A 7-year-old child can neither abduct the shoulder nor raise it horizontal ly . The child can raise the hand to the face only dorsal ly with the help of shoulder abduction ( using supraspinous muscle) . This condition can be described as "bugler ’s arm". Which muscle has its a ctive function absent?

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A 7-year-old child can neither

abduct the shoulder

nor

raise it horizontally. The child can raise the hand to the face only dorsally

with

the help

shoulder abduction (using supraspinous muscle). This condition can be described as "bugler’s arm". Which muscle has its active function absent?

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