Morphogenesis of the human excretory lacrimal system

Cuadra-Blanco, Crótida de la; Peces-Peña, M D; Jáñez-Escalada, L; Mérida‐Velasco, José Ramón

doi:10.1111/j.1469-7580.2006.00606.x

Cited by 55 publications

(49 citation statements)

References 14 publications

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“…[17][18][19] From this it can be presumed that the development of the canine tooth influences the already existing nasolacrimal duct and its course. Consequently, the NDS takes a V-shaped course in cats with higher degrees of brachycephalia.…”

Section: Discussionmentioning

confidence: 99%

Brachycephalic Feline Noses: CT and Anatomical Study of the Relationship between Head Conformation and the Nasolacrimal Drainage System

Schlueter

Budras

Ludewig

et al. 2009

Journal of Feline Medicine and Surgery

126

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Aims A study was designed to evaluate the influence of head conformation on the course of the nasolacrimal drainage system (NDS) in 31 brachycephalic and 15 mesocephalic cats using computed tomography (CT), CT-dacryocystography and anatomical methods. Findings The higher the degree of brachycephalia, the more the facial bones and upper canine teeth are displaced dorsally (ie, the more pronounced the dorsorotation). Dorsorotation leads to abnormal dislocation of the ventral nasal concha and to almost horizontally rotated upper canine teeth, and thus a steeply oriented NDS. In severe brachycephalia the NDS is forced to pass below the canine tooth (adopt a V-shaped course) and the drainage function seems to be inefficient. Practical relevance The rotation of the upper canine teeth appears to provide a basis for classification of brachycephalia in cats. The authors recommend that breeders avoid breeding from individuals affected by this condition and to give preference to cats with longer facial bones.

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Section: Discussionmentioning

confidence: 99%

Brachycephalic Feline Noses: CT and Anatomical Study of the Relationship between Head Conformation and the Nasolacrimal Drainage System

Schlueter

Budras

Ludewig

et al. 2009

Journal of Feline Medicine and Surgery

126

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“…At Carnegie stage 18, the lacrimal lamina bifurcates at extreme medial end to form the primordium of the lacrimal canaliculi ( Fig. 12.1 ) [ 6 ]. At Carnegie stage 19, the lacrimal lamina separates from the surface ectoderm to form the lacrimal cord, the medial end of which bifurcates to form two canaliculi.…”

Section: Embryologymentioning

confidence: 98%

“…There are 23 Carnegie stages which covers the 8-week postovulatory stage of the human embryo [ 6 ]. Each stage characterizes the morphological development of the embryo.…”

Section: Embryologymentioning

confidence: 99%

Congenital Nasolacrimal Duct Obstruction

Kamal

Ali

Gauba

et al. 2014

Principles and Practice of Lacrimal Surgery

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“…Close to the conjunctiva of eye, the nasolacrimal duct initially appears as the lacrimal cord of ectoderm-derived epithelial cells, extends from the orbital end and reaches the inferior nasal meatus by 10 weeks 3,4) . At the nasal end, the epithelium of NLD attaches tightly to the nasal mucosal membrane of endodermal-origin and they together provides a thick "Hasner's membrane" 5,6) or "Valve of Hasner" 7,8) .…”

Section: Introductionmentioning

confidence: 99%

Nasolacrimal duct opening to the inferior nasal meatus in human fetuses

Honkura

Takanashi

Hirano-Kawamoto

et al. 2017

Okajimas Folia Anat. Jpn.

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Summary: The purpose of this study is to describe the Hasner's membrane which is the main factor of congenital nasolacrimal duct obstruction. Hasner's membrane at the nasal end of the fetal nasolacrimal duct (NLD) is considered to rupture at and after birth. However, topographical anatomy around the membrane as well as a mechanism of rupture seems to be still obscure. We observed frontal or sagittal sections of 20 late-stage fetuses (28-33 weeks) and found the on-going rupture in 2 specimens. The present sections demonstrated that 1) the nasal dilation was not a simple ball-like structure but extended posteriorly and laterally; 2) dilation of the NLD consistently involved the lacrimal sac; 3) Hasner's membrane and ductal mucosal layer contained no macrophages and no or few arteries and nerves. The posterior extension of the NLD end ranged from 1-2 mm, while the lateral extension 3-5 mm although a site of the thinnest membrane varied in location between specimens. Moreover, the thickest NLD due to dilation was in the slightly orbital or upper side of the nasal end. Therefore, before surgical treatment of Hasner's membrane, evaluation using medical images seems to be necessary. Since the nasal epithelium on Hasner's membrane was most likely to destroy earlier than the NLD mucosal lining, observations of the membrane from the nasal cavity seemed helpful for diagnosis at which site would be broken and when.

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Morphogenesis of the human excretory lacrimal system

Cited by 55 publications

References 14 publications

Brachycephalic Feline Noses: CT and Anatomical Study of the Relationship between Head Conformation and the Nasolacrimal Drainage System

Brachycephalic Feline Noses: CT and Anatomical Study of the Relationship between Head Conformation and the Nasolacrimal Drainage System

Congenital Nasolacrimal Duct Obstruction

Nasolacrimal duct opening to the inferior nasal meatus in human fetuses

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