example noteworthy characteristics medschool

#Example noteworthy characteristics medschool skin
#Example noteworthy characteristics medschool free

Webslide 0093_N: recto-anal junction, mammal, H&E Large diameter blood vessels are also present Nerve bundles, especially where cut transversely, should be recognizable. Smaller isolated patches of skeletal muscle, many longitudinally oriented, probably represent the voluntary skeletal muscle responsible for changing the shape of the lips, such as depressor labii inferioris or levator labii superioris. It serves to close the mouth and is one of the muscles of facial expression innervated by the 7th cranial nerve. The large mass of skeletal muscle in the center line of the section is part of the sphincter-like orbicularis oris. Note the large mass of mucous glands in the dermis under the moist epithelial surface. What two obvious structural modifications enable you to identify which surface is which?

#Example noteworthy characteristics medschool free

On this slide, two free epithelial surfaces are visible, the outermost epidermis (on the top) and the moist (mucous) surface that lines the oral cavity.

What modifications of cell structure distinguish duct from gland?.

How do coiled tubes appear in sections?.

Sweat glands and ducts passing toward the epidermis.

The appearance of nerve and blood vessels.

What are the advantages of draping the epidermis upon dermal papillae?.Are there capillaries in the epidermis?.Dermal papillae containing capillary loops.

Clear melanocytes and Langerhans cells.

Is there any particular orientation to their deposition? What functional significance might this have?

The melanosomes - especially in the basal cells.

Note the progression of cell changes from S.

Observe at high power the following features. In the slide, the spongy masses of fat mark the indistinct boundary.ī.

#Example noteworthy characteristics medschool skin

In the latter, skin is separated from superficial fascia at the dermis-hypodermis junction by careful dissection, taking care that the fat that characterizes hypodermis does not come away with the peeled skin. The separation between dermis and hypodermis is less easily made with the microscope than in the gross lab. Subtle textural differences separate the upper papillary layer from the lower reticular layer. Observe the distinctive appearance of the dermis: dense, irregular connective tissue characterized by thick dermal papillae, sections of criss-crossing collagen fiber bundles, and masses of tubular sweat glands cut in various sections. How thick is the epidermis? The cornified layer? Examine this slide at low power to observe major structural characteristics and variations of the epidermis. Webslide 0058_L: Thin Skin, human, H&E Ī. Please ask your instructor when you need assistance.Try to develop a sense of continuity of structure from whole organ to histological architecture, to cellular detail, to intracellular microstructure, to macromolecular arrangement.Attempt to locate exemplary areas that resemble figures in your atlas or text as closely as possible.Survey a webslide first with the lowest objective setting and then observe it at progressively higher objective settings.Understand what you expect to see based on the lectures, lab manual, computer atlas (Histology Time), and textbook.Try to visualize how various profiles result from sections at different angles and levels through solid geometrical forms.Ī few reminders about the most effective use of each webslide with the available tools: Remember: You must derive the three dimensional morphology of the structures you are studying from essentially two dimensional tissue sections under the microscope. At the same time you should review the various tissue types that make up this organ. Your attention in this work period is directed to the epithelial differentiations that serve the functions of a multifunctional organ, skin.