Jaw muscle development and metamorphosis in tadpoles of Eastern Narrowmouth toads Gastrophryne carolinensis: Development of the head and neck. Wikipedia articles with TE identifiers. Exogenous retinoic acid during gastrulation induces cartilaginous and other craniofacial defects in Fundulus heteroclitus. Nuclei of cartilage stippled.
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A diverticulum is an abnormal sac or pouch that develops at a weak point in the intestines. Various types of diverticula can develop as you age. In 95 percent of people with this condition, the diverticulum that develops is made up of intestinal cells.
As a result, the diverticulum functions as a normal part of the intestine. This type of diverticulum may not cause any significant symptoms. In other instances, the diverticulum may be made up of stomach or pancreatic cells. When this occurs, the diverticulum will function differently from the intestines. This may result in significant symptoms. For example, infants with the condition are more likely to have a blockage in their intestines. Intestinal bleeding and bloody stools are more common in older children with the condition.
The remaining cases are typically diagnosed in adolescence. When this occurs, you may notice blood in your stool for several days, followed by a period of normal stool. Erratic symptoms can make the condition difficult for your doctor to diagnose. If this happens, emergency surgery may be needed to remove the diverticulum. They will recommend several different tests to confirm the diagnosis. Blood tests will determine if your red blood cell count is low.
This will help your doctor determine if bleeding is occurring in the intestines. In addition, your doctor may order a stool smear. In this test, a sample of your stool is analyzed to see if it contains blood. Your doctor may also order a technetium scan. This test uses a dye that can be viewed with a special camera. The dye will be injected into your veins and will collect around the diverticulum.
This will help your doctor to see the pouch in your intestines. This may make it difficult to view the diverticulum through the technetium scan. If this occurs, your doctor may need to order different tests to confirm diagnosis.
A colonoscopy or uppergastrointestinal endoscopy may be ordered. These tests use a camera to visualize the diverticulum. Those who experience symptoms due to the condition may need to have surgery to remove the diverticulum. Surgery typically includes removal of the diverticulum and repair of the intestines.
If the intestines have been damaged as a result of the diverticulum, the damaged part of the intestine may also need to be removed. However, some complications can arise following surgery. In particular, scar tissue may develop, which could cause a blockage of the intestines.
Blockage of the intestines can be life-threatening and may require additional surgery to remove the blockage. Surgical removal of the diverticulum typically results in normal intestinal function. Surgery also stops blood loss.
CARTILAGO DE MECKEL PDF
References in periodicals archive? The intervening part of the cartilage disappears; the portion immediately adjacent to the malleus is replaced by fibrous membrane, which constitutes the sphenomandibular ligamentwhile from the connective tissue covering the remainder of the cartilage the mckel part of the mandible is ossified. Mandible of human fetus 95 mm. In early fish and in chondrichthyans cartilaginous fish such as sharksthe Meckelian Cartilage continued to be the main component of the lower jaw. A tough, elastic, fibrous connective tissue that is a major constituent of the embryonic and young vertebrate skeleton and in most species is converted largely to bone with maturation. In all tetrapods the cartilage partially ossifies changes to bone at the rear end of the jaw and becomes the articular bone, which forms part of the jaw joint in all tetrapods except mammals. The dorsal end of each cartilage is connected with the ear-capsule and is ossified to form the malleus ; the ventral ends meet each other in the region of the symphysis mentiand are usually regarded as undergoing ossification to form that portion of the mandible which contains the incisor teeth.
Cartílago de Meckel
A strong, flexible connective tissue that is found in various parts of the body, including the joints, the outer ear, and the larynx. Development of the head and neck. Then it grew longer and stronger, and acquired muscles capable of closing the developing jaw. Gristle; acrtilago, white connective tissue cushioning bones and supporting parts of the ear and respiratory system. The dorsal end of each cartilage is connected with the ear-capsule and is ossified to form the malleus ; the ventral ends meet each other in the region of the symphysis mentiand are usually regarded as undergoing ossification to form that portion of the mandible which contains the incisor teeth. Pharyngeal apparatus Pharyngeal groove Cervical sinus Pharyngeal arch Pharyngeal pouch.