capsule

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Several mechanisms have been suggested, including truncated optic edges, high index of refraction of the intraocular lens (IOL),transparency of the peripheral nasal capsule, and many others.
The sensory capsules--that is, the elements of neural crest tissue that surround the sense organs--are arrayed from anterior to posterior along the tripartite brain in this order: nasal capsule, optic capsule, and otic capsule.
The ethmoid region across the nasal capsules was relatively narrow, as in shortfin makos and porbeagles; white sharks, in contrast, have notably broad nasal capsules (Haswell, 1885; Parker, 1887; Compagno, 1990).