The functional anatomy of the ciliary muscle in four avian species

Brain, Behavior and Evolution
M T Pardue, Jacob G Sivak

Abstract

The functional anatomy of avian ciliary muscles has been difficult to describe, due to the muscle's inaccessible location inside the eye. The ciliary muscle of the chicken (Gallus gallus domesticus), the pigeon (Columbia livia), the kestrel (Falco sparverius) and the hooded merganser (Margus cucullatus) (four species with differing accommodative needs) was examined histologically in both the relaxed and contracted states. The ciliary muscle of all four species can be divided into three main muscle fibre groups based on insertion and origin: anterior, posterior and internal. The anterior muscle fibre group originates at the sclera under the scleral ossicles and inserts into the inner lamellae of the cornea. During accommodation these fibres pull the cornea posteriorly, changing the curvature of the cornea. The posterior muscle fibre group originates on the sclera and inserts posteriorly onto the baseplate of the ciliary body. The posterior fibre group acts on the baseplate of the ciliary body, pulling it forward to change the curvature of the lens during accommodation. The internal muscle fibre group extends from the baseplate of the ciliary body to the inner lamellae of the cornea and thus has a role in both corneal and lenticu...Continue Reading

Citations

Oct 13, 2001·Journal of Neuroscience Research·M ScarlatoD Pleasure
Jan 10, 2002·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Jane F KoretzPaul L Kaufman
Jul 20, 2002·Vision Research·Carmen Barrio-AsensioJorge Murillo-González
Feb 18, 2017·Archivos de la Sociedad Española de Oftalmología·J González-Martín-MoroA Clement-Corral
Jan 28, 2003·The Journal of Experimental Biology·Gadi Katzir, Howard C Howland
Feb 26, 2020··Jane F. Koretz, Jane F. Koretz

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