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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. 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.

  4. List of nerves of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_nerves_of_the...

    The lumbosacral plexus; The sacral and coccygeal nerves; The sympathetic nerves. The cephalic portion of the sympathetic system; The cervical portion of the sympathetic system; The thoracic portion of the sympathetic system; The abdominal portion of the sympathetic system; The pelvic portion of the sympathetic system; The great plexuses of the ...

  5. Sacrum - Wikipedia

    en.wikipedia.org/wiki/Sacrum

    The sacrum (pl.: sacra or sacrums [1]), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30. [ 2 ] The sacrum situates at the upper, back part of the pelvic cavity , between the two wings of the pelvis .

  6. Lumbar lymph trunk - Wikipedia

    en.wikipedia.org/wiki/Lumbar_lymph_trunk

    The lumbar trunks are formed by the union of the efferent vessels from the lateral aortic lymph nodes. They receive the lymph from the lower limbs , from the walls and viscera of the pelvis , from the kidneys and suprarenal glands and the deep lymphatics of the greater part of the abdominal wall .

  7. 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 ...

  8. 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.

  9. White ramus communicans - Wikipedia

    en.wikipedia.org/wiki/White_ramus_communicans

    Once they synapse in the sympathetic ganglion in the sympathetic trunk, they exit the trunk as gray rami to join the spinal nerve and innervate the appropriate structure. Even though the sympathetic trunk extends below L2, there are no more white rami communicantes below L2 because the intermediolateral cell column ends before this. The fibers ...

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