branchial crown. B: Enlarged view of the same cell to show the organella. Inset: a cross-section showing the microtubules of cilia outside of the cuticle. ax, axon; cu, cuticle; gry; yellow-color granule; mf, muscle fiber; mt, mitochondrion; nu, nucleus; sc, supporting cells; ve, vesicle. Scale bar in A, B: 5 μm; Inset, 200 nm.