Thoracic Anatomy: Vessels and Nerves Flashcards
Order of neurovascular bundle in the intercostal space from superior to inferior…
Vein
Artery
Nerve
This space is on the inferior aspect of each rib, and provides partial protection to the intercostal neurovascular bundle…
costal groove
How many thoracic spinal nerves?
12 pairs
The intercostal nerves are made from the _____ rami of ___ to ____
anterior rami, T1-T11
Which nerve originates from the anterior ramus of T12 and travels on the inferior aspect of Rib 12
subcostal n.
What allows for communication between intercostal nerves and the sympathetic trunk in the spinal column
rami communicantes
Name the 4 broad branches of the intercostal nerves…
Anterior cutaneous branches
Lateral cutaneous branches
muscular branches
rami communicantes
Which intercostal nerves are “typical”
3rd-6th
Posteriorly and medially, typical intercostal nerves run between what structures?
endothoracic fascia and internal intercostal membrane
Typical intercostal nerves course between which structures after the angle of the rib?
internal and innermost intercostals
_________ branches of the neurovascular bundle run along the superior surface of the rib’s lateral course.
collateral branches
Collateral branches of intercostal nerves give rise to _______.
lateral cutaneous branches
At what anatomical point can the lateral cutaneous branches be approximated?
midaxillary line
Which ribs become the thoracoabdominal nerves?
7-11 nerves
These nerves are atypical and run along the internal surface of the ribs they are associated with
1-2
Which dermatome covers the nipple and inferior pectoralis/breast?
T4
Which dermatome covers the umbilicus?
T10
Which two arteries arise as branches from the axillary artery?
Superior thoracic artery
lateral thoracic artery
Intercostal spaces ___ thru ___ are supplied by a posterior intercostal artery, which branches from the thoracic aorta…
3-9
The posterior intercostal arteries of spaces 1 and 2 are supplied by… (3)
Subclavian a. –> costocervical trunk –> supreme intercostal a.
The anterior intercostal arteries 1 and 2 supply which 3 structures…
pectoral mm
breast
anterior skin of chest wall
The internal thoracic arteries arise from…
the subclavian artery
the internal thoracic arteries pass inferior from their origin and behind which 2 structures
clavicle and rib 1
the internal thoracic arteries pass _____ to the internal intercostal muscles
posterior
The internal thoracic arteries pass ______ to the transversus thoracis muscle.
anterior
In the 6th intercostal space, the internal thoracic arteries branch to form (2)
superior epigastric artery
musculophrenic artery
The anterior intercostal arteries of ribs 1-6 arise from…
internal thoracic artery
