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Cutaneous innervation

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https://www.readbyqxmd.com/read/28817806/specialized-mechanosensory-nociceptors-mediating-rapid-responses-to-hair-pull
#1
Nima Ghitani, Arnab Barik, Marcin Szczot, James H Thompson, Chia Li, Claire E Le Pichon, Michael J Krashes, Alexander T Chesler
The somatosensory system provides animals with the ability to detect, distinguish, and respond to diverse thermal, mechanical, and irritating stimuli. While there has been progress in defining classes of neurons underlying temperature sensation and gentle touch, less is known about the neurons specific for mechanical pain. Here, we use in vivo functional imaging to identify a class of cutaneous sensory neurons that are selectively activated by high-threshold mechanical stimulation (HTMRs). We show that their optogenetic excitation evokes rapid protective and avoidance behaviors...
August 16, 2017: Neuron
https://www.readbyqxmd.com/read/28799442/the-use-of-innervated-radial-artery-superficial-palmar-branch-perforator-free-flap-for-complex-digital-injuries-reconstruction
#2
Zhenglin Chi, Georgios Pafitanis, Luis Eduardo Parra Pont, Roshan Vijayan, Stefano Marcelli, Weiyang Gao, Zan Li, Xiao Zhou, Dajiang Song, Peng Yang
Loco-regional flaps have been widely used for the reconstruction of digital injuries without requiring microvascular anastomosis, however, they result in scarring and compromised functional outcomes. This study demonstrates our experience utilizing the innervated radial artery superficial palmar branch (RASPB) perforator free flap for complex digital injury reconstruction. From May 2007 to March 2014, the innervated RASPB perforator free flap was used to reconstruct 79 distal complex hand and digital soft tissue defects of which 14 were used to re-vascularise the distal digit in a flow-through fashion...
August 11, 2017: Journal of Plastic Surgery and Hand Surgery
https://www.readbyqxmd.com/read/28760966/neuronal-cytoskeletal-gene-dysregulation-and-mechanical-hypersensitivity-in-a-rat-model-of-rett-syndrome
#3
Aritra Bhattacherjee, Ying Mu, Michelle K Winter, Jennifer R Knapp, Linda S Eggimann, Sumedha S Gunewardena, Kazuto Kobayashi, Shigeki Kato, Dora Krizsan-Agbas, Peter G Smith
Children with Rett syndrome show abnormal cutaneous sensitivity. The precise nature of sensory abnormalities and underlying molecular mechanisms remain largely unknown. Rats with methyl-CpG binding protein 2 (MeCP2) mutation, characteristic of Rett syndrome, show hypersensitivity to pressure and cold, but hyposensitivity to heat. They also show cutaneous hyperinnervation by nonpeptidergic sensory axons, which include subpopulations encoding noxious mechanical and cold stimuli, whereas peptidergic thermosensory innervation is reduced...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28747449/loss-of-cutaneous-large-and-small-fibers-in-naive-and-l-dopa-treated-pd-patients
#4
Maria Nolano, Vincenzo Provitera, Fiore Manganelli, Rosa Iodice, Annamaria Stancanelli, Giuseppe Caporaso, Annamaria Saltalamacchia, Francesca Califano, Bernardo Lanzillo, Marina Picillo, Paolo Barone, Lucio Santoro
OBJECTIVE: To study small and large fiber pathology in drug-naive and l-dopa-treated patients affected by Parkinson disease (PD) in early phases, before the occurrence of neuropathic electrophysiologic abnormalities. METHODS: We enrolled 85 patients with idiopathic PD (male/female 49/36, age 61.3 ± 9.7 years) without electrophysiologic signs of neuropathy, including 48 participants naive to l-dopa treatment. All patients underwent clinical, functional, and morphologic assessment of sensory and autonomic nerves through dedicated questionnaires, quantitative sensory testing, sympathetic skin response, dynamic sweat test, and punch biopsies from glabrous and hairy skin...
July 26, 2017: Neurology
https://www.readbyqxmd.com/read/28705167/inhibition-of-parkinsonian-tremor-with-cutaneous-afferent-evoked-by-transcutaneous-electrical-nerve-stimulation
#5
Man-Zhao Hao, Shao-Qin Xu, Zi-Xiang Hu, Fu-Liang Xu, Chuan-Xin M Niu, Qin Xiao, Ning Lan
BACKGROUND: Recent study suggests that tremor signals are transmitted by way of multi-synaptic corticospinal pathway. Neurophysiological studies have also demonstrated that cutaneous afferents exert potent inhibition to descending motor commands by way of spinal interneurons. We hypothesize in this study that cutaneous afferents could also affect the transmission of tremor signals, thus, inhibit tremor in patients with PD. METHODS: We tested this hypothesis by activating cutaneous afferents in the dorsal hand skin innervated by superficial radial nerve using transcutaneous electrical nerve stimulation (TENS)...
