Anterior Abdominal wall Flashcards
What is the origin of the pyramidalis muscle?
Pubic symphysis and pubic crest
Where does the pyramidalis muscle insert?
Linea alba
Which arteries supply the pyramidalis muscle?
Inferior and superior epigastric arteries
What nerve innervates the pyramidalis muscle?
Subcostal nerve (T12)
What is the primary action of the pyramidalis muscle?
Tensing the linea alba
What is the shape and location of the pyramidalis muscle?
A small triangular muscle, anterior to the rectus abdominis muscle
What is the origin of the rectus abdominis muscle?
Crest of pubic
Where does the rectus abdominis muscle insert?
Costal cartilages of ribs 5-7 and xiphoid process of sternum
Which artery supplies the rectus abdominis muscle?
Inferior epigastric artery
What nerves innervate the rectus abdominis muscle?
Thoracoabdominal nerves (T7 to T11) and subcostal nerve (T12)
What is the primary action of the rectus abdominis muscle?
Flexion of the lumbar spine
What is the antagonist muscle of the rectus abdominis?
Erector spinae
What are the tendinous intersections?
Bands of connective tissue that interrupt the rectus abdominis into distinct muscle bellies
What is the anatomical positioning of the rectus muscles?
Paired muscles separated by the linea alba
What is the anatomical relationship of the rectus abdominis muscle?
Broad and thin superiorly, narrow and thick inferiorly
What forms the rectus sheath?
Aponeuroses of the lateral abdominal muscles
What is the origin of the external oblique muscle?
Ribs 5-12
Where does the external oblique muscle insert?
Xiphoid process, outer lip of the iliac crest, pubic crest, pubic tubercle, linea alba, inguinal ligament, anterior superior iliac spine (ASIS)
Which nerves supply the external oblique muscle?
Thoraco-abdominal nerves (T7-11) and subcostal nerve (T12)
What actions does the external oblique muscle perform?
Ipsilateral side-bending and contralateral rotation
What is the blood supply of the external oblique muscle?
Lower intercostal arteries and branches of the deep circumflex iliac artery or iliolumbar artery
What is the origin of the transversus abdominis muscle?
Iliac crest, inguinal ligament, thoracolumbar fascia, and costal cartilages 7-12
Where does the transversus abdominis muscle insert?
Xiphoid process, linea alba, pubic crest and pecten pubis via conjoint tendon
Which arteries supply the transversus abdominis muscle?
Subcostal arteries
