Histology - Muscle
Previous Page Next Page
Muscle cells are much longer than they are broad, and present different appearances in transverse and longitudinal sections. It is important to recognise them both types of sections. Skeletal muscle is the easiest to start with.
Skeletal muscle can be seen as a separate slide or as a part of other organs. In the collection that you have in the boxes, slides of organs with skeletal muscle may be more illustrative than skeletal muscle sections. However, take a good look at both. The slides include #58 (skeletal muscle l.s. and t.s.), #64 (oesophagus) and #91 (tongue). The slide of oesophagus may present some difficulty as it may have a mixture of skeletal and smooth muscle.
picture shows a mixture of longitudinal and transverse sections of skeletal
muscles (H&E), under the lowest magnification (4x).
This is a part of the same section at a higher magnification, mainly showing
cells cut longitudinally. The long rectangle shows a part of one muscle
cell. Note the cross striations. Remember, the 'peripheral' nuclei of
skeletal muscle cannot be unequivocally identified in a longitudinal
3. Same picture as '2' above, but seen with reduced light - the iris diaphragm has been closed down a bit. This trick often allows us to see the striations better.