A more general sense, that responds to many different types of physical contact.
Sight and hearing
are special senses with distinct receptor cells designed to detect a very particular type of stimulus.
Taste and Smelling
chemical detectors that simply use different methods to detect the chemicals.
The transparent external surface of the eye.
Where light enters eye.
Muscle that regulates the amount of light that enters the eye by opening or closing the pupil.
transparent structure that focuses light rays on the back of the eye.
Layer at the back of the eye where photoreceptors.
Area of the retina that is particularly dense with photoreceptors.
photoreceptors that detect dim light, black and white, movement.
photoreceptors that detect red, blue, & green.
photoreceptors (rhodopsin, opsin & retinal) that change shape as light is absorbed.
The externally visible cartilaginous structure of the external ear. The outer ear directs sound waves into the ear canal., visible part of the outer ear. It collects sound and directs it into the auditory canal
the membrane in the ear that vibrates in response to the sound waves like the head of the drum. The eardrum. A structure that separates the outer ear from the middle ear and vibrates in response to sound waves.
The three small bones found in the middle ear (the malleus, the incus, and the stapes) that help to amplify the vibrations from sound waves. The malleus is atached to the tympanic membrane and the stapes is attached to the oval window of the cochlea.
the snail-shaped tube (in the inner ear coiled around the modiolus) where sound vibrations are converted into nerve impulses by the Organ of Corti; change the sound waves into electrical signals the brain can interpret.
Organ of Corti
the hearing organ of the inner ear, organ located in the cochlea; contains receptors (hair cells) that receive vibrations and generate nerve impulses for hearing
Taste buds are found inside papillae, there are two kinds:
Fungiform papillae: scattered over the entire tongue (most abundant at the tip and sides)
Circumvallate (or vallate) papillae: 7-12 form an inverted V a the back of the tongue.
most numerous type; found scattered over the surface of the tongue, but most at the tip & along sides.
found at back of tongue. Contain taste buds, and are responsible for sweet taste, Large, obvious protuberances always containing taste buds and distinguished easily because they form a "v" near the back of the tongue.
the nerve that carries smell impulses from the nose to the brain.
involved in the perception of taste stimuli, (5 sensory areas) frontal lobe; taste buds