scholarly journals Experiments in examination of the peripheral distribution of the fibres of the posterior roots of some spinal nerves. Part II

1897 ◽  
Vol 60 (359-367) ◽  
pp. 408-411 ◽  
Keyword(s):  
Cranial Nerves ◽  
Sensory Nerve ◽  
Nerve Roots ◽  
Spinal Nerves

This paper is in continuation of one brought before the Society in 1892, and published in ‘Phil. Trans.,’ B, vol. 184. In that communication the peripheral distribution of the sensory nerve-roots of the sacro-lumbar and the thoracic regions was examined. In the present the examination is extended to the cervical and brachial sensory roots, and to the skin distribution of the cranial nerves.

scholarly journals Trigeminal Ophthalmic Branch Schwannoma: Case Report and Literature Review

2020 ◽  
Author(s):  
Luiza Rech Köhler ◽  
Paulo Moacir Mesquita Filho ◽  
Fabio Pires Santos ◽  
Renato Sawasaki ◽  
Richard Giacomelli ◽  
...  
Keyword(s):  
Case Report ◽  
Facial Pain ◽  
Cranial Nerves ◽  
Sensory Nerve ◽  
Intracranial Tumors ◽  
Nerve Roots ◽  
Primary Neoplasms ◽  
Ophthalmic Branch ◽  
The Brain ◽  
Central Lesions

AbstractSchwannomas are the fourth most common primary neoplasms affecting the brain and cranial nerves. Central lesions commonly arise from sensory nerve roots, and a common intracranial site is the vestibular branch of the 8th nerve (>85%). We present the case report of a patient who has a schwannoma extending from the pterygopalatine fossa to the orbit, complaining about facial pain in the trajectory of the trigeminal ophthalmic branch. Schwannomas represent 1 to 2% of all neoplasms of the orbit, and trigeminal schwannomas are extremely rare, accounting for less than 0.5% of all intracranial tumors.

Lumbosacral intersegmental epispinal axons and ectopic ventral nerve rootlets

1987 ◽  
Vol 67 (2) ◽  
pp. 269-277 ◽  
Author(s):  
Wesley W. Parke ◽  
Ryo Watanabe
Keyword(s):  
Nerve Root ◽  
Sensory Nerve ◽  
Conus Medullaris ◽  
Spinal Nerve ◽  
Nerve Fibers ◽  
Ventral Horn ◽  
Spinal Nerve Roots ◽  
Nerve Roots ◽  
Content Type ◽  
Almost All

✓ An epispinal system of motor axons virtually covers the ventral and lateral funiculi of the human conus medullaris between the L-2 and S-2 levels. These nerve fibers apparently arise from motor cells of the ventral horn nuclei and join spinal nerve roots caudal to their level of origin. In all observed spinal cords, many of these axons converged at the cord surface and formed an irregular group of ectopic rootlets that could be visually traced to join conventional spinal nerve roots at one to several segments inferior to their original segmental level; occasional rootlets joined a dorsal nerve root. As almost all previous reports of nerve root interconnections involved only the dorsal roots and have been cited to explain a lack of an absolute segmental sensory nerve distribution, it is believed that these intersegmental motor fibers may similarly explain a more diffuse efferent distribution than has previously been suspected.

A study of the development of the head and pharynx of the larval urodele Hynobius and its bearing on the evolution of the vertebrate head

1959 ◽  
Vol 242 (690) ◽  
pp. 151-204 ◽  
Keyword(s):  
Cranial Nerves ◽  
Blood System ◽  
The Other ◽  
Neural Arch ◽  
Classical View ◽  
Spinal Nerves ◽  
Anatomical Features ◽  
Muscle Nerve ◽  
11Th Segment ◽  
Nasal Capsule

