Anterior Abdominal Wall

External oblique muscle origin

Fleshy digitations from lower 8 ribs

External oblique muscle insertion

A. Fleshy fibers: outer lip of anterior 1/2 of iliac crest
B. Aponeurosis:


1. Medial part: linea alba from xiphoid process to symphysis pubis
2. Lateral part: folded upwards and backwards upon itself to form inguinal ligament (ASIS to pubic tubercle)

External oblique muscle direction of fibers

Downwards \n Forwards \n Medially

External oblique muscle innervation

intercostal nerves (T7-T11) and subcostal nerve (T12)

Internal oblique muscle origin

Anterior 2/3 of intermediate line of the iliac crest

Lateral 2/3 of the inguinal ligament

Lumbar fascia

Internal oblique muscle insertion

Lower 6 costal cartilages

Linea alba

Pubic crest and pectineal line via the conjoint tendon

Internal oblique muscle direction of fibers

Upwards

Forwards

Medially

Internal oblique muscle innervation

T7- T12

iliohypogastric nerve

ilioinguinal nerve

Transversus abdominis muscle origin

Lower 6 costal cartilages

Lumbar fascia

Anterior 2/3 of inner lip of iliac crest

Lateral 1/3 of inguinal ligament

Transversus abdominis muscle insertion

linea alba

pubic crest and pectineal line via the conjoint tendon

Transversus abdominis muscle direction of fibers

Horizontally

Transversus abdominis muscle innervation

T7 -T12

Iliohypogastric nerve

Ilioinguinal nerve (L1)

Recuts abdominis muscle origin

Pubic crest

Pubic symphysis

Recuts abdominis muscle insertion

7th, 6th, 5th costal cartilages

Xiphoid process

Recuts abdominis muscle innervation

Intercostal nerves (T7 - T11)

Subcostal nerve (T12)

Pyramidalis muscle innervation

T12

Pyramidalis muscle origin

front of pubis and pubic symphysis

Pyramidalis insertion

linea alba 4cm above its origin

Inguinal Canal roof

arched fibers of the internal oblique and transversus abdominis

Structures passing through the inguinal canal

* ilioinguinal nerve
* spermatic cord in males
* round ligament of the uterus in females

Posterior wall of the inguinal canal

fascia transversalis

conjoint tendon (medial half) and reflected part of the inguinal ligament

Anterior wall of the inguinal canal

external abdominal oblique aponeurosis

lateral third: internal abdominal oblique

Floor of the inguinal canal

concave upper surface of the inguinal ligament and lacunar ligament

Superficial Inguinal Ring origin:

aponeurosis of external oblique

Deep Inguinal Ring origin:

fascia transversalis

Content of the Rectus Sheath

* Rectus abdominis muscle
* pyramidalis muscle
* superior epigastric vessel
* inferior epigastric vessel
* terminal parts of T7-T11 nerves
* terminal parts of T12 nerve

linea alba

a strong fibrous structure which is firmly attached to the __xiphoid process__ above and the __symphysis pubis__ below