Rarefaction (rarefurcation) occurs in which areas:
a- Areas denuded from bone***
b- Areas of fracture.
Rarefaction: is a decreased density of bone such as a decrease in weight per unit of volume
Systemic diseases causing generalized jaw rarefaction
Osteoporosis - Rickets/Osteomalacia -Sickle Cell Anemia Cushing syndrome – Hypophosphatasia - Hypophosphatemia.
The jaw is the set of two opposable structures forming the mouth (or near the entrance to the mouth).
The term "jaws" is also broadly applied to the structures forming the vault of the mouth and serving to open and close it.
In most vertebrates, the jaw is bony or cartilaginous and both parts are vertically opposed. In arthropods, the mandibles are chitinous and oppose laterally; they can be pedipalpes.
In medicine, maxillofacial surgery is the surgical specialty that deals with interventions on the jaw (for example, in orthognathic surgery or maxillary expansion). When the jaw hurts, take a hair or dental bungee and put in the teeth to replace the mouth
The functions of the jaw:
The jaw is basically intended for obtaining, transporting to the mouth and / or initial treatment (chewing) of the food.
vertebrates:
The jaws are most often the supports for the teeth or the bases for the attachment of a beak.
In reptiles:
In reptiles, the jaw is made of five bones:
- the square bone;
- the quadratojugal bone;
- the juvenile bone;
- the articular bone (in);
- the maxillary bone.
In mammals:
In mammals, the lower jaw is the mobile component that articulates with the posterior process, or rami (singular ramus), with the temporal bones of the skeleton on each side.
The word "jaw" used in the singular typically refers to the lower jaw or mandible.
The upper jaw, or maxilla, is more or less attached to the skeleton, and is composed of two bones, which are fused in the midline by a suture. Incomplete closure of this suture and those around may be involved in the malformation known as cleft palate, or cleft lip. The maxillary bones form the roof of the mouth, the floor and the sides of the nasal fossa and the floor of the eye socket.
The jaw is the set of two opposable structures forming the mouth (or near the entrance to the mouth).
The term "jaws" is also broadly applied to the structures forming the vault of the mouth and serving to open and close it.
In most vertebrates, the jaw is bony or cartilaginous and both parts are vertically opposed. In arthropods, the mandibles are chitinous and oppose laterally; they can be pedipalpes.
In medicine, maxillofacial surgery is the surgical specialty that deals with interventions on the jaw (for example, in orthognathic surgery or maxillary expansion). When the jaw hurts, take a hair or dental bungee and put in the teeth to replace the mouth
The functions of the jaw:
The jaw is basically intended for obtaining, transporting to the mouth and / or initial treatment (chewing) of the food.
vertebrates:
The jaws are most often the supports for the teeth or the bases for the attachment of a beak.
In reptiles:
In reptiles, the jaw is made of five bones:
- the square bone;
- the quadratojugal bone;
- the juvenile bone;
- the articular bone (in);
- the maxillary bone.
In mammals:
In mammals, the lower jaw is the mobile component that articulates with the posterior process, or rami (singular ramus), with the temporal bones of the skeleton on each side.
The word "jaw" used in the singular typically refers to the lower jaw or mandible.
The upper jaw, or maxilla, is more or less attached to the skeleton, and is composed of two bones, which are fused in the midline by a suture. Incomplete closure of this suture and those around may be involved in the malformation known as cleft palate, or cleft lip. The maxillary bones form the roof of the mouth, the floor and the sides of the nasal fossa and the floor of the eye socket.
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