July 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28687815/postoperative-long-term-morbidity-of-extended-endoscopic-maxillectomy-for-inverted-papilloma
#6
G Bertazzoni, R Accorona, A Schreiber, G Pietrobon, A Karligkiotis, E Fazio, P Castelnuovo, P Nicolai
BACKGROUND: Extended endoscopic maxillectomy (Sturmann-Canfield procedure) allows full visualization of the maxillary sinus by sectioning the lacrimal duct and removing the medial part of the anterior maxillary wall. The aim of this study is to evaluate the morbidity of Sturmann-Canfield procedure in patients treated for inverted papilloma. METHODOLOGY: The clinical records of all patients treated with a Sturmann-Canfield procedure for inverted papilloma from October 2000 to September 2015 at two teaching hospitals were reviewed...
July 8, 2017: Rhinology
https://www.readbyqxmd.com/read/28633742/cutaneous-varicella-zoster-virus-infection-following-zoster-vaccination-report-of-post-vaccination-herpes-zoster-skin-infection-and-literature-review-of-zoster-vaccination-efficacy-and-guidelines
#7
Katherine M Stiff, Philip R Cohen
BackgroundHerpes zoster vaccine is currently recommended in the United States for immune competent individuals ≥60 years. The efficacy of the herpes zoster vaccine decreases with age and with time following vaccination.PurposeAn elderly man with herpes zoster following vaccination is described. The guidelines for vaccination and issues regarding re-vaccination are reviewed. METHODS: PubMed was used to search the following terms: efficacy, elderly, herpes zoster, herpes zoster incidence, herpes zoster recurrence, and vaccination...
June 15, 2017: Dermatology Online Journal
https://www.readbyqxmd.com/read/28617716/hybrid-blocks-for-total-knee-arthroplasty-a-technical-description
#8
David F Johnston, Rakesh V Sondekoppam, Vishal Uppal, James L Howard, Sugantha Ganapathy
This narrative review article aims to examine current evidence of knee innervation in order to develop a technique of targeting pure sensory innervation of the knee joint without compromising motor function. A literature review of knee innervation was performed to gain an anatomic understanding of terminal sensory branches of the relevant target nerves (femoral, obturator, sciatic, and lateral femoral cutaneous). Pure sensory block of the knee joint is challenging due to important contributions from the muscular innervation close to the joint and the variability of nerves afferents contained within and around the adductor canal...
June 14, 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/28551063/-superior-gluteal-nerve-a-new-block-on-the-block
#9
Miguel Sá, Rita Graça, Hugo Reis, José Miguel Cardoso, José Sampaio, Célia Pinheiro, Duarte Machado
BACKGROUND AND OBJECTIVES: The superior gluteal nerve is responsible for innervating the gluteus medius, gluteus minimus and tensor fascia latae muscles, all of which can be injured during surgical procedures. We describe an ultrasound-guided approach to block the superior gluteal nerve which allowed us to provide efficient analgesia and anesthesia for two orthopedic procedures, in a patient who had significant risk factors for neuraxial techniques and deep peripheral nerve blocks. CLINICAL REPORT: An 84-year-old female whose regular use of clopidogrel contraindicated neuraxial techniques or deep peripheral nerve blocks presented for urgent bipolar hemiarthroplasty in our hospital...