The early development of the head and pharynx of Hynobius nebulosus (11.5 to 32 mm long) and retardatus (27 and 37 mm specimens) was investigated in some detail from transverse serial microtome sections. Analysis included the chondrocranium, jaws and hyobranchial skeleton, ossifications, cranial and anterior spinal nerves, musculature, blood system and other associated anatomical features. The structure of the skeletogenous elements in general agreed with earlier descriptions. However, a rudimentary fenestra lateralis nasi is found in the nasal capsule of H. nebulosus , hitherto not reported, and a complete cartilaginous processus pterygoideus, confluent with the trabecula and inner margin of the lamina orbito-nasalis described by Edgeworth (1923 a ), was not extant in any Hynobius specimen. H. retardatus has a hypoglossal foramen (and nerve) and joins H. nebulosus (Fox 1957), Cryptobranchus japonicus and alleghaniensis as the only living Amphibia to possess this structure. The neural arch homology of the occipital crest is reaffirmed. The columella stilus of the 32 mm H. nebulosus is confluent with the pterygo-quadrate cartilage and because the hyoid and columella have a common blastematous origin in Hypogeophis (Marcus 1910), it is suggested that there was an ancestral cartilaginous continuity between the hyoid and pterygo-quadrate cartilage, similar to the commissura terminales of the branchiale. This feature would further emphasize the branchial segmental homologies of the mandibular cartilage, hyoid and branchiale. The pattern of the cranial nerves is similar to that of other urodele larvae and the arrangement of the profundus and maxillaris nerves supports the view of the descent of urodeles from porolepiforme crossopterygians (Jarvik 1942). There is a segmental series of eleven head-pharynx segments, a complete branchial segment including a levator muscle, nerve, cartilage bar and gill cleft. Each post-hyoid segment is complete except for the absence of branchiale V and VI, and behind the fourth functional gill cleft there are three vestigial blind ones and then the larynx and trachea leading to the lungs. The masseter (2nd segment), digastricus (3rd segment), dilator laryngeus (10th segment) and trapezius (11th segment) are considered to be the homologues of the other six intervening levator gill arch muscles. The arytenoid and tracheal cartilages are considered to be branchial bars of the 10th and 11th segments respectively, and the lungs to have developed from gill pouches of the 11th segment which failed to reach the exterior early in vertebrate evolution. The classical view of the homology of the laryngo-tracheal skeleton with a branchial bar enunciated by Gegenbaur and Wilder independently in 1892 is therefore upheld; disagreement is merely a numerical one. The basic segmental components of the amphibian head and pharynx are modified in ontogeny by omission, distortion or addition, in order to fit the animal for a terrestrial existence.

Unknown fatal encephalomyelopolyradiculoneuritis in a child. A case report

2021 ◽  
Vol 2 (2) ◽  
pp. 100-106
Author(s):  
Aleksandra I. Pavlyuchkova ◽  
Aleksey S. Kotov
Keyword(s):  
Spinal Cord ◽  
Cerebrospinal Fluid ◽  
Genetic Diseases ◽  
Cranial Nerves ◽  
Unknown Etiology ◽  
Active Therapy ◽  
Nerve Roots ◽  
Child Patient ◽  
Brain And Spinal Cord ◽  
The Brain

In childhood, various infectious, autoimmune, genetic diseases can manifest. We present a case of fatal encephalomyelopolyradiculoneuritis of unknown etiology in a 9-year-old child. Patient N.K. in February 2019, noted an increase in temperature to subfebrile values, received symptomatic and antibiotic therapy without effect. An increase in protein and lymphocytes was found in the cerebrospinal fluid. According to MRI data, the emergence of more and more foci of the pathological signal in the brain and spinal cord, cranial nerves and nerve roots of the lumbar plexus was noted. Known infectious and autoimmune diseases were excluded. Despite active therapy with glucocorticoids, antibiotics, antiviral drugs, immunoglobulin, the disease continued to progress, and the patient died in April 2020.

Cranial Reflexes and Related Techniques

2016 ◽  
pp. 347-360 ◽  
Author(s):  
Benn E. Smith
Keyword(s):  
Electrophysiological Study ◽  
Cranial Nerves ◽  
Sensory Nerve ◽  
Blink Reflex ◽  
Branchial Arch ◽  
Sensory Receptor ◽  
Contact Heat ◽  
Masseter Inhibitory Reflex ◽  
Stem Lesions ◽  
Facial Synkinesis

Electrophysiological study of the function of cranial nerves, particularly the fifth and seventh cranial nerves, may be useful for assessing cranial neuropathies or facial movement disorders, such as hemifacial spasm or facial synkinesis. Several electrophysiological techniques are available in clinical neurophysiology laboratories to study these nerves and cranial reflexes. These techniques can also provide useful information in some cases of peripheral neuropathy, polyradiculoneuropathy, and brain stem lesions. This chapter reviews the concepts, methods, and applications of cranial reflexes, including the blink reflex, the jaw jerk (or masseter reflex), and the masseter inhibitory reflex (MIR). Two additional techniques—one to assess a sensory nerve in the head that is not a cranial nerve of branchial arch origin, the great auricular sensory nerve, and the other to interrogate trigeminal sensory pathways from the sensory receptor level to the parietal cortex, contact heat evoked potentials—are also discussed.

