Thoracic and lumbar nerves Flashcards
How many thoracic nerves are there?
12 pairs
What does each thoraces nerve divide into?
anterior and posterior primary rami
which rami of the thoracic spinal nerve divides into medial and lateral branches?
posterior primary ramus
What muscles do the medial branches of the posterior primary rams in the thoracics supply?
semispinalis(upper 6),
longissimus (lower 6)
multifidi
what muscles do the lateral branches supply?
longissimus
iliocostalis
levator costarum
What do the lateral branches of the posterior primary ramus of the thoracics supply? (Sensory)
sensory to the skin near the costal angles
What do the medial branches of the posterior primary rams of the thoracics supply?
sensory to the skin paraspinally
Which thoracic spinal nerve contributes to the brachial plexus?
anterior primary ramus of T1
What direction does the posterior primary ramus project?
posteriorward
What is the course of the anterior primary ramus?
it follows the rib above the nerve
Which two thoracic nerves sometimes contribute to the intercostobrachial nerve?
the anterior primary rami of T1 and T2
each intercostal nerve gives off what specific branch that divides further into anterior and posterior branches?
lateral cutaneous branch
What does the lateral cutaneous branch supply?
sensory to the overlying skin
In which branch does the intercostal nerves terminate?
anterior cutaneous branch
What do the anterior cutaneous branches supply?
sensory to the skin close to the midline
What muscles do the intercostal nerves supply?
internal intercostals external intercostals serratus posterior transverse thoracics transverse abdomen internal abdominal oblique external abdominal oblique rectus abdominus
Which muscles are innervated by the intercostal nerves of T7-T11?
transverse abdomin
internal abdominal oblique
external abdominal oblique
rectus abdominus
The intercostal nerves also supply which structures?
the adjacent blood vessels, bones, joints, and ligaments
which thoracic nerve contributes to the lumbar plexus?
subcostal nerve T12
What’s the longest thoracic nerve?
subcostal nerve T12
What does subcostal nerve T12 supply?
skin as far inferior as the superior buttocks
how do the thoracic nerves communicate with the sympathetic trunk?
both white and gray ramus communicans
The _________ ramus is medial to the ________ ramus.
Gray; White
How many pairs of lumbar nerves are there?
5 pairs
