Morphometry and anatomical variations of the inferior oblique muscle as relevant to the strabismus surgeries

Gupta, Tulika; Kharodi, Chetan; Cheema, Neelkamal

doi:10.1080/09273972.2023.2168706

Strabismus

2023

DOI: 10.1080/09273972.2023.2168706

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Morphometry and anatomical variations of the inferior oblique muscle as relevant to the strabismus surgeries

Tulika Gupta

Chetan Kharodi

Neelkamal Cheema

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2023

2024

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Cited by 2 publications

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Evaluation of the Effect of Inferior Oblique Myectomy on Corneal and Anterior Segment Parameters

YILMAZ,

TOPTAN,

ÇAKICI

et al. 2023

Sakarya Medical Journal

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Purpose: This study aimed to evaluate the effect of inferior oblique myectomy (IOM) surgery on the cornea and anterior segment. Methods: The sheimpflug corneal topographies of 56 eyes of 33 patients who underwent IOM were analyzed at preoperative, postoperative 1 week, 1 month, 3 months, and 6 months. Astigmatism degree (Cyl), astigmatism axis (Ax), K1, central corneal thickness (CCT), anterior chamber depth (ACD), anterior chamber volume (ACV), iridocorneal angle (ICA), and horizontal visible iris diameter (HVID) were evaluated. Results: The mean corneal Cyl, K1, ICA, ACD, and HVID did not change after IOM (p=0.671, p=0.377, p=0.431, p=0.588, p=0.795, respectively). There was a statistically significant change in Ax (p=0.025). The right Ax decreased, and the left Ax increased the most at 1 month (p=0.025, p=0.882, respectively). Ax increase was also detected in the left eye that was not operated on. The mean CCT increased and mean ACV decreased at 1 month (p=0.588, p=0.270, respectively), but these changes returned to preoperative values at 3 months. Conclusion: The manifestation of anterior segment alterations and intorsion in both eyes following inferior oblique myectomy may contribute to diminished visual acuity and the potential onset of amblyopia. These alterations merit consideration during the assessment, and if deemed necessary, the provision of new spectacles should be considered as a preventive measure against anisometropic amblyopia.

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Evaluation of the Effect of Inferior Oblique Myectomy on Corneal and Anterior Segment Parameters

YILMAZ,

TOPTAN,

ÇAKICI

et al. 2023

Sakarya Medical Journal

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Anatomical Study of the Inferior Oblique Muscle and Its Innervation: Morphometric Characteristics, Anatomical Variations, and Histological Evaluation of the Nerve to the Inferior Oblique Muscle

Haładaj,

Tubbs,

Varga

2024

Brain Sciences

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Background: This report aims to supplement the existing knowledge on the inferior oblique muscle. In particular, this study presents detailed anatomical and histological data concerning the muscle’s entry point (or entry zone) of the nerve to the inferior oblique muscle. Particular attention was paid to the topographical relationships of the nerve to the inferior oblique muscle (NTIO), including the location of its entry point to the muscle’s belly and its anatomical variations. Methods: Sixty orbits from cadaveric hemi-heads fixed in 10% formalin were studied. The course of the NTIO was traced along the lateral border of the inferior rectus muscle as far as its entry point to the inferior oblique muscle. Particular attention was paid to the various ways in which the NTIO’s muscular sub-branches penetrated between the fibers of the inferior oblique muscle. Results: Three types of NTIO entries to the inferior oblique muscle’s belly were distinguished. In the most common type (48.3%), the nerve entered the muscle’s inferior (orbital) surface. In the next most common type (36.7%), terminal muscular sub-branches of the NTIO joined the superior (also referred to as ocular or global) surface of the inferior oblique muscle. In the remaining four cases (15%), the terminal sub-branches of the NTIO were divided into two main groups (superior and inferior) that joined both the superior and inferior surfaces of the muscle. Histological examination confirmed that the distal part of the NTIO shows a characteristic arcuate course (angulation) just before reaching the muscle’s belly. The process for splitting and forming separate muscular sub-branches of the NTIO was observed for all the examined histological specimens at the level of the nerve’s angulation. Conclusions: The presented findings enhance the understanding of the anatomical variations and precise distribution of motor sub-branches reaching the inferior oblique muscle, which may deepen anatomical knowledge and potentially enhance the management of ocular motor disorders.

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Morphometry and anatomical variations of the inferior oblique muscle as relevant to the strabismus surgeries

Cited by 2 publications

References 15 publications

Evaluation of the Effect of Inferior Oblique Myectomy on Corneal and Anterior Segment Parameters

Evaluation of the Effect of Inferior Oblique Myectomy on Corneal and Anterior Segment Parameters

Anatomical Study of the Inferior Oblique Muscle and Its Innervation: Morphometric Characteristics, Anatomical Variations, and Histological Evaluation of the Nerve to the Inferior Oblique Muscle

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