eyebrows- prevent sweat from dripping into eye
eyelids- The eyelids serve to protect the eye from foreign matter, such as dust, dirt, and other debris, as well as bright light that might damage the eye. When you blink, the eyelids also help spread tears over the surface of your eye, keeping the eye moist and comfortable.
conjunctiva- The conjunctiva is the thin, transparent tissue that covers the outer surface of the eye. It begins at the outer edge of the cornea, covering the visible part of the sclera, and lining the inside of the eyelids. It is nourished by tiny blood vessels that are nearly invisible to the naked eye. helps lubricate the eye by producing mucus and tears
lacrimal apparatus- The lacrimal apparatus works to produce tears that are needed to wet the front of the eye and flush debris from the ocular surface.
extrinsic eye muscles-The extraocular or extrinsic eye muscles, considering their relatively small size, are incredibly strong and efficient. There are the six extraocular muscles, which act to turn or rotate an eye about its vertical, horizontal, and antero-posterior axes: medial rectus (MR), lateral rectus (LR),
The ear is made up of three parts: the outer, middle, and inner ear. All three parts of the ear are important for detecting sound by working together to move sound from the outer part through the middle and into the inner part of the ear. Ears also help to maintain balance. First, the air vibrations are converted to vibrations of the tympanic membrane and
ossicles of the middle ear. These, in turn, become vibrations in the fluid within the cochlea. Finally, the
fluid vibrations set up traveling waves along the basilar membrane that stimulate the hair cells of the
organ of Corti. These cells convert the sound vibrations to nerve impulses in the fibres of the cochlear
nerve, which transmits them to the brain stem, from which they are relayed, after extensive processing, to
the primary auditory area of the cerebral cortex, the ultimate centre of the brain for hearing