组胚标本考试（Group embryo examination）.docVIP

组胚标本考试（Group embryo examination） Examination of histology and Embryology Name: skeletal muscle Structure characteristics under light microscope: Longitudinal muscle fibers: zonal / long column; nuclear multiple, long oval / rod-shaped, close to below the muscle membrane; there is bright and dark stripes on the muscle fiber. Transverse view: muscle fibers are irregularly shaped or round, with nuclei ranging from 1 to several, punctate, located in the periphery. Name: myocardium Structure characteristics under light microscope: (heart fibers are arranged in a more complex direction and see sections at the same time.) Longitudinal view: the cardiac fiber is short columnar and has branches attached to the web. The nucleus is ovoid and located in the center. Myocardial fibers are striated, but not as distinct as skeletal muscle. At the distance between the fibers of the myocardium, there is a darker line at the junction, the intercalated disk. Transverse view: the fibers are round or irregular in size, with the nucleus located in the center and some without cutting into the nucleus. Name: spinal cord (neuron) Structure characteristics under light microscope: In the anterior horn, multipolar neurons can be seen. The soma is large and irregular in shape, and the projection of the cell body is often severed. The nucleus is located in the center of the cell body. It is large and round, with weak staining and obvious nucleoli. The cytoplasm is purple red, and many small purple and blue patches of different sizes can be found in the cytoplasm, namely Nissl body. The dendrites contained Nissl bodies, axons, and axis mounds. Middle and middle vein Structure characteristics under light microscope: (1) the internal and external elastic membranes of the middle artery are divided into three layers: the intima, the tunica media and the adventitia 1. the intima is thin and the endothelial cells protrude into the lumen. (the lower endothelium is a very thin connective tissue that is di