unit 4 muscles origins, insertion, actions, + facial bones

what is the origin of the rectus abdominis

pubis

what is the insertion of the rectus abdominis

xiphoid and middle ribs

what is the action of the rectus abdominis

trunk flexion and posterior tilting of pelvis

what is the origin of the external abdominal oblique

last 8 ribs

what is the insertion of the external abdominal oblique

iliac crest and linea alba

what is the action of the external abdominal oblique

bilateral = trunk flexion and posterior tilt of pelvis
unilateral = lateral flexion the same side and rotation to opposite side

what is the origin of the internal abdominal oblique

iliac crest and inguinal ligament

what is the insertion of the internal abdominal oblique

linea alba and last 3 ribs

what is the action of the internal abdominal oblique

bilateral = trunk flexion and posterior tilt of pelvis
unilateral = lateral flexion to same side and rotation to sane side

what is the origin of the transverse abdominis

lower ribs, lumbar fascia, iliac crest, and inguinal ligament

what is the insertion of the transverse abdominis

linea alba

what is the action of the transverse abdominis

compresses abdominal wall

what is the origin of the quadratus lumborum

posterior iliac crest

what is the insertion of the quadratus lumborum

lumbar transverse processes and 12th rib

what is the action of the quadratus lumborum

trunk lateral flexion and hip hiking

what is the origin of the latissimus dorsi

T6 spinous processes to sacrum and ilium

what is the insertion of the latissimus dorsi

bicipital groove

what is the action of the latissimus dorsi

bilateral = trunk extension and anterior pelvic tilting
unilateral = hip hiking, lateral flexion to the same side

what is the origin of the multifidus and rotatores

transverse processes

what is the insertion of the multifidus and rotatores

spinous processes and lamina of vertebra above

what is the action of the multifidus and rotatores

rotation of neck and trunk

what is the origin of the sternocleidomastoid

clavicle and manubrium

what is the insertion of the sternocleidomastoid

mastoid process

what is the action of the sternocleidomastoid

bilateral = cervical flexion, capital extension
unilateral = lateral flexion to the same side, rotation to the opposite side

what is the origin of the scalenes

transverse processes cervical vertebra

what is the insertion of the scalenes

1st and 2nd ribs

what is the action of the scalenes

neck flexion, lateral flexion to the same side, elevate ribs for inspiration

what is the origin of the levator scapulae

transverse processes of upper C-spine

what is the insertion of the levator scapulae

vertebral border of scapula near superior angle

what is the action of the levator scapulae

bilateral = neck extension

unilateral = neck lateral flexion to same side, rotation to same side

what is the origin of the upper trapezius

base of skull through spinous processes through T12

what is the insertion of the upper trapezius

clavicle, acromion, spine of scapula

what is the action of the upper trapezius

bilateral = neck extension

unilateral = lateral flexion to same side, rotation to opposite side