Thoracic Nerves

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NERVES THORACIC

Ventral Branches of the Thoracic Nerves

exist 12 pairs of ventral branches of the thoracic nerves, which do not constitute plexuses. Almost all 12 are located between the ribs (intercostal nerves), with the twelfth below the last rib (subcostal nerve). Intercostal nerves are distributed to the chest and abdomen walls. The communicating branches join the intercostal nerves posteriorly in the intercostal spaces.

Most fibers of the T1 ventral branch enter the brachial plexus constitution, but the rest form the first intercostal nerve. The T2 ventral branch sends an anastomotic branch to the brachial plexus, however, most of its fibers constitute the second intercostal nerve.

The last ventral branch of the thoracic nerves (T12) is called the subcostal nerve because it lies below the 12th rib.

Intercostal nerves run along the inner surface, near the inferior border of the corresponding rib, occupying the costal sulcus, parallel to and below the intercostal vein and artery.

The sensory fibers are dispersed through the lateral and anterior thorax, denominating, respectively, lateral cutaneous branch and anterior cutaneous branch.

From the 7th to the 12th thoracic branches, previously, they leave the ribs to invade the abdomen, thus innervating the muscles and cutis to a plane that mediates the navel and the pubic symphysis.

The subcostal nerve (T12) gives an anastomotic branch to the lumbar plexus, and on the other hand, some of its sensory fibers go to the gluteal region and lateral side of the thigh.

PREVIOUS ABDOMINAL WALL NERVES
 
PREVIOUS ABDOMINAL WALL NERVES
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
TYPICAL THORACIC SPIN NERVE
TYPICAL THORACIC SPIN NERVE

 

Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.