Histology Slides

puwatopa's version from 2016-09-15 00:01

Section 1

Question Answer
Trachea- Pseudostratified Ciliated Epithelium
Bladder- Transitional Epithelium, detrusor muscle (the smooth muscle under the connective tissue) identified by its irregular thickness and nucleus size and shape in the epithelium
(Loose) Areolar Connective Tissue Cushions internal organs Location: Around internal organs What to look for: Loose network of pink and black strands (collagen and elastic fibers) the small dots are fibroblasts
Adipose Tissue adipose cells are fat-storing chambers inbetween a cytoplasmic membrane
Reticular Connective Tissue- Although present as the supportive tissue of lymph nodes, glands, organs, and bone marrow, reticular connective tissue is not that obvious. Small, branching, collagen fibers that form the reticular connective tissue are usually hidden from view by the numerous lymphatic, epithelial, or bone marrow cells anchored to them.
Dense Irregular Connective Tissue- collagen fibers are laid out in an irregular pattern. This connective tissue can be found in many places, specifically in the dermis of the skin. Remember that the "cell nuclei" are correctly termed as fibroblasts
Elastic Connective Tissue- Not to be confused with elastic cartilage, elastic connective tissue has many elastic fibers which run in mostly one direction. The small nucleus like "dots" scattered around are called fibroblasts
Hyaline Cartilage- has a very distinctive appearance which contains a background substance called a matrix. The "holes" are called lacunae and the darker nuclei-looking structures are the chondrocytes.
Fibrocartilage- Notice the wavy fibers of fibrocartilage and the "holes" (lacunae) made by the chondrocytes and the small interior dots are the chondrocytes
Elastic Cartilage- Note the large volumes of elastic fibers. The large "holes" in between the fibers are the lacunae and within the lacunae lie the chondrocytes (the "nuclei" of the cartilage.)
Compact Bone- Notice the Haversian Canal in the center and the branching cannaliculi which run through the concentric lamellae to the different lacunae.
Blood: RBC and Platelets- The Red arrows are pointing to Erythrocytes (RED BLOOD CELLS). They are biconcave discs with that distinguishing hollow center which is the thinnest part of the cell. The blue arrow are pointing to platelets (blood coagulation)
Blood: Neutrophil- Granulocyte The way to distinguish these cells from the others is the 3 Lobed Nuclei. They are the most numerous leukocyte. They play a major role in phagocytosis of bacteria.(55%)
Blood: Lymphocyte- a type of agranulocytic white blood cell involved in the human body's immune system. There are two broad categories of lymphocytes, namely T cells and B cells. Lymphocytes play an important part of the body's defenses (33%)
Blood: Monocyte- Agranulocyte They are the main phagocytes of the human body, when it leaves the blood, it becomes a macrophage (8%)
Blood: Eosinophils- Granulocyte Notice the characteristic Bi-lobed nuclei. Eosinophils play a major role in defense against parasites. High eosinophils count = parasite infection.(3%)
Blood Granulocyte: Basophil- less than 1% of WBC are basophils. Basophils have the same kind of granules as those found in Mast Cells

Section 2

Question Answer
Irregular Connective Tissue and Smooth Muscle- The top slide is a section of the small intestine showing smooth muscle in the lower right and dense irregular connective tissue in the upper left. Note how the smooth muscle forms neat, parallel lines, whereas the dense irregular connective tissue is more wavy and less organized.
Cardiac Muscle- I= Intercalated discs, N= Nucleus, Arrow= Branching fiber
Skeletal Muscle- Note the striations and the nuclei of the fibers being along side the fibers rather than inside the fibers