front 1 obliques | back 1 compression of abdomen, flexion, and rotation of trunk |
front 2 transverse abdominis | back 2 compression of abdomen |
front 3 rectus abdominis | back 3 flexion of trunk, compression of abdominal wall |
front 4 intercostals (external and internal) | back 4 elevation and depression of ribs |
front 5 diaphragm | back 5 open thoracic cavity for lungs during inspiration |
front 6 frontalis | back 6 raises eyebrows |
front 7 occipitals | back 7 pulls scalp posteriorly |
front 8 temporalis | back 8 closes jaw, retracts mandible |
front 9 masseter | back 9 closes jaw |
front 10 zygomaticus | back 10 elevates corners of mouth |
front 11 buccinator | back 11 compression of cheek |
front 12 platysma | back 12 tenses skin of neck; depression of lower lip |
front 13 orbicularis oculi | back 13 closes eyes |
front 14 orbicularis oris | back 14 closes and protrudes lips |
front 15 levator labii superioris | back 15 elevation of upper lip |
front 16 depressor labii inferioris | back 16 depression of lower lip |
front 17 sternocleidomastoid | back 17 flexion and rotation of neck |
front 18 scalenes | back 18 elevation of ribs 1&2; rotation of neck |
front 19 serratus anterior | back 19 abduction and rotation of scapula |
front 20 rhomboids | back 20 adduction and elevation of scapula |
front 21 splenius | back 21 rotation of head; extension of neck |
front 22 digastric | back 22 elevation of hyoid; opens mouth |
front 23 mylohyoid | back 23 elevation of hyoid and floor of mouth |
front 24 geniohyoid | back 24 elevation and protraction of bone |
front 25 sternohyoid | back 25 depression of hyoid and larynx |
front 26 sternothyroid | back 26 depression of hyoid and larynx |
front 27 thryrohyoid | back 27 depression of hyoid; elevation of larynx |