ORIENTATION OF MUSCLE FIBERS normal paraffin  Cut 3 mm off one of the clamped pieces and place immediately in EM fixative (e.g, Karnovsky’s)  Take.

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Presentation transcript:

ORIENTATION OF MUSCLE FIBERS

normal paraffin

 Cut 3 mm off one of the clamped pieces and place immediately in EM fixative (e.g, Karnovsky’s)  Take the rest from the clamped piece and place in formalin to be later embedded in paraffin (cross section and longitudinal)

Processing the Biopsy: Cryostat Sections Mounting the specimen Perpendicular to gum

Processing the Biopsy: Cryostat Sections Freezing the specimen – 160 deg C Inner flask with isopentane or methylbutane Outer flask with liquid nitrogen Grab chuck with tongs, turn upside down and plunge into center flask and swirl for about a minute

Processing the Biopsy: Cryostat Sections

If it will arrive within a few hrs, send one piece on saline MOISTENED, not soaked, gauze or a telfa pad, place in a ziplock bag, and keep cool (use cooler with icewater) but do not freeze. Send overnight specimens after freezing in plenty of dry ice Send the other piece in formalin or divide for EM too if possible If there is a 3 rd piece, send it fresh with the cooled specimen (or frozen for overnight)