Thoracic nerves/ Blood supply Flashcards Preview

AN 1106 > Thoracic nerves/ Blood supply > Flashcards

Flashcards in Thoracic nerves/ Blood supply Deck (14)
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1
Q

Where does the lateral cutaneous branch of the intercostal nerve branch off

A

Near mid axillary line

2
Q

What are the atypical intercostal nerves

A

1, 2, 7-11, 12

3
Q

Why is 1st intercostal nerve atypical

A

No ant or lat cutaneous branch (no dermatome)

does not course thru the groove of rib 1

4
Q

why is the 2nd intercostal nerve atypical

A
  • second rib also doesnt have a costal groove

- lat cutaneous branch is long and called first intercostobrachial nerve

5
Q

Typical intercostal nerves + where do they travel thru

A

3-6

- each course btw the internal and innermost intercostal along the costal groove

6
Q

intercostal nerves 7-11;
course
when do they change name

A

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

7
Q

What does subcostal groove innervate for skin

A

skin sup to iliac crest and sup to pubic symphisis

8
Q

What is the artery called within the intercostal space

A

Post intercostal arteries + ant intercostal arteries

9
Q

what supplies ant intercostal arteries

A

internal throacic artery

10
Q

After costal cartilage 7 what does the internal thoracic split into

A

sup epigastric artery

musculophrenic artery

11
Q

What do the post intercostal arteries arise from

A

first 2- costal cervical trunk

rest- thoracic aorta

12
Q

post intercostal veins drain into (right and left)

A

right- azygos vein

left- hemiazygos + accessory hemiazygos

Both drain into azygos system

13
Q

Smaller intercostal veins drain into

A

internal thoracic

then brachiocephalic

14
Q

what are anastomotic veins do and where do they carry bood

A
  • 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