Squama
Encyclopedia
Squama refers to a structure shaped like the scale
of a fish
. More specifically, it can refer to:
Squamous epithelium
refers to epithelium, e.g. the skin, composed of squamous cells.
See also:
Scale (zoology)
In most biological nomenclature, a scale is a small rigid plate that grows out of an animal's skin to provide protection. In lepidopteran species, scales are plates on the surface of the insect wing, and provide coloration...
of a fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...
. More specifically, it can refer to:
- Squama frontalisSquama frontalisThere are two surfaces of the squama of the frontal bone: the external surface, and the internal surface.-External surface:The external surface is convex and usually exhibits, in the lower part of the middle line, the remains of the frontal or metopic suture; in infancy this suture divides the bone...
- Squama occipitalisSquama occipitalisThe squama of the occipital bone, situated above and behind the foramen magnum, is curved from above downward and from side to side.- External surface :...
- Squama temporalisSquama temporalisThe squama of the temporal bone forms the anterior and upper part of the bone, and is scale-like, thin, and translucent.- Surfaces :Its outer surface is smooth and convex; it affords attachment to the temporalis muscle, and forms part of the temporal fossa; on its hinder part is a vertical groove...
, the squamous portion of the temporal boneTemporal boneThe temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebrum.The temporal bone supports that part of the face known as the temple.-Parts:The temporal bone consists of four parts:* Squama temporalis... - Squamous cell
Squamous epithelium
Epithelium
Epithelium is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the cavities and surfaces of structures throughout the body, and also form many glands. Functions of epithelial cells include secretion, selective...
refers to epithelium, e.g. the skin, composed of squamous cells.
See also:
- DesquamationDesquamationDesquamation , also called skin peeling, is the shedding of the outermost membrane or layer of a tissue, such as the skin.-Skin:Normal, nonpathologic desquamation of the skin occurs when keratinocytes, after moving apically over about 14 days, are individually shed unnoticeably...