Thoracic nerves/ Blood supply Flashcards
Where does the lateral cutaneous branch of the intercostal nerve branch off
Near mid axillary line
What are the atypical intercostal nerves
1, 2, 7-11, 12
Why is 1st intercostal nerve atypical
No ant or lat cutaneous branch (no dermatome)
does not course thru the groove of rib 1
why is the 2nd intercostal nerve atypical
- second rib also doesnt have a costal groove
- lat cutaneous branch is long and called first intercostobrachial nerve
Typical intercostal nerves + where do they travel thru
3-6
- each course btw the internal and innermost intercostal along the costal groove
intercostal nerves 7-11;
course
when do they change name
intercostal- course bw the internal and innermost m along costal groove
Thoracoabdominal- beyond costal margin they are called this
-travel bw internal oblique and transversus abdominis
What does subcostal groove innervate for skin
skin sup to iliac crest and sup to pubic symphisis
What is the artery called within the intercostal space
Post intercostal arteries + ant intercostal arteries
what supplies ant intercostal arteries
internal throacic artery
After costal cartilage 7 what does the internal thoracic split into
sup epigastric artery
musculophrenic artery
What do the post intercostal arteries arise from
first 2- costal cervical trunk
rest- thoracic aorta
post intercostal veins drain into (right and left)
right- azygos vein
left- hemiazygos + accessory hemiazygos
Both drain into azygos system
Smaller intercostal veins drain into
internal thoracic
then brachiocephalic
what are anastomotic veins do and where do they carry bood
- thoracoepigastric vein
- -connection between cutaneous brnaches and femoral vein
-Blood from the lower limb and blood from the skin of the toracoabdominal wall will drain directly into the axillary vein
