1. Sensory systems in sharks
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2. 01
Vision
For the most part sharks have laterally positioned eyes. However, some of the more benthic species have more dorsally positioned eyes. When compared with mammals, sharks are considered to have generally small eyes compared to body size, although some species of Lamniforme shark have much larger eyes. In all sharks the two eyes oppose each other which allows for 360◦ visual field, especially in the case of a shark in motion utilising a laterally sinusoidal swimming pattern.
Cross section through a shark eye showing ocular and retinal anatomy. Tapetum lucidium shown in non-occluded state exposing reflective plates for greater visual sensitivity under scotopic conditions. (Heuter and Gilbert, 1990)

3. Eye of a Porbeagle Shark

4. Acoustico-lateralis System02
Acoustico-lateralis System
In sharks, hearing and vibration detection (The Acoustico-Lateralis System) are fundamentally linked. For sharks the inner ears are nestled inside the posterior part of the braincase on top of the head. The only external manifestation of a shark's ears are two small openings on top of the head, just behind the eyes, known as endolymphatic pores.
A shark's main vibration sensing mechanism is the lateral line, which is visible externally by a row of tiny pores along each flank. Anteriorly, this system of pores branches out over the shark's head in complex patterns nested between and around the electrosensory pores. Despite their apparent differences, the shark inner ear and lateral line system are based on the same basic mechanism.

5. Morphology of the lateral line canal system and superficial neuromasts in elasmobranchs.

6. 03
Electroreception
Diagram to illustrate the surface area of the head of a Squaloid shark which is covered with the electrosensory system with a magnified illustration of an individual ampullae, demonstrating how each cell is innervated by primary afferent neurons.

7. Chemoreception Olfaction(Smell) Gustation (Taste) 04
Olfaction in sharks is an important sense used in the detection and localization of prey. The sensory epithelium consists of microvillous sensory and ciliated support cells that form the superficial layer of the olfactory rosettes contained within large bilateral olfactory cavities on the ventral surface of the snout
Sharks are widely regarded as having little or no sense of taste.Although most people think of smell and taste as separate senses, they are actually different gradations of the same sensory experience.

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