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Eyelash length is closely linked to the width of the eye, with the lashes typically growing to one-third the width of the eye as an evolutionary adaptation to reduce tear film evaporation and dust deposition. Lashes longer or shorter than one-third the width of the eye have been shown to have reduced efficacy in serving their function. [5]
The eyebrows, eyelids, eyelashes, lacrimal gland and drainage apparatus all play a crucial role with regards to globe protection, lubrication, and minimizing the risk of ocular infection. [1] The adnexal structures also help to keep the cornea moist and clean. One source defines "ocular adnexa" as the orbit, conjunctiva, and eyelids. [2]
The nail is an unguis, meaning a keratin structure at the end of a digit. Other examples of ungues include the claw, hoof, and talon. The nails of primates and the hooves of running mammals evolved from the claws of earlier animals. [38] In contrast to nails, claws are typically curved ventrally (downwards in animals) and compressed sideways.
Note that the lashes in the outer portion of the eyelid are not pushed by the eyelid and curl upwards. In some individuals, an eyelid with excessive skin may push the eyelashes downwards and into the eye, obstructing vision in the case of long and thick lashes, and potentially causing corneal abrasion. [13]
Nail (anatomy), toughened protective protein-keratin (known as alpha-keratin, also found in hair) at the end of an animal digit, such as fingernail Nail (beak) , a plate of hard horny tissue at the tip of some bird beaks
In human anatomy, the eponychium is the thickened layer of skin at the base of the fingernails and toenails. [1] It can also be called the medial or proximal nail fold. The eponychium differs from the cuticle; the eponychium comprises live skin cells whilst the cuticle is dead skin cells.
“One literally broke in half and started bleeding, [but] a majority of the time, my nails are normally either this long or I’ve had longer,” Chiles added, flashing a glimpse at her manicure.
Nail anatomy (5 P) C. Nail care (1 C, 19 P) Pages in category "Nails (anatomy)" The following 17 pages are in this category, out of 17 total.