Which option accurately describes the origin and insertion of the anterior and middle scalene muscles?
a) Anterior scalene: Originates from the transverse processes of C3-C6 vertebrae, inserts into the first rib. Middle scalene: Originates from the transverse processes of C2-C7 vertebrae, inserts into the first rib.
b) Anterior scalene: Originates from the first rib, inserts into the clavicle. Middle scalene: Originates from the second rib, inserts into the sternum.
c) Anterior scalene: Originates from the transverse processes of C1-C3 vertebrae, inserts into the clavicle. Middle scalene: Originates from the transverse processes of C4-C6 vertebrae, inserts into the first rib.
d) Anterior scalene: Originates from the spinous processes of T1-T3 vertebrae, inserts into the first rib. Middle scalene: Originates from the spinous processes of T4-T6 vertebrae, inserts into the second rib.