Anatomy Flashcards
Epigastric
Upper middle ninth
Hypochondrium
Left and right upper ninths
Umbilical
Middle ninth
Flank
Left and right middle ninths
Pubic
Lower middle ninth
Groin
Left and right lower ninths
9 layers of abdominal wall from skin to abdominal cavity
Skin Campers fascia Scarpas fascia External oblique muscle Internal oblique muscle Transversus abdominis Transversalis fascia Extraperitoneal fascia Parietal peritoneum
Superior boundary of abdomen
Diaphragm and inferior thoracic aperture
Inferior boundary of abdomen
Iliac crest, inguinal ligament and pelvic inlet
Posterior boundary of abdomen
Lumbar vertebral column, psoas major, quadratum lumborum
Lateral and anterior boundary of abdomen
Abdominal wall muscles
Above the bellybutton, the fascia present is:
Campers fascia only
Below the bellybutton, the fascia present is:
Campers and Scarpas fascia
Campers fascia
Thick, fatty superficial layer of the anterior abdominal wall
Scarpas fascia
Deep membranous layer of fascia
Deep to Campers fascia, superficial to external oblique muscle
Rectus abdominis origin
Pubic tubercle, crest and symphysis
Rectus abdominis insertion
Costal cartilage of ribs 5 - 7 and xiphoid process
Rectus abdominis actions
Flexes trunk
Supports and compresses abdominal wall
Rectus abdominis innervation
Anterior rami of thoracic spinal nerves
Rectus abdominis fibre direction
Directly down
External oblique origin
Ribs 5 - 12
External oblique insertion
Iliac crest and linea alba
Aponeurosis of external oblique muscle
From xiphoid process of sternum to pubic symphysis. Lower border forms inguinal ligament.
External oblique actions
Flexes trunk
Turns to opposite side
Bends to same side
External oblique innervation
Anterior rami of thoracic spinal nerves
External oblique fibre direction
Infero-medial
Linea alba
Fibrous structure that runs down the midline of the abdomen in humans and other vertebrates
Internal oblique origin
Thoracolumbar fascia, inguinal ligament and iliac crest
Internal oblique insertion
Ribs 9 - 12, linea alba and pubis
Internal oblique actions
Flexes trunk
Bends and turns trunk to the same side
Internal oblique innnervation
Anterior rami of thoracic spinal nerves
Some L1
Internal oblique fibre direction
Supero-medial
Transversus abdominis origin
Thoracolumbar fascia, iliac crest, inguinal ligament and costal cartilage of ribs 7 - 12
Transversus abdominis insertion
Linea alba, pubic crest and pectineal line
Transversus abdominis actions
Supports abdominal wall
Transversus abdominis innervation
Anterior rami of thoracic spinal nerves
Some L1
Transversus abdominis fibre direction
Transverse
Below the arcuate line there is no:
Posterior rectus sheath behind rectus abdominis
Instead covered posteriorly by transversalis fascia and parietal peritoneum
The superior epigastric artery comes from:
The internal thoracic artery
The inferior epigastric artery comes from:
The external iliac artery
Position of superior and inferior epigastric arteries
Deep longitudinally to rectus abdominis, on top of transversalis fascia and within the rectus sheath
Eventually form an anastamosis
The thoracoepigastric veins drain into:
The axillary vein
The superficial epigastric veins drain into:
The femoral vein
The axillary vein drains:
The superior abdomen
The femoral vein drains:
The inferior abdomen
Abdominal nerve position
Travel in neurovascular plane between internal oblique and transversus abdominis muscles
Skin, muscles and parietal peritoneum innervation
T7 - T12 intercostal and L1 iliohypogastric spinal nerves
Important landmark of the T10 dermatome
Umbilicus
Important landmark of the T4 dermatome
Nipple
In general, the superior lymphatics follow:
Veins
In general, the inferior lymphatics follow:
Arteries
Visceral peritoneum covers:
Organs (abdominal viscera)
Parietal peritoneum:
Lines the body wall
Between the two peritoneum layers you can find:
A small amount of serous fluid to prevent friction during movement
Mesentery is formed by:
The visceral peritoneum folding back in on itself, forming an anchor to the posterior body wall
Function of mesentery
Anchorage
Passage of blood vessels and nerves in and out
Parietal peritoneum sensation
Sensitive to pain, touch, temperature and pressure
Thoracic and lumbar somatic nerves supply body wall
Phrenic nerve supplies near diaphragm
Obturator nerve supplies near pelvis
Visceral and mesentery sensation
Sensitive to stretch by autonomic nervous system
GI tract is suspended by:
Multiple mesenteries
Midgut and hindgut is suspended by:
Dorsal mesentery only
Foregut is suspended by:
Both ventral and dorsal mesenteries
Greater sac
Peritoneal cavity proper
Lesser sac
Behind lesser omentum and stomach
Formed by rotation of foregut structures which drags the lesser omentum round to create a pocket
The opening to the lesser sac is called:
The foramen of Winslow