nerve to obturator internus

{{Short description|Human nerve}}

{{Distinguish|Obturator nerve}}

{{Infobox nerve

| Name = Nerve to obturator internus

| Latin = nervus musculi obturatorii interni

| Image = Gray828.png

| Caption = Plan of sacral plexus and pudendal plexus (nerve to the obturator internus and gemellus superior labeled at lower left)

| Image2 = Gray832.png

| Caption2 = Nerves of the right leg seen from behind (nerve to the obturator internus labeled at upper left)

| Innervates = Obturator internus and gemellus superior muscles

| BranchFrom = Sacral plexus

| BranchTo =

}}

The nerve to obturator internus (also known as the obturator internus nerve{{Citation needed|date=July 2023}}) is a mixed (sensory and motor){{Cite book |last=Mirjalili |first=S. Ali |title=Nerves and Nerve Injuries |publisher=Academic Press |year=2015 |isbn=978-0-12-410390-0 |volume=1: History, Embryology, Anatomy, Imaging, and Diagnostics |location= |pages=626 |chapter=Chapter 46 - Anatomy of the Sacral Plexus L4-S4 |doi=10.1016/B978-0-12-410390-0.00048-2 |chapter-url=https://www.sciencedirect.com/science/article/pii/B9780124103900000482}} nerve providing motor innervation to the obturator internus muscle and gemellus superior muscle, and sensory innervation to the hip joint. It is a branch of the sacral plexus. It is one of the group of deep gluteal nerves.{{Cite book |last1=Moore |first1=Keith L. |title=Clinically Oriented Anatomy |last2=Dalley |first2=Arthur F. |last3=Agur |first3=Anne M. R. |publisher=Wolters Kluwer |year=2018 |isbn=978-1-4963-4721-3 |edition=8th |location= |pages=733–734}}

It exits the pelvis through the greater sciatic foramen to innervate the gemellus superior muscle, then re-enters the pelvis to innervate the obturator internus muscle.

Structure

= Origin =

The nerve to obturator internus is a branch of the lumbosacral plexus.{{Citation|last1=Warner|first1=Tyler|title=Chapter 7 - The Nerve to Obturator Internus|date=2021-01-01|url=https://www.sciencedirect.com/science/article/pii/B9780323776028000076|work=Surgical Anatomy of the Sacral Plexus and Its Branches|pages=31–34|editor-last=Tubbs|editor-first=R. Shane|publisher=Elsevier|language=en|isbn=978-0-323-77602-8|access-date=2021-02-06|last2=Tubbs|first2=R. Shane|editor2-last=Iwanaga|editor2-first=Joe|editor3-last=Loukas|editor3-first=Marios|editor4-last=Dumont|editor4-first=Aaron S.}} It arises from the anterior divisions of (the anterior rami of) L5-S2.{{Cite book|last1=Chiva|first1=Luis M.|chapter-url=https://www.sciencedirect.com/science/article/pii/B978032342878100002X|title=Abdominal and Pelvic Anatomy|last2=Magrina|first2=Javier|date=2018-01-01|publisher=Elsevier|isbn=978-0-323-42878-1|pages=3–49|language=en|chapter=Chapter 2 - Abdominal and Pelvic Anatomy|doi=10.1016/b978-0-323-42878-1.00002-x}}

= Course and relations =

It emerges inferior to the piriformis muscle and exits the pelvis through the greater sciatic foramen. It travels round the base of the ischial spine lateral to the internal pudendal artery and nerve, and - while doing so - issues a branch to the gemellus superior, which enters the upper part of the posterior surface of the muscle.{{Citation needed|date=July 2023}} It then re-enters the pelvis through the lesser sciatic foramen to innervate the obturator internus muscle, piercing the pelvic surface of this muscle.{{Citation needed|date=July 2023}}

See also

References

{{Gray's}}

{{reflist}}

{{Lumbosacral plexus}}

{{Portal bar|Anatomy}}

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Category:Nerves of the lower limb and lower torso

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