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Gross Anatomy of the Skeletal Muscular System
Terms in this set (29)
Muscle Belly (or Muscle Body)
The whole unit of a skeletal muscle, the level of organization at which the muscle is named (eg biceps brachii, or pectoralis major). Muscle bellies of skeletal muscle can be found in a variety of shapes and sizes, but all have the same basic composition
the connective tissue which covers the muscle belly, is continuous with the tendons
the thread-like subdivision of a singe muscle belly, can be grossly observed on cross- section of an intact muscle, many come together to form a muscle belly. similar to the muscle belly, they are also covered in connective tissue
the connective tissue which covers the individual muscle fasciculi and serves to hold the fascicles together. is also continuous with the tendons
muscle fibers (myofibers)
are truly muscle cells or myocytes (thus they re NOT grossly visible). the muscle fiber contains the nuclei (skeletal muscle cells have many nuclei and are this known as multinucleate), the mitochondria, and other parts associated with the inside of a basic cell. the muscle fibers generally travel the entire length of the muscle belly. the myofibers are also covered by a connective tissue.
the connctive tissue which covers muscle fibers and holds the fibers together to form a single fascicle. is also continuous with the tendons. although this tissue surrounds the muscle cells, it is not to be confused with the cell membrane.
semi- permeable special membrane of the skeletal muscle cell (myofiber). cell components are within. the skeletal muscle cell has special intracellular components which differ slightly from a model cell- eg the sacroplasmic reticulum and the sacroplasma.
the point of attachment of a muscle which does NOT move (or moves very little) during normal muscle contraction. typically the end of the muscle which is more proximal primarily, and secondarily caudal
the point of attachment of a muscle which does move during normal muscle contraction. typically the end of the muscle which is more distal primarily, and secondarily cranial
tough band of regular dense connective tissue which connects a muscle to a bone
a broad, flat tendon. great examples are found at the fascia like insertions of the abdominal muscles, or attachment to lumbar vertebrae- through several other exist as well.
thin fibrous connective tissue which covers, binds, or supports muscles. skin is connected to muscle by it.
either smooth or striated muscles that surround an opening (eg anal sphincter, cardiac sphincter...)
a muscle which decreases the angle of the joint found nearest that muscle's insertion.
a muscle which increases the angle of the joint found nearest that muscle's insertion.
movement in which the angle between two bones is decreased
movement in which the angle between two bones is increased up to 180 degrees
movement in which the angle between two bones is increased beyond 180 degrees
a muscle which moves an appendage AWAY from the median plane
a muscle which moves an appendage TOWARD from the median plane
a muscle which draws a part ANTERIORLY
a muscle which draws a part POSTERIORLY
a muscle which rotates a bone
movement of an appendage AWAY from the median plane
movement of an appendage TOWARD from the median plane
movement in which the proximal end is stationary at the point, the distal end traces a circle (thus tracing a cone shape in space). eg arm circles
movement resulting in the rotation of an extremity so the dorsal surface is uppermost
movement that rotates the extremity so that the palmar/ plantar aspect is uppermost
twisting movement about an axis. movement of the head to say "NO" is a good example.
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