Objective: Back pain is an elusive symptom complicated by a variety of possible causes, precipitating and maintaining factors, and consequences. Notably, the underlying pathology remains unknown in a significant number of cases. Changes to the intervertebral disc (IVD) have been associated with back pain, leading many to postulate that the IVD may be a direct source of pain, typically referred to as discogenic back pain. Yet, despite decades of research into the neuroanatomy of the IVD, there is a lack of consensus in the literature as to the distribution and function of neural elements within the tissue. The current scoping review provides a comprehensive systematic overview of studies that document the topography, morphology, and immunoreactivity of neural elements within the IVD in humans. <uMel>thod: Articles were retrieved from six separate databases in a three-step systematic search, and independently evaluated by two reviewers. <Resul>ults: Three categories of neural elements were described within the IVD: perivascular nerves, sensory nerves independent of blood vessels, and mechanoreceptors. Nerves were consistently localized within the outer layers of the annulus fibrosus. Neural ingrowth into the inner annulus fibrosus and nucleus pulposus was found to occur only in degenerative states and disease states. Conclusion: While the pattern of innervation within the IVD is clear, the specific topographic arrangement and function of neural elements in the context of back pain remains unclear.
Injury to the nerves of the aortic-and superior hypogastric plexuses during retroperitoneal surgery often results in significant post-operative complications, including retrograde ejaculation and/or loss of seminal emission in males. Although previous characterizations of these plexuses have done well to provide a basis for understanding the typical anatomy, additional research into the common variations of these plexuses could further optimize nerve-sparing techniques for retroperitoneal surgery. To achieve this, the present study aimed to document the prevalence and positional variability of the infrarenal lumbar splanchnic nerves (LSNs) through gross dissection of 26 human cadavers. In almost all cases, two LSNs were observed joining each side of the aortic plexus, with 48% (left) and 33% (right) of specimens also exhibiting a third joining inferior to the left renal vein. As expected, the position of the LSNs varied greatly between specimens. That said, the vast majority (98%) of LSNs joining the aortic plexus were found to originate from the lumbar sympathetic trunk above the level of the inferior mesenteric artery. It was also found that, within specimens, adjacent LSNs often coursed in parallel. In addition to these nerves, 85% of specimens also demonstrated retroaortic LSN(s) that were angled more inferior compared with the other LSNs (P < 0.05), and exhibited a unique course between the aorta/common iliac arteries and the left common iliac vein before joining the superior hypogastric plexus below the aortic bifurcation. These findings may have significant implications for surgeons attempting nerve-sparing procedures of the sympathetic nerves in the infrarenal retroperitoneum such as retroperitoneal lymphadenectomies. We anticipate that the collective findings of the current study will help improve such retroperitoneal nerve-sparing surgical procedures, which may assist in preserving male ejaculatory function post-operatively.
Background Microglia are tissue resident macrophages with a wide range of critically important functions in central nervous system development and homeostasis. Method In this study, we aimed to characterize the transcriptional landscape of ex vivo human microglia across different developmental ages using cells derived from pre-natal, pediatric, adolescent, and adult brain samples. We further confirmed our transcriptional observations using ELISA and RNAscope. Results We showed that pre-natal microglia have a distinct transcriptional and regulatory signature relative to their post-natal counterparts that includes an upregulation of phagocytic pathways. We confirmed upregulation of CD36, a positive regulator of phagocytosis, in pre-natal samples compared to adult samples in situ. Moreover, we showed adult microglia have more pro-inflammatory signature compared to microglia from other developmental ages. We indicated that adult microglia are more immune responsive by secreting increased levels of pro-inflammatory cytokines in response to LPS treatment compared to the pre-natal microglia. We further validated in situ up-regulation of IL18 and CXCR4 in human adult brain section compared to the pre-natal brain section. Finally, trajectory analysis indicated that the transcriptional signatures adopted by microglia throughout development are in response to a changing brain microenvironment and do not reflect predetermined developmental states. Conclusion In all, this study provides unique insight into the development of human microglia and a useful reference for understanding microglial contribution to developmental and age-related human disease.
Background: REBOA is an emerging technique in trauma. However, inadvertent iliac artery balloon inflation can lead to complications. This study aims to investigate the safety characteristics of the COBRA-OS™ compared to a 7 Fr commercially available device during purposeful iliac artery balloon overinflation. Methods: In vitro: the COBRA-OS™ was inflated in explanted porcine iliac arteries and intentionally overinflated until balloon or vessel rupture occurred. In vivo: the COBRA-OS™ and 7 Fr device were deployed in the iliac arteries and intentionally overinflated until rupture of the balloon or blood vessel. Results: In vitro: an average volume of 1mL was required for occlusion using the COBRA-OS™ and the mean balloon rupture volume was 32.5mL. The COBRA-OS™ partially migrated into the aorta in all cases. In vivo: the COBRA-OS™ and 7 Fr device occluded the iliac arteries with a mean volume of 3.5 mL. Overinflation resulted in no iliac ruptures with the COBRA-OS™ (mean balloon rupture volume = 10mL). Overinflation with the 7 Fr device resulted in 1 iliac rupture at 5mL. The other two 7 Fr devices had a mean balloon rupture volume of 5 mL. All COBRA-OS™ devices moved partially up into the aorta during inflation while all 7 Fr devices remained in the iliac artery. Conclusions: The COBRA-OS™ allows for significant overinflation when deployed in the common iliac artery of a porcine model due to its unique design. This ultimately may help to prevent balloon and blood vessel rupture during clinical use, however further studies are required.
Anatomy education continues to evolve in health professional programs as curricula shift to competency‐based models and contact hours decrease. These changes in curricula may significantly alter the learning environment for students. Importantly, changes in learning environment have been shown to impact student learning strategies and well‐being. It follows, then, that an investigation of students' perceptions of the learning environment is key to understand the impact of modern anatomy curriculum alterations. The current pilot study evaluated the impact of modifying examination format on the learning environment of physical therapy students participating in a human cadaveric anatomy course. Two study cohorts of first year (entry‐level) physical therapy students were invited to complete a preliminary learning environment questionnaire with 13 visual analog scale items and four short answer items. One study cohort was tested with a viva (oral) practical examination, and the other, with a bell‐ringer practical examination. Analysis of quantitative items revealed two significant findings: physical therapy students in the bell‐ringer cohort found it was more difficult to prepare for their examination, and that they had inadequate time to respond to questions compared to the viva cohort. Analysis of qualitative items revealed distinct themes that concerned physical therapy student learning environment specific to cadaveric anatomy. These results demonstrate that examination format can influence the learning environment of physical therapy students studying cadaveric anatomy. As a result, care needs to be taken to ensure that modernized curricula align the examination format to the method of instruction and the future application of students' knowledge in clinical practice.
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