Submissive grinning, sometimes called smiling, is when a dog pulls up their front lips to expose their teeth (check out a video here and a photo here) and it often occurs during an initial greeting (dog to human, dog to dog).
There are three main functions that the muscle fascia performs: 1  The fascia holds the muscle together and keeps it in the correct place. 2  The fascia separates the muscles so they can work independently of each other. 3  The fascia provides a lubricated surface so that the muscles can move smoothly against each other.here are three main types of fascia: 1  Superficial Fascia, which is mostly associated with the skin; 2  Deep Fascia, which is mostly associated with the muscles, bones, nerves and blood vessels; and. 3  Visceral (or Subserous) Fascia, which is mostly associated with the internal organs.
Muscle fibers within the fascicle are surrounded by endomysium (320x). connective tissue, therefore, enclose and separate all parts of a skeletal muscle. This arrangement allows the parts to move somewhat independently. Also, many blood vessels and nerves pass through these layers.hese sections contain bundles of skeletal muscle fibers called fascicles (fasciculi). Each muscle fiber within a fascicle (fasciculus) lies within a layer of connective tissue in the form of a thin covering called endomysium (figs. 9.2 and 9.3).