Subcostal Nerve
Description
Name
- Subcostal Nerve
- 12th Intercostal nerve
- Nervus subcostalis
General
- Originates from the anterior/ ventral rami of T12
- Similar to intercostal nerves of T1-T11, however due its course below the ribs its considered separate
- Four branches: muscular, cutaneous, communicant and collateral branches
- Carries both motor and sensory
Anatomic Course
- Originates from the anterior ramus of spinal nerve T12
- Last and largest of the anterior branches of the thoracic spinal nerves
- Follows inferior marge of 12th rib, running with neurovascular bundle
- Passes in front of quadratus lumborum, pierces transversus abdominis, internal oblique
- Travels between them giving off communicating branch to iliohypogastric nerve, lumbar plexus
- Sends a muscular branch to pyramidalis, lateral cutaneous branch
Muscular Branches
Lateral Cutaneous Branch
- Pierces internal, external oblique muscles and runs towards the gluteal region
- After passing over the iliac crest, extends as low as the greater trochanter
- This branch innervates the skin overlying the anterior portion of the gluteal region
Collateral Branch
- Innervates the parietal peritoneum
- Peripheral parts of the diaphragm
Communicating Branch
- Merges with the iliohypogastric nerve of the lumbar plexus
Anterior Cutaneous Branch
- Terminal branch of the subcostal nerve
- Terminates in the anterior portion of the abdominal wall
- Supplies: skin over the lower abdomen, suprapubic region, inguinal region
Sensory Innervation
- Lower abdomen (suprapubic region)
- Inguinal region
- Anterior gluteal region
- Parietal Peritoneum
Motor Innervation
Clinical Significance
- Needs to be updated
See Also
References
- ↑ Image courtesy of elsevier.com
- ↑ Murinova, Natalia, Daniel Krashin, and Andrea M. Trescot. "Ilioinguinal nerve entrapment: pelvic." Peripheral Nerve Entrapments: Clinical Diagnosis and Management (2016): 467-477.
- ↑ Liyew, Worku Abie. "Clinical presentations of lumbar disc degeneration and lumbosacral nerve lesions." International journal of rheumatology 2020.1 (2020): 2919625.