What is squamosal in biology?

(skwəˈməʊsəl) n. (Zoology) a thin platelike paired bone in the skull of vertebrates: in mammals it forms part of the temporal bone. adj.

What is the squamosal suture?

Abstract. The squamosal suture is one of the lateral minor skull sutures, separating the parietal and squamous temporal bones. While the phenotypic appearances and sequelae of synostosis of the major cranial vault sutures are well documented, little is reported concerning synostosis of the squamosal suture (SQS).

Do humans have a squamosal?

The squamosal is a bone of the head of higher vertebrates. It is the main part of the cheek region in the skull, towards the back and lower part of the skull. In mammals, including humans, it fuses with other bones to form the temporal bone. It is then called the ‘squama temporalis’.

Where is the Squamosal bone located?

temporal bone
Anatomy. of or relating to the thin, scalelike portion of the temporal bone that is situated on the side of the skull above and behind the ear.

Do humans have mandibles?

In anatomy, the mandible, lower jaw or jawbone is the largest, strongest and lowest bone in the human facial skeleton. It forms the lower jaw and holds the lower teeth in place. The mandible sits beneath the maxilla.

What is a Premaxilla?

: either of a pair of bones of the upper jaw of vertebrates between and in front of the maxillae.

At what age does the Squamosal suture close?

around 26 and 60 years
The sagittal suture is the first to close, typically at around 22 years of age; the coronal suture closes at around 24 years; and the lambdoid and squamosal sutures close at around 26 and 60 years, respectively (2). Premature fusion with osseous bridging is possible in all of these sutures.

What is the purpose of Squamosal suture?

The squamosal suture (squamous suture) arches backward from the pterion and connects the temporal squama with the lower border of the parietal bone: this suture is continuous behind with the short, nearly horizontal parietomastoid suture, which unites the mastoid process of the temporal with the region of the mastoid …

Do all animals have jaws?

No other animals have chins – chimpanzee and ape jaws slant inwards for instance. Even our closest extinct relatives such as Neanderthals did not have them. “That is what makes the appearance of chins in anatomically modern humans so interesting.

Do reptiles have jaws?

Jaw. In lizards and other reptiles, the lower jaw (mandible) is formed from several bones joined together. This multi-part mandible is the original vertebrate style, as found in fish and amphibians. Mammals, in contrast, have a single bone forming each side of the mandible.

At what age does the squamosal suture close?

Where is the pterion?

The pterion is a craniometric point near the sphenoid fontanelle of the skull. It is a point of convergence of the sutures between the frontal, sphenoid, parietal, and squamous temporal bones [1].

What is the medical definition of the word squamosal?

Medical Definition of squamosal (Entry 2 of 2) 1 : squamous sense 2. 2 : of, relating to, or being a bone in the skull of many vertebrates that corresponds to the squamous portion of the temporal bone in humans.

Where is the squamosal bone located in the skull?

Squamosal bone. The squamosal is a bone of the head of higher vertebrates. It is the principal component of the cheek region in the skull, lying below the temporal series and otic notch and bounded anteriorly by the postorbital.

Is the parietomastoid the same as the squamosal suture?

The term parietotemporal suture may refer to both of these sutures or exclusively to the parietomastoid suture and its use is, therefore, best avoided. Animation. Left parietal bone removed. Squamosal sutures shown in red. Parietal bones (above) and temporal bones (below). Side view of the skull. Squamosal suture indicated by the black arrows.

When does the squamosal suture begin to close?

Along with growth of the pterion, the asterion and at the frontozygomatic suture, growth at the squamous suture contributes to the vertical height of the cranium during skeletal maturation 1 . The squamosal suture may not completely close until 60 years of age. 1.