<Table> <Tr> <Th_colspan="2"> Brachialis </Th> </Tr> <Tr> <Td_colspan="2"> Deep muscles of the chest and front of the arm, with the boundaries of the axilla . (Brachialis visible at bottom right .) </Td> </Tr> <Tr> <Td_colspan="2"> Position of brachialis (shown in red). </Td> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> Origin </Th> <Td> anterior surface of the humerus, particularly the distal half of this bone </Td> </Tr> <Tr> <Th> Insertion </Th> <Td> coronoid process and the tuberosity of the ulna </Td> </Tr> <Tr> <Th> Artery </Th> <Td> radial recurrent artery, brachial artery </Td> </Tr> <Tr> <Th> Nerve </Th> <Td> musculocutaneous nerve (C5 - C7) and radial nerve (C5, C6) </Td> </Tr> <Tr> <Th> Actions </Th> <Td> flexion at elbow joint </Td> </Tr> <Tr> <Th_colspan="2"> Identifiers </Th> </Tr> <Tr> <Th> Latin </Th> <Td> musculus brachialis </Td> </Tr> <Tr> <Th> TA </Th> <Td> A04. 6.02. 018 </Td> </Tr> <Tr> <Th> FMA </Th> <Td> 37667 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of muscle (edit on Wikidata) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Brachialis </Th> </Tr>

What is the action of the brachialis muscle