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Related Concept Videos

Spinal Nerves: Plexus II01:21

Spinal Nerves: Plexus II

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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
The Lumbar Plexus
The lumbar plexus is situated within the lumbar region of the back and is primarily formed by the first four lumbar spinal nerves (L1 to L4). This plexus extends its branches into several nerves, including the...
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Spinal Nerves: Anatomy01:23

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Spinal nerves are pivotal conduits in the nervous system, bridging the central nervous system (CNS) with the peripheral nervous system (PNS). These nerves enable a complex communication network between the brain, spinal cord, and the rest of the body, facilitating sensory input, motor output, and autonomic functions.
There are 31 bilateral pairs of spinal nerves, each emerging from the spinal cord through the intervertebral foramina—openings between adjacent vertebrae. These nerves are...
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The external iliac artery transitions out of the body cavity, entering the femoral region of the lower leg, and is renamed the femoral artery at the point where it traverses the body wall. This artery is responsible for the distribution of blood to the thigh's deep muscles and the skin's ventral and lateral regions, achieved through several minor branches and the lateral deep femoral artery, which also spawns a lateral circumflex artery. The knee area receives blood from the genicular...
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Muscles that Move the Thigh01:20

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The thigh's motion is primarily governed by muscles originating in the pelvic girdle and inserted into the femur. One crucial muscle, the iliopsoas, is a combination of the psoas major and the iliacus muscles, sharing a common insertion point on the lesser trochanter of the femur.
Three other significant muscles are the gluteus maximus, gluteus medius, and gluteus minimus. The gluteus maximus originates from the posterior surface of the ilium, sacrum, and coccyx, and the thoracolumbar...
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The parasympathetic division of the autonomic nervous system (ANS) regulates rest and digestion functions in the body. It works in opposition to the sympathetic division, promoting relaxation, conservation of energy, and digestion. The parasympathetic division consists of preganglionic fibers originating from specific cranial nerves (III, VII, IX, X) and the sacral spinal nerves (S2-S4). These fibers synapse with postganglionic neurons in the terminal ganglia, innervating various organs and...
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Abdominal Aorta01:25

Abdominal Aorta

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Once the aorta traverses the diaphragmatic plane at the aortic hiatus, it is known as the abdominal aorta. This anatomical structure is positioned leftward of the spinal column, encased within a cocoon of adipose tissue behind the peritoneal cavity. It terminates at the L4 vertebra, where it splits into the common iliac arteries. Prior to this bifurcation, the abdominal aorta gives rise to several vital branches.
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Modified Spared Nerve Injury Surgery Model of Neuropathic Pain in Mice
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Sacroiliac innervation.

Hanno Steinke1, Toshiyuki Saito2, Janne Kuehner3

  • 1Department of Anatomy, University Leipzig, Liebigstr. 13, 04103, Leipzig, Germany. steinke@medizin.uni-leipzig.de.

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
|August 27, 2022
PubMed
Summary

Nerves innervating the sacroiliac joint (SIJ) travel dorsally through ligamentous compartments. These neurovascular bundles, potentially causing SIJ pain when impinged, are found in specific gaps and tunnels.

Keywords:
CollagenEntrapmentImpingementLigament painSacroiliac jointSacroiliac pain

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Area of Science:

  • Anatomy
  • Neuroscience
  • Pain Research

Background:

  • Sacroiliac joint (SIJ) pain is a common clinical issue.
  • Understanding the precise innervation of the SIJ is crucial for diagnosing and treating associated pain.

Purpose of the Study:

  • To investigate the detailed innervation pattern of the dorsal sacroiliac region.
  • To determine if nerves reach the SIJ by passing through ligamentous compartments, hypothesizing this as a source of dorsal SIJ pain.

Main Methods:

  • Analysis of over 50 human specimens using plastination and histological staining.
  • Detailed mapping of nerves in the sacroiliac region.
  • Construction of 3D models to visualize neuroanatomical pathways.

Main Results:

  • Neurovascular bundles, formed by spinal nerve branches (L5-S1 and S1-S4) and vessels, were identified within fatty connective tissue in gaps and tunnels.
  • Nerves pass through inner and outer sacroiliac ligaments but do not directly reach the SIJ itself.
  • Observed gaps and tunnels connect to the dorsal SIJ, suggesting a potential pathway for innervation and pain.

Conclusions:

  • The study refines the understanding of sacroiliac innervation, correlating it with clinical terms like "sacroiliac pain."
  • The findings support the hypothesis that impingement of neurovascular bundles within specific anatomical structures may cause SIJ pain.
  • Watery gaps and tunnels are implicated as significant factors in SIJ innervation and the etiology of SIJ pain.