Human eye | Definition, Anatomy, Diagram, Function, & Facts
Oct 29, 2024 · Human eye, specialized sense organ in humans that is capable of receiving visual images, which are relayed to the brain. The anatomy of the eye includes auxiliary structures, such as the bony eye socket and extraocular muscles, as well as the structures of the eye itself, such as the lens and the retina.
Structure of the human eye and its disorders | Britannica
The human eye is roughly spherical. Light passes through its transparent front and stimulates receptor cells on the retina (cones for colour vision, rods for black-and-white vision in faint light), which in turn send impulses through the optic nerve to the brain.
Anatomy | Definition, History, & Biology | Britannica
Oct 28, 2024 · anatomy, a field in the biological sciences concerned with the identification and description of the body structures of living things. Gross anatomy involves the study of major body structures by dissection and observation and in its narrowest sense is …
Anatomy & Physiology Portal | Britannica
Human eye, in humans, specialized sense organ capable of receiving visual images, which are then carried to the brain. The eye is protected from mechanical injury by being enclosed in a socket, or orbit,...
Human body | Organs, Systems, Structure, Diagram, & Facts
1 day ago · Human anatomy and physiology are treated in many different articles. For detailed discussions of specific tissues, organs, and systems, see human blood ; cardiovascular system ; human digestive system ; human endocrine system ; renal system ; skin ; human muscle system ; nervous system ; human reproductive system ; human respiration ; human ...
Cornea | Structure, Function & Disease | Britannica
Nov 11, 2024 · cornea, dome-shaped transparent membrane about 12 mm (0.5 inch) in diameter that covers the front part of the eye. Except at its margins, the cornea contains no blood vessels, but it does contain many nerves and is very sensitive to pain or touch.
Eyelid | Eyelash, Eyebrow, Eyelid Function | Britannica
eyelid, movable tissue, consisting primarily of skin and muscle, that shields and protects the eyeball from mechanical injury and helps to provide the moist chamber essential for the normal functioning of the conjunctiva and cornea.The conjunctiva is the mucous membrane that lines the eyelid and covers the visible portion of the eyeball except the cornea (the transparent part of …
Iris | Eye, Structure, Anatomy, & Function | Britannica
Nov 15, 2024 · iris, in anatomy, the colored muscular part of the eye surrounding the pupil, the small black opening in the center. The iris is located in front of the lens and behind the cornea. It is bathed in front and behind by a fluid known as the aqueous humor.
Human eye - Extraocular Muscles | Britannica
Oct 29, 2024 · Human eye - Extraocular Muscles: Six muscles outside the eye govern its movements. These muscles are the four rectus muscles—the inferior, medial, lateral, and superior recti—and the superior and inferior oblique muscles.
Human ear | Structure, Function, & Parts | Britannica
5 days ago · Human ear, organ of hearing and equilibrium that detects and analyzes sound by transduction and maintains the sense of balance. Anatomically, the ear has three distinguishable parts: the outer, middle, and inner ear. Learn about the …