cord segment T6.
COURSE/DISTRIBUTION: This nerve takes origin from spinal cord segment T6
and leaves the vertebral canal by passing through the intervertebral
foramen between T6 and T7 vertebrae. It immediately divides into two
rami- dorsal and ventral rami.
turns backwards, close to T6 costotransverse joint and divides into
medial and lateral branches.
branch immediately passes between the joint and the superior
costotransverse ligament with the corresponding intertransversarii. It
runs between the semispinalis thoracis and multifidus. After supplying
these muscles, it enters the rhomboideus major, minor and the
trapezius. Its cutaneous branches now enter the skin at the side of T6
vertebra to supply the medial part of posterior aspect of T6
branch runs laterally and occupies the interval between the superior
costotransverse ligament and the intertranversarii. It then turns on
the medial aspect of the T6 levator costae. It runs between the
longissimus thoracis and iliocostalis thoracis. Its muscular branches
supply these muscles, including the latissimus dorsi. It then pierces
the skin of the remaining lateral part of the T6 dermatome to supply
it with cutaneous branches.
Continues as the sixth intercostal nerve, which runs in the costal
groove of the 6th rib under the 6th posterior
intercostal artery. The 6th superior anterior intercostal
artery later replaces this artery in the same groove.
Continues as 6th intercostal nerve.
ROOT VALUE: T6
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Creator: Oluwole Ogunranti