A- nilaterally:Laterally flex the head and neck to the same sideRotate the head and neck to the opposite sideBilaterally:Flex the neckAssist to elevate the rib cage during inhalationO- Sternal head: Top of manubriumClavicular head: Medial one-third of the claviclei- Mastoid process of temporal bone and the lateral portion of superiornuchal line of occiput