"intraosseous part (12 mm): enters the lacrimal groove and descends within the nasolacrimal canal of the maxilla"
"membranous part (5 mm): runs in the nasal mucosa; terminates below the inferior nasal meatus as a slit-like opening where it is covered by a mucosal fold called the valve of Hasner (or plica lacrimalis)"
"Up to eight 'valves' of the nasolacrimal duct have been defined in the literature and are commonly seen in older anatomical texts and monographs. However, it has been contended that some of these are not true mucosal valves but just embryological irregularities in the ductal wall. From craniad to caudad, these 'valves' have been named: Foltz, Bochdalek, Rosenmüller, Huschke, Aubaret, Krause (or Béraud), Taillefer, Hasner (or Cruveilhier/Bianchi) 3,4"
Expected headings
"Valves"
"The nasolacrimal duct is the inferior continuation of the lacrimal sac and is ~17 mm in length in total. The duct runs in the bony nasolacrimal canal. There are two parts to the nasolacrimal duct:"
"membranous part (5 mm): runs in the nasal mucosa; terminates below the inferior nasal meatus as a slit-like opening where it is covered by a mucosal fold called the valve of Hasner (or plica lacrimalis)"
"Up to eight 'valves' of the nasolacrimal duct have been defined in the literature and are commonly seen in older anatomical texts and monographs. However, it has been contended that some of these are not true mucosal valves but just embryological irregularities in the ductal wall. From craniad to caudad, these 'valves' have been named: Foltz, Bochdalek, Rosenmüller, Huschke, Aubaret, Krause (or Béraud), Taillefer, Hasner (or Cruveilhier/Bianchi) 3,4"