Cutaneous distributions of genitofemoral and ilioinguinal nerves to pubic, perineal and ventromedial thigh regions in Thais.

Objective: To determine the cutaneous distributions of genitofemoral (Gf) and ilioinguinal (Ig) nerves to pubic, perineal and ventromedial thigh regions in Thais. Methods: The present study was performed bilaterally in 98 halves of 49 embalmed cadavers. The cutaneous distributions of the Gf and/or Ig nerves to these regions were dissected, identified and recorded. Results: Based on the cutaneous distributions of Gf and/or Ig to pubic, perineal, and ventromedial thigh regions, five different types of cutaneous branching patterns of both nerves were identified. Type A (18.28% of cases) had only the branches of Gf to the mons pubis, anteroproximal part of the root of penis, the scrotal or labial and the ventromedial thigh regions but in type B (21.51% of cases) had only the branches of Ig to these regions. The most frequent type of these innervations was type C (39.78% of cases) with dominance of both nerves branching to these regions. In type D (8.60% of cases), having the branches of both nerves but with a dominance of Gf, consisted of 2 subtypes D-1 (2.15% of cases) and D-2 (6.45% of cases). In contrast to type D, type E (11.83% of cases) having the branches of both nerves but with a dominance of Ig, consisted of 2 subtypes E-1 (8.60% of cases) and E-2 (3.23% of cases). Conclusions: These findings would provide the marked anatomic variability of Gf and/or Ig nerves in pubic, perineal and ventromedial thigh regions in Thais, and may assist diagnosis, anesthetic nerve block and prevention nerve damage during surgery.

Anatomic variations of the superficial part of cervical plexus and its branches in Thais.

Objective: To evaluate the variations of superficial part of cervical plexus and its branches in Thais. Methods: We dissected bilaterally in 108 cervical plexuses in Thai cadavers. The anatomic variations of origins and its cutaneous branches of the superficial part of cervical plexus were identified and recorded. Results: The superficial part of cervical plexus derived from the ventral rami of C2, C3, and C4. Its branches consisted of the lesser occipital, great auricular, transverse cervical and supraclavicular nerves. These cutaneous (or superficial) nerves mainly derived from ventral rami of C2-C3 except the supraclavicular nerve from C3-C4. They supplied the skin and superficial structures of the head, neck and shoulder. The anatomic variations of these nerves occurred in both sides. There was no statistical difference with regard to either gender or side. Conclusions: The knowledge of the anatomic variations of cutaneous branches of the superficial cervical plexus from this study could be useful for clinicians in anesthesia blocks, surgical procedures, treatment of pain and abnormalities relating to these cervical nerves.