How we see depends upon the transfer of light. Light passes through the front of the eye (cornea) to the lens. The cornea and the lens help to focus the light rays onto the back of the eye (retina). The cells in the retina absorb and convert the light to electrochemical impulses which are transferred along the optic nerve and then to the brain.
The Ear:
The external ear consist of two parts, the first being the pinna, the skin covered flabby cartilage of the ear. The function of the pinna is to protect the eardrum (tympanic membrane). The outer ear also functions to collect sound waves to the eardrum through the ear canal.
The second component of the external ear is the auditory ear canal or meatus. There are modified sweat glands that secrete ear wax in the ear canal.
The middle ear refers to the hollowed air-filled bony space (tympanic cavity) in the temporal bone of the skull behind the eardrum. It is just separated from the outer ear by the ear drum. There are three tiny bones (auditory ossicles) in the tympanic cavity that vibrates when exposed to sound waves, namely.
The inner ear is the most complicated component of the auditory system located into a tiny space of the hardest temporal bone. The inner ear is made of three related structures - the cochlea (spiral tube), three semicircular canals and the vestibule (labyrinth).
The Eye:
How we see depends upon the transfer of light. Light passes through the front of the eye (cornea) to the lens. The cornea and the lens help to focus the light rays onto the back of the eye (retina). The cells in the retina absorb and convert the light to electrochemical impulses which are transferred along the optic nerve and then to the brain.The Ear:
The external ear consist of two parts, the first being the pinna, the skin covered flabby cartilage of the ear. The function of the pinna is to protect the eardrum (tympanic membrane). The outer ear also functions to collect sound waves to the eardrum through the ear canal.The second component of the external ear is the auditory ear canal or meatus. There are modified sweat glands that secrete ear wax in the ear canal.
The middle ear refers to the hollowed air-filled bony space (tympanic cavity) in the temporal bone of the skull behind the eardrum. It is just separated from the outer ear by the ear drum. There are three tiny bones (auditory ossicles) in the tympanic cavity that vibrates when exposed to sound waves, namely.
The inner ear is the most complicated component of the auditory system located into a tiny space of the hardest temporal bone. The inner ear is made of three related structures - the cochlea (spiral tube), three semicircular canals and the vestibule (labyrinth).