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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 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 ...

  4. 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.

  5. List of human anatomical regions - Wikipedia

    en.wikipedia.org/wiki/List_of_human_anatomical...

    the lumbar region encompassing the lower back. the sacral region occurring at the end of the spine, directly above the buttocks. The regions of the back of the arms, from superior to inferior, include the cervical region encompassing the neck, the acromial region encompassing the shoulder, the brachial region encompassing the upper arm,

  6. Sacral plexus - Wikipedia

    en.wikipedia.org/wiki/Sacral_plexus

    In human anatomy, the sacral plexus is a nerve plexus which provides motor and sensory nerves for the posterior thigh, most of the lower leg and foot, and part of the pelvis. It is part of the lumbosacral plexus and emerges from the lumbar vertebrae and sacral vertebrae (L4-S4). [ 1 ]

  7. File:Surface projections of the organs of the trunk.png

    en.wikipedia.org/wiki/File:Surface_projections...

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  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. 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

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