fig1
Figure 1. A perpendicular section of the nostril sill. Two arrowheads indicate the span of the nostril sill. A: Gross specimen; B: Histology with Masson trichrome stain, bar indicates 1.5 mm. Note the thick dermis and the obliquely running depressor septi nasi muscle (D) comprising the nostril sill. O: orbicularis oris muscle; P: periosteum; G: nasal glands
