Question

why oesophagus does not hai cartilaginous ring. dont give Google ans​

Answer 1

Answer:

Rings and webs are the most common structural abnormalities of the esophagus. The terminology, pathogenesis, and treatment of these esophageal lesions remain controversial. The terms rings and webs often are used interchangeably in the literature. The pathogenesis and treatment of esophageal rings and webs are evolving. Most of these structural lesions are asymptomatic but can cause dysphagia. This review attempts to provide a practical update on esophageal rings and webs and to discuss their definition, epidemiology, pathophysiology, clinical presentation, differential diagnosis, diagnosis, treatment, and follow-up care.

An esophageal ring is defined as a concentric, smooth, thin (3-5 mm) extension of normal esophageal tissue consisting of three anatomic layers of mucosa, submucosa, and muscle. An esophageal ring can be found anywhere along the esophagus, but it usually is found in the distal esophagus. Three types of esophageal rings exist, and they are classified alphabetically as A, B, and C, as illustrated below.