Information about Ossification Of The Mandible
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Figure 3: Mandible of human embryo 24 mm. long. Outer aspect.
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Figure 4: Mandible of human embryo 24 mm. long. Inner aspect.
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Figure 5: Mandible of human embryo 95 mm. long. Outer aspect. Nuclei of cartilage stippled.
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Figure 5: Mandible of human embryo 95 mm. long. Inner aspect. Nuclei of cartilage stippled.
These cartilages form the cartilaginous bar of the mandibular arch (see p. 66), and are two in number, a right and a left.
Their proximal or cranial ends are connected with the ear capsules, and their distal extremities are joined to one another at the symphysis by mesodermal tissue.
They run forward immediately below the condyles and then, bending downward, lie in a groove near the lower border of the bone; in front of the canine tooth they incline upward to the symphysis.
From the proximal end of each cartilage the malleus and incus, two of the bones of the middle ear, are developed; the next succeeding portion, as far as the lingula, is replaced by fibrous tissue, which persists to form the sphenomandibular ligament.
Between the lingula and the canine tooth the cartilage disappears, while the portion of it below and behind the incisor teeth becomes ossified and incorporated with this part of the mandible.
Ossification takes place in the membrane covering the outer surface of the ventral end of Meckel's cartilage (Figs. 178 to 181), and each half of the bone is formed from a single center which appears, near the mental foramen, about the sixth week of fetal life.
By the tenth week the portion of Meckel's cartilage which lies below and behind the incisor teeth is surrounded and invaded by the membrane bone.
Somewhat later, accessory nuclei of cartilage make their appearance:
- a wedge-shaped nucleus in the condyloid process and extending downward through the ramus;
- a small strip along the anterior border of the coronoid process;
- smaller nuclei in the front part of both alveolar walls and along the front of the lower border of the bone.
The inner alveolar border, usually described as arising from a separate ossific center (splenial center), is formed in the human mandible by an ingrowth from the main mass of the bone.
At birth the bone consists of two parts, united by a fibrous symphysis, in which ossification takes place during the first year.
The foregoing description of the ossification of the mandible is based on the researches of Low 44 and Fawcett, 45 and differs somewhat from that usually given.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
mandible (from Latin mandibūla, "jawbone") or inferior maxillary bone is, together with the maxilla, the largest and strongest bone of the face . It forms the lower jaw and holds the lower teeth in place.
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The cartilaginous bar of the mandibular arch is formed by what are known as Meckel’s cartilages (right and left) ; above this the incus is developed.
The dorsal end of each cartilage is connected with the ear-capsule and is ossified to form the malleus; the ventral
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The dorsal end of each cartilage is connected with the ear-capsule and is ossified to form the malleus; the ventral
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The first branchial arch, also called the first pharyngeal arch and mandibular arch, is the first of six branchial arches that develops in fetal life. It is located between the stomodeum and the first pharyngeal groove.
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A symphysis is a fibrocartilaginous fusion between two bones. The more prominent symphyses are:
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- the pubic symphysis
- the symphyses between the bones of the skull, most notably the mandible (symphysis menti)
- sacrococcygeal symphysis
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The germ layer mesoderm forms in the embryos of animals more complex than cnidarians, making them triploblastic. Mesoderm forms during gastrulation when some of the cells migrating inward to form the endoderm form an additional layer between the endoderm and the ectoderm.
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This article or section may be confusing or unclear for some readers.
Please [improve the article] or discuss this issue on the talk page. This article has been tagged since December 1909.
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Please [improve the article] or discuss this issue on the talk page. This article has been tagged since December 1909.
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A symphysis is a fibrocartilaginous fusion between two bones. The more prominent symphyses are:
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- the pubic symphysis
- the symphyses between the bones of the skull, most notably the mandible (symphysis menti)
- sacrococcygeal symphysis
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malleus or hammer is a hammer-shaped small bone or ossicle of the middle ear which connects with the incus and is attached to the inner surface of the eardrum. The word is Latin for hammer.
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- For the record label, see Incus Records.
The incus or anvil is the anvil-shaped small bone or ossicle in the middle ear. It connects the malleus to the stapes. It was first described by Alessandro Achillin of Bologna.
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The sphenomandibular ligament (internal lateral ligament) is a flat, thin band which is attached above to the spina angularis of the sphenoid bone, and, becoming broader as it descends, is fixed to the lingula of the mandibular foramen.
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The condyloid process is thicker than the coronoid, and consists of two portions: the condyle, and the constricted portion which supports it, the neck.
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Condyle
The condyle presents an articular surface for articulation with the articular disk of the temporomandibular..... Click the link for more information.
The Coronoid process (from Greek korone, "like a crow's beak") can refer to:
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- The coronoid process of the mandible, part of the ramus mandibulae of the mandible
- The coronoid process of the ulna
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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