Longitudinal Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Longitudinal and links to relevant pages within the course.
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|The terms "superior" and "inferior" are used to indicate a position or relationship and can be translated to mean the same as:||View Page|
|Commonly Used Anatomic Direction Terms|
TermMeaningSagittal A longitudinal, vertical plane that divides into right and left sides.Mid-sagittalA plane which divides the body into anterior and posterior.InferiorThe bottom half, toward the feet.CaudalLocated at or near the hind or posterior of the body. Means the same as "dorsal" and "posterior."InferiorBeneath. Used to reference an under-structure or something below another referenced structure.SuperiorThe top half, toward the head.DistalAway from the center.Cross-sectionA plane formed by cutting though an object at right angles to an axis, which provides a representative sample of most parts contained within the whole.ProximalNearest to a point of reference, such as a point of origin.Horizontal (transverse)A plane that is parallel to the ground.
Appendix specimens submitted to histology will typically include transverse sections of the base and longitudinal sections of the tip (which may be bisected). Orientation will include orientation of any lumen openings of tubular pieces with "on end " orientation to show the lumen openings in cross-section. Any bisected longitudinal pieces should be oriented to show the inner surface and layers present.
|A small tubular artery is received in histology to rule out temporal arteritis. When embedding this specimen, how must the sections of the tube must be oriented?||View Page|
|Illustrated here is a single conidium of Microsporum canis. Note that the hilar cell appears fractured (shorter red arrow), where it was released from the stolon. Macroconidia having this so-called "break-away" cell are termed:||View Page|
|Match the names of each of the fungi listed with its appropriate category depending upon whether the multi-celled macroconidia are divided by both longitudinal and transverse septa (dictyospores); or, are divided by only transverse septa.||View Page|
|The multi-celled conidia of this dematiaceous mold are divided into cells by what are called distosepta (pseudosepta), indicating that the individual cells are surrounded by a sac-like wall that is distinct from the outer cell wall of the conidium. The identification of this mold is:||View Page|
|The oval or curved multi-celled, dark-staining macroconidia divided by transverse septa only is characteristic of:||View Page|
|The chain of conidia illustrated in this photomicrograph, with the deep-staining truncated bases, are called annelloconidia, and are most characteristic of:||View Page|
Mucous threads are semi-transparent under brightfield microscopy and could be mistaken for hyaline casts. They occur as ribbon-like strands with poorly defined edges, pointed or split ends and longitudinal striations.
|Mucous Threads Under Phase Contrast|
Under phase contrast, mucous threads appear much darker. Longitudinal striations and pointed ends are easily visible.