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  2. Lumbosacral trunk - Wikipedia

    en.wikipedia.org/wiki/Lumbosacral_trunk

    The lumbosacral trunk is formed by the union of the entire anterior ramus of lumbar nerve L5 and a part of L4 [clarification needed]. [1] [2] [3] L4 first issues its branches to the lumbar plexus, then emerges from the medial border of the psoas muscle [3] to unite with the anterior ramus of L5 just superior to the pelvic brim to form the thick, cord-like trunk which [4] crosses the pelvic ...

  3. Lumbosacral plexus - Wikipedia

    en.wikipedia.org/wiki/Lumbosacral_plexus

    The anterior divisions of the lumbar nerves, sacral nerves, and coccygeal nerve form the lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic. For descriptive purposes this plexus is usually divided into three parts: lumbar plexus; sacral plexus; pudendal plexus

  4. Sacral plexus - Wikipedia

    en.wikipedia.org/wiki/Sacral_plexus

    the lumbosacral trunk; the anterior division of the first sacral nerve; portions of the anterior divisions of the second and third sacral nerves; The nerves forming the sacral plexus converge toward the lower part of the greater sciatic foramen, and unite to form a flattened band, from the anterior and posterior surfaces of which several ...

  5. Lumbar nerves - Wikipedia

    en.wikipedia.org/wiki/Lumbar_nerves

    The first three lumbar nerves, and the greater part of the fourth together form the lumbar plexus. The smaller part of the fourth joins with the fifth to form the lumbosacral trunk, which assists in the formation of the sacral plexus. The fourth nerve is named the furcal nerve, from the fact that it is subdivided between the two plexuses.

  6. Lumbar plexus - Wikipedia

    en.wikipedia.org/wiki/Lumbar_plexus

    It is formed by the divisions of the first four lumbar nerves (L1-L4) and from contributions of the subcostal nerve (T12), which is the last thoracic nerve. Additionally, the ventral rami of the fourth lumbar nerve pass communicating branches, the lumbosacral trunk, to the sacral plexus. The nerves of the lumbar plexus pass in front of the hip ...

  7. Sciatic nerve - Wikipedia

    en.wikipedia.org/wiki/Sciatic_nerve

    The lumbosacral trunk from the L4 and L5 roots descends between the sacral promontory and ala, and the S1 to S3 roots emerge from the ventral sacral foramina. These nerve roots unite to form a single nerve in front of the piriformis muscle. The nerve passes beneath the piriformis and through the greater sciatic foramen, exiting the pelvis.

  8. Sacrum - Wikipedia

    en.wikipedia.org/wiki/Sacrum

    The alae support the psoas major muscles and the lumbosacral trunk which connects the lumbar plexus with the sacral plexus. In the articulated pelvis, the alae are continuous with the iliac fossa. Each ala is slightly concave from side to side, and convex from the back and gives attachment to a few of the fibers of the iliacus muscle. The ...

  9. Posterior branches of the lumbar nerves - Wikipedia

    en.wikipedia.org/wiki/Posterior_branches_of_the...

    The medial branches run close to the articular processes of the vertebræ and end in the Multifidus.; The lateral branches supply the Sacrospinalis.The upper three give off cutaneous nerves which pierce the aponeurosis of the Latissimus dorsi at the lateral border of the Sacrospinalis and descend across the posterior part of the iliac crest to the skin of the buttock, some of their twigs ...

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