90 - Anterior Abdominal Wall Flashcards
Layers encountered if cutting into anterior abdominal wall 1 2 3 4 5 6 7
1) Skin 2) Superficial fascia (fatty layer) 3) Superficial fascia (membranous layer) 4) External oblique muscle 5) Internal oblique muscle 6) Transversus abdominus 7) Extraperitoneal fascia
Tissue layout of obliques and transversalis abdominis
Fleshy laterally, aponeurotic medially
Muscle with a free inferior edge
External oblique
Inguinal ligament
Free inferior edge of the external oblique. Is thickened, curls inwards.
Attachments of inguinal ligament
Lateral border attaches to iliac crest. Attachment at anterior superior iliac spine, public tubercule, with a free edge between.
Attachments of the internal oblique
1) Attaches to costal margin superiorly 2) Attaches to lateral 2/3 inguinal ligament, anterior iliac crest laterally. 3) Upper fibres join at linea alba. 4) Lower fibres arch upwards, over, downwards, join public crest.
Attachments of the internal oblique 1 2 3 4
1) Attaches to costal margin superiorly 2) Attaches to lateral 2/3 inguinal ligament, anterior iliac crest laterally. 3) Upper fibres join at linea alba. 4) Lower fibres arch upwards, over, downwards, join public crest.
Where on the posterior abdominal wall do the obliques and transversalis abdominis join?
Thoracolumbar fascia
Where do the lowermost fibres of the internal obliques arise from?
Lateral 1/3 of inguinal ligament
Muscles sharing a conjoined tendon inserting into the pubic crest
Internal and external oblique
*Configuration of rectus abdominis sheath above umbilicus
*Configuration of rectus abdominis sheath below umbilicus
Where does rectus abdominis arise from?
Pubic crest
What does rectus abdominis attach to?
Costal cartilages 5, 6, 7
What creates the ‘six pack’ shape?
Tendinous disruptions to vertical ascent of muscle fibres (3x).
What forms the rectus abdominis sheath?
Aponeuroses from three muscles (internal, external obliques, transversus abdominis)
Muscle whose aponeurosis encloses rectus abdominis from both anterior and posterior
Internal oblique
Level at which all aponeuroses of internal, external obliques and transversus abdominis travel superficial to rectus abdominis?
Inferior to umbilicus
Name for where the posterior rectus abdominis sheath ends
Arcurate line
Where does the abdominal neurovascular plane lie?
Between the internal obliques and transverse abdominis
Main arterial supplies of anterior abdominal wall 1 2
1) Superior epigastric artery (branches from internal thoracic) 2) Inferior epigastric artery (branches from external iliac artery)
Venous drainage of anterior abdominal wall
Dual drainage. Portal and systemic drainage.