<Table> <Tr> <Td> Name </Td> <Td> Attachment </Td> <Td> Function </Td> </Tr> <Tr> <Td> serratus anterior </Td> <Td> Originates on the surface of the upper eight ribs at the side of the chest and inserts along the entire anterior length of the medial border of the scapula . </Td> <Td> It fixes the scapula into the thoracic wall and aids in rotation and abduction of the shoulders . </Td> </Tr> <Tr> <Td> subclavius </Td> <Td> Located beneath the clavicle, originating from the first rib and inserting on the subclavian groove of the clavicle . </Td> <Td> It depresses the lateral clavicle and also acts to stabilize the clavicle . </Td> </Tr> <Tr> <Td> pectoralis minor </Td> <Td> Arises from the third, fourth, and fifth ribs, near their cartilage and inserts into the medial border and upper surface of the coracoid process of the scapula . </Td> <Td> This muscle aids in respiration, medially rotates the scapula, protracts the scapula, and also draws the scapula inferiorly . </Td> </Tr> <Tr> <Td> sternocleidomastoid </Td> <Td> Attaches to the sternum (sterno -), the clavicle (cleido -), and the mastoid process of the temporal bone of the skull . </Td> <Td> Most of its actions flex and rotate the head . In regards to the shoulder, however, it also aids in respiration by elevating the sternoclavicular joint when the head is fixed . </Td> </Tr> <Tr> <Td> levator scapulae </Td> <Td> Arises from the transverse processes of the first four cervical vertebrae and inserts into the medial border of the scapula . </Td> <Td> It is capable of rotating the scapula downward and elevating the scapula . </Td> </Tr> </Table> <Tr> <Td> Name </Td> <Td> Attachment </Td> <Td> Function </Td> </Tr> <Tr> <Td> serratus anterior </Td> <Td> Originates on the surface of the upper eight ribs at the side of the chest and inserts along the entire anterior length of the medial border of the scapula . </Td> <Td> It fixes the scapula into the thoracic wall and aids in rotation and abduction of the shoulders . </Td> </Tr> <Tr> <Td> subclavius </Td> <Td> Located beneath the clavicle, originating from the first rib and inserting on the subclavian groove of the clavicle . </Td> <Td> It depresses the lateral clavicle and also acts to stabilize the clavicle . </Td> </Tr>

What 2 bones make up the lower arm