In their course they pierce the external oblique muscle giving off the lateral cutaneous branch
which divides into anterior and posterior branches that supply the external oblique muscle and latissmus dorsi respectively.
The average area of the nerve fascicules for the abductor digiti minimi and quadratus plantae muscles and lateral cutaneous branch
was 0,165 [mm.sup.2] (DE 0,119), 0,070 [mm.sup.2] (DE 0,042) and 0,041[m.sup.2] (DE 0,005).
INTRODUCTION: Normally the undivided lateral cutaneous branch of second intercostal nerve leaves the second intercostal space by piercing the lateral thoracic wall at midaxillary plane, passes along the base of axilla within the central group of axillary lymph nodes, reaches the upper and medial part of arm where it joins with medial cutaneous nerve of arm to form intercostobrachial nerve to supply the skin of upper and medial parts of arm.
We found the undivided lateral cutaneous branch of 2nd intercostal nerve piercing the second intercostal space at midaxillary plane, running along the base of axilla to reach the upper and medial part of arm where they join with medial cutaneous nerve of arm on each side in 29 cadavers out of 40 adult embalmed cadavers.
In 8 cadavers, the lateral cutaneous branch of 2nd intercostal nerve (1st intercostobrachial nerve) was seen originating as two branches (upper and lower) and piercing the second intercostal space anterior to midaxillary plane.
The sensory nerves branch first in the mid-axillary line sending out a lateral cutaneous branch
, and continue within the plane to perforate anteriorly supplying the skin as far as the midline.
The targets of PECS II block include the medial and lateral pectoral nerves, including the lateral cutaneous branches of the TICNs (Figure 6).
This agent can block the lateral cutaneous branches of the TICN in the interfascial plane between the pectoralis minor and serratus anterior muscles but cannot block the anterior cutaneous branch of the TICN.
The dermatomal sensory innervation to the breast is provided by the third to fifth lateral cutaneous branches
to the lateral breast region, the second to fifth anterior cutaneous nerves to the medial side and minor contribution from the intermediate group of supraclavicular nerve to the superior and lateral aspect of the breast (see Figure 9).
The lateral cutaneous branches depart near the angle of the rib posteriorly .
Since the lateral cutaneous branches leave the TAP posterior to the midaxillary line, posterior injection of local anesthetics is suggested if analgesia for both the anterior and lateral abdominal wall is required .
Versatility of lateral cutaneous branches
of intercostal vessels and nerves: Anatomical study and clinical application.