A1: Abdominal muscles

ANA124

What is A?

rectus abdominis

What is B?

internal oblique

What is C?

transversus abdominis 

What is A?

external oblique 

What is B?

aponeurosis of external oblique

What is A?

aponeurosis of internal oblique

What is B?

internal oblique

What is A?

transversus abdominis

What is B?

aponeurosis of transversus abdominis

What is A

linea semilunaris

What is B

tendinous intersections

What is C

rectus abdominis

What is D?

linea alba

location of linea alba

vertical line formed by right and left sheath meeting in the middle

location of linea semilunaris

the most lateral edge of rectus sheath/abdominis

external oblique origin

lower 8 ribs

insertion of external oblique

iliac crest and linea alba

unilateral action of external oblique

rotation and side flexion

bilateral action

flexion of lumbar spine

innervation of external oblique

thoracic spinal nerves

internal oblique origin

lumbodorsal fascia, iliac crest, lingual ligament

insertion of internal oblique

costal cartilages of last 3 ribs, linea alba

unilateral action of internal oblique

rotation and side flexion

bilateral action

flexion of lumbar spine

innervation of internal oblique

thoracic spinal nerves

transversus abdominis origin

lower 6 CC, lumbodorsal fascia, iliac crest, inguinal ligament

insertion of transversus abdominis

linea alba

transversus abdominis actions

increase abdominal pressure, support back

innervation of transversus abdominis

thoracic spinal nerves

rectus abdominis origin

pubic crest

insertion rectus abdominis

costal cartilages 5-7 and xiphoid process

rectus abdominis actions

flexion of lumbar spine and compress abdominal contents

function of tendinous interactions

allows you to do more refined flexion ie. belly dancing

3 layers of rectus abdominis muscle

external oblique, internal oblique 1/2, transversus abdominis muscle

location of lingual ligament

attached btw public tubercle and anterior superior iliac spine

lingual canal function

passage way for spermatic cord/round ligaments of uterus to pass through.

deep ring

deficit in the transversalis fascia

superficial ring

opening in the fibers of external oblique muscle

peritoneum

lining of abdominal wall

greater omentum

double layer of visceral (covers organs)

lesser omentum

peritoneum from stomach to transverse colon

mesentery:

double layer from stomach to liver