T6 NERVE

 

ORIGIN: Spinal 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.

Dorsal ramus

It immediately turns backwards, close to T6 costotransverse joint and divides into medial and lateral branches.

bullet The medial 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 dermatome.
bullet The lateral 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.

Ventral ramus:

bullet 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.

BRANCHES.

bullet Cutaneous branches
bullet Muscular branches
bullet Dorsal ramus
bullet Ventral ramus

1.    Continues as 6th intercostal nerve. 

ROOT VALUE: T6

 

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