May 24, 2017: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/28521269/a-new-technique-for-dorsal-sural-nerve-conduction-study-with-surface-strip-electrodes
#10
Shoji Hemmi, Katsumi Kurokawa, Taiji Nagai, Ryutaro Kushida, Toshio Okamoto, Tatsufumi Murakami, Yoshihide Sunada
OBJECTIVE: To obtain higher amplitude of dorsal sural sensory nerve action potentials (SNAPs), we used a new method for dorsal sural nerve conduction study with surface strip electrodes (SSEs). METHODS: Dorsal sural SNAPs were recorded orthodromically. The recording electrodes were placed behind the lateral malleolus. SSEs were attached to the laterodorsal aspect of the foot for stimulation of the dorsal sural nerve (DSN). We also used a conventional method with a standard bipolar stimulator and compared the findings...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28476948/hierarchical-specification-of-pruriceptors-by-runt-domain-transcription-factor-runx1
#11
Lu Qi, Chengcheng Huang, Xiaohua Wu, Yeqi Tao, Jingjing Yan, Tianyong Shi, Cheng Cao, Lu Han, Mengsheng Qiu, Qiufu Ma, Zijing Liu, Yang Liu
The somatic sensory neurons in dorsal root ganglia (DRG) detect and transmit a diverse array of sensory modalities, such as pain, itch, cold, warm, touch and others. Recent genetic and single-cell RNA sequencing studies have revealed a group of DRG neurons that could be particularly relevant for acute and chronic itch information transmission. They express the natriuretic peptide type B (NPPB), as well as a cohort of receptors and neuropeptides that have been implicated in chronic itch manifestation, including the interleukin-31 receptor IL31ra and its co-receptor Osmr, the leuktriene receptor Cysltr2, somatostatin and neurotensin...
May 5, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28468842/novel-mutations-in-dystonin-provide-clues-to-the-pathomechanisms-of-hsan-vi
#12
Fiore Manganelli, Silvia Parisi, Maria Nolano, Feifei Tao, Simona Paladino, Chiara Pisciotta, Stefano Tozza, Claudia Nesti, Adriana P Rebelo, Vincenzo Provitera, Filippo M Santorelli, Michael E Shy, Tommaso Russo, Stephan Zuchner, Lucio Santoro
OBJECTIVE: To describe a second hereditary sensory autonomic neuropathy type VI (HSAN-VI) family harboring 2 novel heterozygous mutations in the dystonin (DST) gene and to evaluate their effect on neurons derived from induced pluripotent stem cells (iPSC). METHODS: The family consisted of 3 affected siblings from nonconsanguineous healthy parents. All members underwent clinical and electrophysiologic evaluation and genetic analysis. Two patients underwent quantitative sensory testing (QST), cardiovascular reflexes, dynamic sweat test, and skin biopsy to evaluate somatic and autonomic cutaneous innervation and to get fibroblast cultures for developing iPSC-derived neurons...
May 30, 2017: Neurology
https://www.readbyqxmd.com/read/28446581/cl-channel-is-required-for-cxcl10-induced-neuronal-activation-and-itch-response-in-a-murine-model-of-allergic-contact-dermatitis
#13
Lintao Qu, Kai Fu, Steven G Shimada, Robert H LaMotte
Persistent itch often accompanies allergic contact dermatitis (ACD), but the underlying mechanisms remain largely unexplored. We previously demonstrated that CXCL10/CXCR3 signaling activated a subpopulation of cutaneous primary sensory neurons and mediated itch response after contact hypersensitivity (CHS), a murine model of ACD, induced by squaric acid dibutylester. The purpose of this study was to determine the ionic mechanisms underlying CXCL10-induced neuronal activation and allergic itch. In whole cell recordings, CXCL10 triggered a current in dorsal root ganglion (DRG) neurons innervating the area of CHS...
July 1, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28436279/treatment-of-painful-radiculopathies-with-capsaicin-8-cutaneous-patch
#14
R Baron, R D Treede, F Birklein, T Cegla, R Freynhagen, M L Heskamp, K U Kern, C Maier, R Rolke, S Seddigh, C Sommer, S Ständer, C Maihöfner
BACKGROUND AND OBJECTIVE: The treatment of neuropathic pain due to low-back (lumbosacral) radiculopathies, a common source of neuropathic pain, is challenging and often requires a multimodal therapeutic approach. The capsaicin 8% patch is the first topical analgesic licensed for peripheral neuropathic pain. To evaluate this treatment, a subset of patients with painful radiculopathy (lumbar and cervical, including ventral and dorsal rami) enrolled into the multicenter, non-interventional QUEPP study (Qutenza (2) - safety and effectiveness in peripheral neuropathic pain) was analyzed...
May 4, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/28428928/origin-branching-and-communications-of-the-intercostobrachial-nerve-a-meta-analysis-with-implications-for-mastectomy-and-axillary-lymph-node-dissection-in-breast-cancer
#15
REVIEW
Brandon Michael Henry, Matthew J Graves, Jakub R Pękala, Beatrice Sanna, Wan Chin Hsieh, R Shane Tubbs, Jerzy A Walocha, Krzysztof A Tomaszewski
The intercostobrachial nerve (ICBN), which usually originates from the lateral cutaneous branch of the second intercostal nerve, innervates areas of the axilla, lateral chest, and medial arm. It is at risk for injury during operative procedures that are often used in the management of breast cancer and such injury has been associated with postoperative sensory loss and neuropathic pain, decreasing the quality of life. PubMed, Excerpta Medica Database (EMBASE), ScienceDirect, Google Scholar, China National Knowledge Infrastructure (CNKI), Scientific Electronic Library Online (SciELO), Biosciences Information Service (BIOSIS), and Web of Science were searched comprehensively...
