709- Muscle Table (abdominals)

muscles of anterior abdominal wall (4)

rectus abdominius

external oblique

internal oblique

transverse abdominius

rectus abdominius action

trunk flexion

rectus abdominius origin

pubic crest/symphysis

rectus abdominius insertion

1. ribs 5-7

2. xiphoid process

rectus abdominius innervation

intercostal nerves (T7-11) and subcostal nerve (T12)

external oblique action

trunk flexion and rotation (fibers of internal/external oblique on opposite sides work together)

external oblique origin

ribs 5-12

external oblique insertion

1. linea alba

2. illiac crest

3. ASIS

4. pubic tubercle/crest/symphysis

external oblique innervation

intercostal nerves (T7-11) and subcostal nerve (T12)

internal oblique action

trunk flexion and rotation (fibers of internal/external oblique on opposite sides work together)

internal oblique origin

1. thoracolumbar fascia

2. illiac crest

3. inguinal ligament

internal oblique insertion

1. ribs 10-12

2. linea alba

internal oblique innervation

intercostal nerves (T7-11) and subcostal nerve (T12)

transversus abdominals action

supports abdominal viscera

transversus abdominals origin

1. ribs 7-12

2. thoracolumbar fascia

3. iliac crest/ASIS

4. inguinal ligament

transverse abdominals insertion

1. linea alba

2. pubic crest

transverse abdominals innervation

intercostal nerves (T7-11) and subcostal nerve (T12)

muscles of posterior abdominal wall (2)

psoas minor

quadratus lumborum

psoas minor action

pelvis posterior tilt

psoas minor origin

T12-L1 vertebral bodies

psoas minor insertion

iliopubic eminence

psoas minor innervation

anterior rami (L1-2)

quadratus lumborum action

extension and lateral flexion of spine

quadratus lumborum origin

1. iliac crest

2. transverse process of lower lumbar

quadratus lumborum insertion

1. transverse process of upper lumbar

2. rib 12

quadratus lumborum innervation

anterior rami (T12-L4)

muscles of pelvic diaphragm (2)

levator ani

coccygeus

levator ani (pubococcygeus, puborectalis/puboanalis, and iliococcygeus) action

supports pelvic viscera

levator ani (pubococcygeus, puborectalis/puboanalis, and iliococcygeus) origin

1. body of public

2. ischial spine

levator ani (pubococcygeus, puborectalis/puboanalis, and iliococcygeus) insertion

1. perineal body

2. coccyx

levator ani (pubococcygeus, puborectalis/puboanalis, and iliococcygeus) innervation

nerve to levator ani (S4) and inferior anal (rectal) nerve (coccygeal plexus)

coccygeus (ischiococcygeus) action

supports pelvic viscera

coccygeus (ischiococcygeus) origin

ischial spine

coccygeus (ischiococcygeus) insertion

inferior sacrum/ coccyx

coccygeus (ischiococcygeus) innervation

anterior rami (S4-5)