erector spinae
the erector spinae (e - rektor spine) group is the prime mover of back extension. these paired muscles are deep (1. ) of the back (figure 6.18b). each erector spinae is a composite muscle consisting of three muscle columns (longissimus, iliocostalis, and spinalis) that collectively span the entire length of the vertebral column. these muscles not only act as powerful back extensors (\erectors\) but also provide (2. ) that helps control the action of bending over at the waist. following injury to back structures, these muscles go into spasms, a common source of lower back pain.
quadratus lumborum
the fleshy quadratus lumborum (qwad - ratus lum - borum) muscles form part of the posterior (3. ) wall. acting separately, each muscle of the pair flexes the spine laterally. acting together, they extend the lumbar spine. these muscles arise from the iliac crests and insert into the upper lumbar vertebrae (figure 6.18b).
deltoid
the deltoids are fleshy, triangle - shaped muscles that form the rounded shape of your shoulders. because they are so bulky, they are a favorite (4. ) site (figure 6.19) when relatively small amounts of medication (less than 5 ml) must be given intramuscularly (into muscle). the origin of each deltoid winds across the shoulder girdle from the spine of the scapula to the clavicle. it inserts into the proximal humerus. the deltoids are the (5. ) movers of arm abduction.

o 1. abdominal 2. injection 3. prime 4. muscles 5. resistance
o 1. prime 2. muscles 3. resistance 4. abdominal 5. injection
o 1. muscles 2. resistance 3. abdominal 4. injection 5. prime
o 1. resistance 2. abdominal 3. injection 4. prime 5. muscles
o 1. injection 2. prime 3. muscles 4. resistance 5. abdominal

Question

erector spinae
the erector spinae (e - rektor spine) group is the prime mover of back extension. these paired muscles are deep (1. ) of the back (figure 6.18b). each erector spinae is a composite muscle consisting of three muscle columns (longissimus, iliocostalis, and spinalis) that collectively span the entire length of the vertebral column. these muscles not only act as powerful back extensors (\erectors\) but also provide (2. ) that helps control the action of bending over at the waist. following injury to back structures, these muscles go into spasms, a common source of lower back pain.
quadratus lumborum
the fleshy quadratus lumborum (qwad - ratus lum - borum) muscles form part of the posterior (3. ) wall. acting separately, each muscle of the pair flexes the spine laterally. acting together, they extend the lumbar spine. these muscles arise from the iliac crests and insert into the upper lumbar vertebrae (figure 6.18b).
deltoid
the deltoids are fleshy, triangle - shaped muscles that form the rounded shape of your shoulders. because they are so bulky, they are a favorite (4. ) site (figure 6.19) when relatively small amounts of medication (less than 5 ml) must be given intramuscularly (into muscle). the origin of each deltoid winds across the shoulder girdle from the spine of the scapula to the clavicle. it inserts into the proximal humerus. the deltoids are the (5. ) movers of arm abduction.

o 1. abdominal 2. injection 3. prime 4. muscles 5. resistance
o 1. prime 2. muscles 3. resistance 4. abdominal 5. injection
o 1. muscles 2. resistance 3. abdominal 4. injection 5. prime
o 1. resistance 2. abdominal 3. injection 4. prime 5. muscles
o 1. injection 2. prime 3. muscles 4. resistance 5. abdominal

Accepted Answer

# Brief Explanations:
The erector spinae are deep muscles of the back. They provide resistance for bending over. The quadratus lumborum form part of the posterior abdominal wall. The deltoid is a favorite injection site and is the prime mover of arm abduction.
# Answer:
1. muscles 2. resistance 3. abdominal 4. injection 5. prime

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