Exam 3: Anterior Abdominal Wall Flashcards
Midclavicular plane
Vertical planes extend inferiorly from midpoints of clavicle to midpoint between ASIS and pubic symphysis
Subcostal plane
Horizontal plane joining lowest point of costal margin on each side — L3 level
Transtubercular Plane
Horizontal plane that joins tubercles of iliac crests — L5 level
Midclavicular planes, subcostal plane and transtubercular plane together divide abdomen into
9 regions
Liver lies mostly in what regions
Right hypochondrium and epigastric
Spleen and fundus and body of stomach are found in what region
Left hypochondrium
Quadrant system uses what planes
Median plane (vertical) Transumbilical plane (horizontal)
Umbilicus is a _____ landmark which lies between ____
Variable; L2-5
2 layers of superficial fascia
Superficial layer (Camper’s) Deep layer (Scarpa’s)
Superficial (Camper’s) Fascia
Thin fatty layer, continuous w/ superficial fascia of perineum and thigh
Deep Layer (Scarpa’s) Fascia
Membranous layer, firmly fastened to fascia lata of the thigh
Thin layer of superficial fascia covers
Each anterior abdominal wall muscles
Linea alba is a median tendinous raphe that runs from
Xiphoid process to pubic symphysis
Anterolateral muscles
External oblique
Internal oblique
Transversus abdominis
External oblique muscle fibers run
Downward and forward
Internal oblique muscle fibers run
Downward and backward
Transversus abdominis muscle fibers run
Horizontally
External oblique innervation
Anterior primary rami of lower 6 T nerves
Internal oblique innervation
Anterior primary rami of lower 6 T and L1 nerves
Transversus abdominis innervation
Anterior primary rami of lower 6 T and L1 nerves
Anterior muscles of the abdomen
Rectus abdominis
Pyramidalis
Rectus abdominis innervation
Anterior primary rami of lower 6 T nerves
Linea semilunaris
Curved line along lateral border of rectus abdominis
Tendinous intersections
Bundles of CT that run transversely across rectus abdominis
Fuse w/ rectus sheath
Pyramidalis muscle
Small and often absent
Slip of muscle anterior to rectus abdominis
Pyramidalis muscle innervation
Subcostal nerve
Low back pain is often related to
Weak abdominal muscles
Rectus sheath is like an
Envelope
Rectus sheath encloses
- Rectus abdominis
- Pyramidalis
- Superior epigastric A and V
- Inferior epigastric A and V
- Anterior primary rami of lower 6 T nerves
What is the Arcuate line
Crescent shaped line in posterior layer of rectus sheath
Location of arcuate line
Midway between umbilicus and pubic crest
Anterior layer of rectus sheath ABOVE arcuate line
Aponeuroses of external and internal oblique muscles
Posterior layer of rectus sheath ABOVE arcuate line
Aponeuroses of internal oblique and transversus abdominis
Above arcuate line aponeurosis of _____ splits to enclose ______
Internal oblique; rectus abdominis
Anterior layer of rectus sheath BELOW arcuate line
Aponeuroses of external and internal oblique and transversus abdominis
Posterior layer of rectus sheath BELOW arcuate line
Transversalis fascia
5 folds of anterior abdominal wall
Median
Medial (x2)
Lateral (x2)
Median umbilical fold extends from
Apex of bladder to umbilicus
Median umbilical fold contains
Urachus
Medial umbilical fold extends from
Side of bladder to umbilicus
Medial umbilical fold contains
Obliterated umbilical artery
Lateral umbilical fold extends from
Deep inguinal ring to arcuate line
Lateral umbilical fold contains
Inferior epigastric vessels
Folds form boundaries between
3 paired fossa:
- Supravesical
- Medial inguinal
- Lateral inguinal
Supravesical fossa between
Median and medial umbilical folds
Medial inguinal fossa between
Medial and lateral umbilical folds
Lateral inguinal fossa location
Lateral to lateral umbilical fold
Ligamentum teres location
Above umbilicus
Ligamentum teres contains
Obliteraled umbilical veins
Ligamentum teres forms free edge of
Falciform ligament
Superior epigastric artery is from
Internal thoracic artery
Inferior epigastric artery is from
External iliac artery
Lumbar arteries are from
Abdominal aorta
Deep circumflex iliac artery is from
External iliac artery
Lower 6 T nerves run between
Internal oblique and transversus abdominis