Morphological and Morphometrical Studies of Eyeball and Retina in Goats
2021
Rajathi, S.
Retina is the innermost light sensitive layer of eye. The retina consists of three layers of neuronal cells namely photoreceptor cells (rods and cones), bipolar cells and ganglion cells. Six heads each from apparently healthy young and adult goat were collected. The axial length of the globe, distance between anterior and posterior poles of the globe were measured by using thread and scale. The shape of the eye ball was almost spherical. The shape of the pupil was oval in horizontal plane. The antero-posterior axis of the eye ball was greater than the other axis but the nasotemporal axis of the eye ball was slightly larger than the dorsoventral axis. Optic nerve was located ventral and lateral to the posterior pole. The retina was an off-white coloured delicate membrane which extended from the entrance of the optic nerve to the ciliary body, and it terminated at a circular line, the ora ciliaris retinae. Tapetum in both young and adult goat was located dorsal to the optic disc mostly on the dorsal side and it was horizontal triangular in shape. It occupied the dorsal half of the retinal fundus and contained optic disc in its ventral part. Tapetum in goat was iridescent blue in colour in fresh but changed to metallic blue in colour on fixation. The optic disc in young and adult goat it was located at the junction of tapetum and nontapetum. The optic nerve head was white in colour. The shape of the optic nerve head was round in goat in both young and adult animals. The mean weight of the eyeball, axial length, nasotemporal and dorsoventral diameter of the eye balls among young and adult goat did not show significant difference at 5% level of significance.
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