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What are muscles that are primarily responsible for producing a particular movement called?
When a prime mover is active, the fibers of the antagonist are stretched, what state are they in when this occurs?
What can also regulate the prime mover by providing some resistance, to prevent overshoot or to stop its action?
What immobilize the origin of a prime mover so that all the tension is exerted at the insertion?
Direction of muscle fibers, relative size of the muscle, location of the muscle, number of origins, location of the muscle's origin and insertion, shape of the muscle, and the action of the muscle
What are the 7 criterias of naming muscles?
transverse and oblique
What two terms are used when the muscle fibers run at right angles and obliquely to the imaginary line?
A muscle with fibers (and fascicles) running parallel to that imaginary line will have what term?
the number of origins
When numbers are used to identify muscles (bi, tri, quad) what do the numbers represent?
When naming the muscle in regards to the location of its origin and insertions which name comes first?
because they insert into the skin (or other muscles) rather than into bone
Why are the muscles of facial expression different from ost skeletal muscles?
muscles of mastication, and the six extrinsic eye muscles
What other muscles are found on the head besides the muscles of facial expression?
frontal belly of the epicranius
What muscle is used to raise your eyebrow and wrinkle your forehead?
Which muscle is demonstrated when you place your hands on your temples and clench your teeth?
the head and the shoulder girdle
What are the neck muscles primarily concerned with the movement of?
The vertebral column, the ribs, the head, and the arms
What does the trunk musculature cause movement for?
What muscle draws the corner of the mouth laterall; compresses cheek (as in whistling); holds food between teeth during chewing?
What muscle has the lower margin of the mandible, the skin, and the muscle at the corner of the mouth as its insertion?
What muscle tenses the skin of the neck; depresses the mandible; pulls the lower lip back and down (i.e., produces downward sag of the mouth)?
What muscle has the manubrium of the sternum and medial portion of the clavicle as its origin?
What muscle has the mastoid process of the temporal bone and the superior nuchal line of the occipital bone as its insertion?
What muscle has simultaneous contractions of both muscles of pair causes flexion of the neckforward, generally against ressistance (as when lying on the back); acting independently, rotate head toward shoulder on opposite side?
Sternohyoid and the sternothyroid
What muscles is acting with the sternothyroid and omohyoid depresses larynx and hyoid bone if mandible is fixed; may also flex skull?
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