The digestive tract is generally not associated with lymphoid tissue, with the exception of small collections of lymphocytes such as Peyer's patches.
Smooth muscle tissue is located in the wall of the digestive tract.
The nasopharyngeal lymphatic tissue is the mucosal lymphoid tissue of the respiratory tract.
That system is called as lymphoid system.
epithelium
epithelial tissue.
Lymphoid tissue includes the lymph nodes, spleen, thymus, bone marrow and "tonsils" which are located in the throat.The tonsils are lymphoid tissue which line the pharynx or throat.Nasopharyngeal indicates the area of the internal openings of the nose and mouth.Names and locations of tonsillar divisions: Adenoids = aka Pharyngeal tonsils or Luschka located at the nose.Tonsils = aka Palatine located at the oropharynx (back of the mouth).Tubal = located at the opening of the auditory tubes.Lingual = located at the tongue "root".Cerebral = located above the nasal openings.Nasal = located within the nasal cavity
Four layers of tissue form the walls of the digestive tract. These layers are called mucosa, submucosa, muscularis externa and adventitia.
endoderm
mucosa
Peristalsisis a radially symmetrical contraction and relaxation of muscles which propagates in a wave down the muscular tube, in an anterograde fashion. In humans, peristalsis is found in the contraction of smooth muscles to propel contents through the digestive tract. Earthworms use a similar mechanism to drive their locomotion.[1] The word is derived from New Latin and comes from the Greek peristallein, "to wrap around," from peri-, "around" +stallein, "to place".
Receptors located solely in the digestive tract.
Mucosa