This new study reveals that keratinous
beaks played an important role in stabilizing the skeletal structure during feeding, making the skull less susceptible to bending and deformation.
Key Words: Chalazion, curettage, keratinous
cyst, tatsal plate, tumor
It is clear from our results that soils of Gardens and playgrounds are ideal environment for the growth of keratinophilic fungi and dermatophytes, and this could be attributed to the high organic debris and keratinous
substrates like hair and feathers from birds and animals and plant litter present in these soils.
Copious amounts of thick, dark cerumen and keratinous
debris were expressed from the sinus tract when postauricular pressure was applied (figure 4).
Others suggest that it may originate from chronic abscess or keratinous
cysts of breast12,13.
C] values of eastern Aleutian foragers subsisting high in the marine food web represent a further averaging of intraspecific variation, since in both human and ingested prey tissues (unlike baleen, a keratinous
protein metabolically inactive after formation) carbon is subject to continuous turnover.
A This can happen in younger birds when they are sexually mature, finally developing either a blue cere (the soft keratinous
structure above the beak) in males or brown cere in females.
However it bears deep lateral grooves for the attachment of what was probably a substantial keratinous
claw and possessed (prior to post-mortem damage) a robust flexor tubercle.
In humans, aspirates may contain squamous cells, polymorphonuclear cells, lymphocytes, and a background of amorphous and keratinous
The giant comedones seen over the upper back and occasionally on the face are also associated with photodamage, and I suspect that they are passively allowed to dilate with the keratinous
debris because of the loss off perifollicular dermal support--exactly analogous to the situation with the microvasculature.
Histologically, the tumors contain varying amounts of: nests of cuboidal/polygonal cells, tubuloalveolar structures, ductal structures, keratinous
cysts and matrix (chondroid substance is the most prevalent).
When an abnormal amount of keratinous
(skin) debris collects in the pilosebaceous unit and doesn't get shed properly, this debris creates a plug, called a comedone (co-mee-done).