Exam 3 - Thoracic Nerves

what do the posterior primary rami of thoracic spinal nerves divide into

medial and lateral branch

all 12 thoracic nerves have a medial branch that has sensory supply to skin _____

paraspinally

T1-t6 medial branches supply what muscles

semispinalis and multifidi

T7-T12 medial branches supply what muscles

longissimus and multifidi

t/f

lateral branches increase in size as you move inferior

true

all 12 thoracic nerves have a lateral branch that supplies sensory to the skin near what structure? what muscles receive motor supply from the lateral braches?

costal angles

longissimus, iliocostalis, levator costarum

anterior primary rami of the thoracic spinal nerves generally follow the course of the rib above or below? What are the 2 exceptions to this?

above

t1 contribute to brachial plexus

t2 contribute to intercostobrachial nerve

each intercostal nerve gives off a branch named what? what does it supply

lateral cutaneous branch -overlying skin

after the lateral cutaneous branch is given off, what does the intercostal nerve terminate as? what do they supply?

anterior cutaneous branches - skin close to midline

the intercostal nerves give off muscular branches that supply muscles which attach to ribs, what are the names of these muscles?

internal and external intercostals, serratus posterior, transversus thoracis, subcostalis, innermost intercostal

anterior primary rami 7-11 intercostal nerves supply muscular branches to which muscles

transverse abdominal, internal and external abdominal oblique, rectus abdominus

what are some other structures that intercostal nerves supply

blood vessels, bones, joint, ligaments

what is the name of the anterior primary ramus of T12

subcostal nerve

what is the largest thoracic nerve

subcostal nerve

what plexus does the subcostal nerve contribute to

lumbar

the subcostal nerve supplies skin as far down as what

superior buttocks

what levels contain preganglionic sympathetics? what ramus is present here?

T1-L2/3

white

are gray ramus communicans or white ramus communicans more medial

gray