March 17, 2017: Curēus
https://www.readbyqxmd.com/read/28417038/anomalous-innervation-of-the-median-nerve-in-the-arm-in-the-absence-of-the-musculocutaneous-nerve
#16
Khursheed Raza, Seema Singh, Neerja Rani, Raghav Mishra, Kamakshi Mehta, Saroj Kaler
The brachial plexus innervates the upper extremities. While variations in the formation of the brachial plexus and its terminal branches are quite common, it is uncommon for the median nerve to innervate the muscles of the arm. During the dissection of an elderly male cadaver at the Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India, in 2016, the coracobrachialis muscle was found to be supplied by a direct branch from the lateral root of the median nerve and the musculocutaneous nerve was absent...
February 2017: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/28398686/oligosynaptic-inhibition-of-group-ia-afferents-from-brachioradialis-to-triceps-brachii-motor-neurons-in-humans
#17
Toshiaki Sato, Mitsuhiro Nito, Katsuhiko Suzuki, Hiromi Fujii, Wataru Hashizume, Takuji Miyasaka, Masaomi Shindo, Akira Naito
INTRODUCTION: Effects of low-threshold afferents from the brachioradialis (BR) on excitabilities of triceps brachii (TB) motor neurons in humans were examined. METHODS: We evaluated the effects using a post-stimulus time-histogram (PSTH) and electromyogram-averaging (EMG-A) methods in thirteen healthy human subjects. Electrical conditioning stimulation to the radial nerve branch innervating BR with the intensity below the motor threshold was delivered. RESULTS: In the PSTH study, the stimulation produced a trough (inhibition) in 36/69 TB motor units for all the subjects...
April 11, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28381446/cutaneous-trpm8-expressing-sensory-afferents-are-a-small-population-of-neurons-with-unique-firing-properties
#18
Michael P Jankowski, Kristofer K Rau, H Richard Koerber
It has been well documented that the transient receptor potential melastatin 8 (TRPM8) receptor is involved in environmental cold detection. The role that this receptor plays in nociception however, has been somewhat controversial since conflicting reports have shown different neurochemical identities and responsiveness of TRPM8 neurons. In order to functionally characterize cutaneous TRMP8 fibers, we used two ex vivo somatosensory recording preparations to functionally characterize TRPM8 neurons that innervate the hairy skin in mice genetically engineered to express GFP from the TRPM8 locus...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28369282/recessive-dystrophic-epidermolysis-bullosa-results-in-painful-small-fibre-neuropathy
#19
Sofia von Bischhoffshausen, Dinka Ivulic, Paola Alvarez, Victor C Schuffeneger, Juan Idiaquez, Constanza Fuentes, Pilar Morande, Ignacia Fuentes, Francis Palisson, David L H Bennett, Margarita Calvo
Small fibres in the skin are vulnerable to damage in metabolic or toxic conditions such as diabetes mellitus or chemotherapy resulting in small fibre neuropathy and associated neuropathic pain. Whether injury to the most distal portion of sensory small fibres due to a primary dermatological disorder can cause neuropathic pain is still unclear. Recessive dystrophic epidermolysis bullosa (RDEB) is a rare condition in which mutations of proteins of the dermo-epidermal junction lead to cycles of blistering followed by regeneration of the skin...
March 28, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28358935/comparison-of-neurovascular-characteristics-of-facial-skin-in-patients-after-primary-and-revision-rhytidectomies
#20
Farhad Ardeshirpour, Elisabeth Hurliman, Gwen Wendelschafer-Crabb, Brian McAdams, Peter A Hilger, William R Kennedy, Amy Anne D Lassig, Michael J Brenner
Importance: Wound healing influences both the cosmetic and functional outcomes of facial surgery. Study of cutaneous innervation may afford insight into patients' preoperative wound healing potential and aid in their selection of appropriate surgical procedures. Objective: To present the quantitative and qualitative differences of epidermal nerve fibers (ENFs), neurotransmitters, vasculature, and mast cells in facial skin among patients after primary and revision rhytidectomies...
March 30, 2017: JAMA Facial Plastic Surgery
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