"origin: transverse processes of lower six cervical vertebrae (C2-C7)"
"origin: transverse processes of lower six cervical vertebrae (C2-C7)"
"insertion: upper surface of first rib"
"insertion: upper surface of first rib"
"insertion: upper surface of first rib"
"action (similar to scalenus anterior muscle)"
"action (similar to scalenus anterior muscle)"
"nerve supply: ventral rami of cervical nerves C3-C8 from the cervical plexus"
"nerve supply: ventral rami of cervical nerves C3-C8 from the cervical plexus"
"origin: transverse processes of lower six cervical vertebrae (C2-C7)"
"nerve supply: ventral rami of cervical nerves C3-C8 from the cervical plexus"
"roots of brachial plexus (C6, C7 and C8)"