What kind of cells line the esophagus?
In many vertebrates, the esophagus is lined by stratified squamous epithelium without glands.
What tissues are in the esophagus?
The esophagus contains four layers—the mucosa, submucosa, muscularis, and tunica adventitia. The mucosa is made up of stratified squamous epithelium containing numerous mucous glands.
Why does the esophagus not have cartilage rings?
In fact, the primary reason is that the oesophagus is located closely behind the trachea and runs down with it. So, in order to provide room for that distension, the trachea has a layer of smooth muscle instead of a cartilaginous layer on the posterior aspect.
How does this epithelium relate to the function of the esophagus?
Non-keratinized stratified squamous epithelial tissue makes up the majority of the mucosa layer and provides protection to the esophagus from rough food particles and acid from the nearby stomach. Mucous glands in the mucosa produce mucus to lubricate the esophagus and help shield the mucosa from stomach acid.
Does esophagus have connective tissue?
For most of its extent, the esophagus is retroperitoneal, so its outermost layer consists of a connective tissue adventitia which merges with the adjacent connective tissue associated with nearby structures (such as the trachea as shown in slide 126).
What does histological analysis of bone marrow reveal?
Histological analysis of the bone marrow will reveal an abundance of progenitor cells and their derivatives at different stages of development. Typically, the progenitor cells are larger than their end products.
How are bone marrow smears used to evaluate erythropoiesis?
•May give a better evaluation of erythropoiesis, since there is no bone present in the specimen, it can be cut thinner, aiding in the evaluation of red cell precursors •The best for immunos… if representative Bone Marrow Smears •The smears are used for qualitative evaluation of the marrow •cell identification •dyspoiesis •maturation
What does a bone marrow smear tell you about a basophil?
Basophils are not phagocytic. While the peripheral blood smear indicates the status of mature blood cells, the bone marrow smear can be used to assess the process of hematopoiesis, or blood cell formation. Active bone marrow appears highly cellular.
What are the components of a bone marrow smear?
Component Cells of a Bone Marrow Smear. The reticulocyte contains cytoplasm, cytoplasmic organelles, and many ribosomes. It is released from the bone marrow and develops into a mature erythrocyte after spending 1 to 2 days in the peripheral blood. Granulopoiesis is the process by which white blood cells develop.