thoracic nerve Flashcards
what will each nerve divide into?
posterior and anterior primary ramus
how many pairs of thoracic nerve roots are there?
12
what does the posterior primary ramus divide into?
medial and lateral branch
what are the muscles supplied by the medial branch?
semispinalis(upper six), longissimus (lower six), multifidi
what is the sensory area supplied by the medial branch of the posterior ramus?
skin paraspinally
do the lateral branches of the thoracic spinal nerves carry motor or sensory information
both motor and sensory
how to the lateral branches of the thoracic spinal nerves increase in size
from superior to inferior
what muscles are supplied by the lateral branches of the thoracic spinal nerves
longissimus, iliocostalis, and levator costorum
where does the lateral branches of the thoracic spinal nerves supply sensory information to?
skin near the costal angles
the anterior primary rami of the thoracic spinal nerves follow what course in relation to ribs
they follow the course of the rib above the nerve
aside from contributing to the brachial plexus what other branch does the T1 anterior primary ramus give off?
a smaller branch that forms the first intercostal nerve
what anterior primary rami contribute to the intercostobrachial nerve
T2 and T1(sometimes)
each intercostal nerves gives off which branch
lateral cutaneous branch
what does the lateral cutaneous branch of the anterior primary rami divide into? and what do they supply?
anterior branch and posterior branch, supplying the overlying skin
where do intercostal nerves terminate and what do they supply
in the anterior cutaneous branches , that supply the skin close to midline
what muscles do the intercostal nerves give off muscular branches to supply?
internal intercostals, external intercostals, serratus posterior, transversus thoracis, transverse abdominal (7-11) internal abdominal oblique (7-11), external abdominal oblique(7-11), rectus abdominus(7-11)
aside from muscles what else will the intercostal nerves supply
adjacent blood vessels, bones, joints, and ligaments
what is the largest thoracic nerve
subcostal nerve (T12)
what plexus does the subcostal nerve contribute to
lumbar plexus
how far does the subcostal nerve supply the skin
as far inferior as the superior buttocks
how does each thoracic nerve communicate with the sympathetic trunk
both white and gray ramus communicans
where is the gray ramus located in relation to the white ramus
medial
