The structure of the human semilunar plica at different stages of its development a morphological and morphometric study

Arends, Gunna; Schramm, Uda

doi:10.1016/s0940-9602(04)80002-5

Cited by 26 publications

(27 citation statements)

References 9 publications

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“…Although vestigial in humans (retained as the plica semilunaris; Tripathi and Tripathi, 1984;Arends and Schramm, 2004), the nictitating membrane is common throughout mammals (e.g., aardvark, platypus, many primates) as well as chondrichthyans, nonburrowing lizards, crocodilians, and birds (Walls, 1942;Underwood, 1970;Arao and Perkins, 1968). Movement of the nictitating membrane across the cornea is under muscular control and acts to mechanically protect, cleanse, and moisten the surface.…”

Section: Skeletal Elements Of the Ocular Adnexamentioning

confidence: 99%

“…Research on domesticated mammals suggest that these laminae may consist of purely hyaline cartilage (cats and horses) or may be heavily invested with elastic fibers (dogs, pigs, and cows; Schlegel et al, 2001). Although not expected (Arends and Schramm, 2004), cartilage development within the plica semilunaris of humans has been observed (Stibbe, 1928).…”

Section: Skeletal Elements Of the Ocular Adnexamentioning

confidence: 99%

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Skeletal elements in the vertebrate eye and adnexa: Morphological and developmental perspectives

Franz‐Odendaal

Vickaryous

2006

Developmental Dynamics

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Although poorly appreciated, the vertebrate eye and adnexa are relatively common sites for skeletogenesis. In many taxa, the skeleton contributes to internal reinforcement in addition to the external housing of the eye (e.g., the circumorbital bones and eyelids). Eyeball elements such as scleral cartilage and scleral ossicles are present within a broad diversity of vertebrates, albeit not therian mammals, and have been used as important models for the study of condensations and epithelial-mesenchymal interactions. In contrast, other elements invested within the eye or its close surroundings remain largely unexplored. The onset and mode of development of these skeletal elements are often variable (early versus late; involving chondrogenesis, osteogenesis, or both), and most (if not all) of these elements appear to share a common neural crest origin. This review discusses the development and distribution of the skeletal elements within and associated with the developing eye and comments on homology of the elements where these are questionable.

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Section: Skeletal Elements Of the Ocular Adnexamentioning

confidence: 99%

Section: Skeletal Elements Of the Ocular Adnexamentioning

confidence: 99%

Skeletal elements in the vertebrate eye and adnexa: Morphological and developmental perspectives

Franz‐Odendaal

Vickaryous

2006

Developmental Dynamics

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“…Lymphoplasmacytic elements, granulocytes, and macrophages could also be seen around the blood vessels and in the subepithelial area, indicating that plica semilunaris could be a part of the human ocular immune system. [4] Our patient is the second case to be reported, with persistent nictitating membrane in one eye with no associated systemic disorder.…”

Section: Discussionmentioning

confidence: 83%

Persistent unilateral nictitating membrane in a 9-year-old girl: A rare case report

Heralgi

Thallangady

Venkatachalam

et al. 2017

Indian J Ophthalmol

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We report a case of persisting nictitating membrane in a 9-year-old girl presenting to us with the complaints of fleshy mass in the medial part of the left eye since birth, which was nonprogressive. On examination, her left eye was amblyopic with a vision of 20/500. The membrane was continuous with the medial canthus and was spread in a horizontal fashion, covering the underlying bulbar conjunctiva and one-third of the cornea. The globe however moved freely underneath the membrane, indicating no attachment between the globe and overlying membrane. The patient underwent simple excision of the nictitating membrane with good outcome.

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“…In some mammals these are histochemically distinct, with the superficial gland being mucous and the deep gland producing lipid secretions. This led Sakai [42] to redefine the anterior orbital glands based solely upon type of secretion rather than location; however, that practice causes problems not only in species with mixed glands [42] but also in embryological studies [43, 44]. Thus, in this study, we used only the anatomical definitions [39] and distinguished the two groups of anterior superficial glands (SAOG and LAOG) from the deep (Harderian: DAOG) anterior glands in fetal rabbits.…”

Section: Discussionmentioning

confidence: 99%

“…One set of these, the SAOG, is absent by day 27. Only two other studies have detailed the fetal development of the SAOG: one showed the growth of a large SAOG in two species of deer [44] and the other revealed the loss of a small putative SAOG in humans [43]. Thus, the development of the SAOG in the rabbit resembles that observed in humans.…”

Section: Discussionmentioning

confidence: 99%

Development of the Lacrimal Apparatus in the Rabbit (Oryctolagus cuniculus) and Its Potential Role as an Animal Model for Humans

Rehorek

Holland

Johnson

et al. 2011

Anatomy Research International

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Rabbits have been proposed as a model organism for the human lacrimal apparatus (LA), including the nasolacrimal duct (NLD), based principally on comparative studies of adult morphology; however, little is known about its development. The NLD first appears as an incomplete primordium in the subcutaneous region of the primordial eyelid and subsequently elongates to reach the naris. One posterior and three anterior orbital glands are present fetally although one of the anterior glands is soon lost. The NLD follows a tortuous path and passes through a bony canal consisting of lacrimal, maxilla, and maxilloturbinal bones at different regions. Although early developmental similarities exist to haplorhine primates, the narial opening of the NLD resembles strepsirrhines. This distinction, along with the ductal and glandular differences at the orbital end of the NLD, indicates that rabbits may be a poor model for LA drainage in primates, specifically humans.

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The structure of the human semilunar plica at different stages of its development a morphological and morphometric study

Cited by 26 publications

References 9 publications

Skeletal elements in the vertebrate eye and adnexa: Morphological and developmental perspectives

Skeletal elements in the vertebrate eye and adnexa: Morphological and developmental perspectives

Persistent unilateral nictitating membrane in a 9-year-old girl: A rare case report

Development of the Lacrimal Apparatus in the Rabbit (Oryctolagus cuniculus) and Its Potential Role as an Animal Model for Humans

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