XIII. On certain functions of the spinal chord, with further investigations into its structure

1853 ◽  
Vol 143 ◽  
pp. 347-356 ◽  
Keyword(s):  
Royal Society ◽  
Nerve Roots ◽  
Exact Relation ◽  
Spinal Nerves ◽  
Object A ◽  
Physiological Importance ◽  
Spinal Chord ◽  
The Subject ◽  
The Brain ◽  
Difficult Subject

When I had the honour of laying before the Royal Society my former researches on the structure of the spinal chord, I intimated an intention of preparing another communication on the structure of the medulla oblongata and cerebellum; but as many important points in the minute anatomy of the chord still remained in obscurity, I thought it advisable to make them first the subject of special inquiry, as far as the new method I employed would enable me to proceed. Moreover, as all investiga­tions into the structure of any organ have, or ought to have, for their object a clearer and better knowledge of its functions, I have undertaken also to communicate in this paper whatever physiological deductions may appear to follow from my observa­tions. Having no particular theory to support, and being influenced in these inquiries by no other feeling than the simple desire to elicit truth, the greatest care has been taken to verify my facts, and caution has been exercised in drawing conclusions from them. It is a question of great interest and physiological importance, whether the roots of the spinal nerves belong exclusively to the spinal chord, or whether part of them ascend within either the white or the grey columns, and form the channels by which impressions are transmitted to and from the brain. On account of its interest and importance, I have employed much time and labour in endeavouring to arrive at some well-grounded and settled conclusion on this very difficult subject, having devoted to it alone many hours daily for nearly five months. So extremely intricate, however, is the internal structure of the chord; so numerous are the planes in which the nerve-roots enter the grey substance; and so various are the directions which they pursue within it, that notwithstanding the perfect transparency of my prepara­tions, and the sharp outline which their fibres retain, my efforts to determine the exact relation between these roots and the white and grey columns appeared for some time almost hopeless; but by varying my dissections according to the exigencies of each case of difficulty, I succeeded in arriving at several results which I believe will be considered important.

scholarly journals II. Experiments in examination of the peripheral distribution the fibres of the posterior roots of some spinal nerves. -Part II

1898 ◽  
Vol 190 ◽  
pp. 45-186 ◽  
Keyword(s):  
Spinal Nerve ◽  
Spinal Reflexes ◽  
Spinal Nerve Roots ◽  
Nerve Roots ◽  
Spinal Nerves

The present research has been- directed tow ards further examination of the distribution of the spinal nerve-roots. It has been pursued in continuance of previous experi­ments dealing with the spinal pairs below the brachial. The communication treats of especially the skin-fields of the cranial and cervico-brachial nerves. In order to obtain a more perfect idea of the scheme of distribution of each entire spinal nerve the muscular fields of the spinal nerves of the limb region have been concurrently determined by separate experiments. Finally, these motor and sensory fields having been delimited, and thus the requisite prelimen to the original aim of the inquiry carried through, the examination of certain spinal reflexes has been proceeded to. I beg to sincerely thank Professor Michael Foster for his kind encouragement throughout.

scholarly journals Microsurgical resection of giant T11/T12 conus cauda equine schwannoma

2020 ◽  
Author(s):  
Alisa Arnautovic ◽  
Mirza Pojskic ◽  
Kenan Arnautovic
Keyword(s):  
Motor Evoked Potentials ◽  
Tumor Resection ◽  
Cauda Equina ◽  
Sensory Nerve ◽  
Gross Total Resection ◽  
Nerve Roots ◽  
Total Resection ◽  
Who Grade ◽  
Extramedullary Tumor ◽  
Microsurgical Resection

In this video, we highlight the anatomy involved with microsurgical resection of a giant T11/T12 conus cauda equine schwannoma. Spinal schwannoma remains the third most common intradural spinal tumor. Tumors undergoing gross total resection usually do not recur. To our knowledge, this is the first video case report of giant cauda equina schwannoma resection. A 55-year-old female presented with paraparesis and urinary retention. Lumbar spine MRI revealed contrast-enhancing intradural extramedullary tumor at the T11/T12 level. Surgery was performed in a prone position with intraoperative neurophysiology monitoring (somatosensory and motor evoked potentials - SSEP and MEP). T11/T12 laminectomies were performed. After opening the dura and arachnoid, the tumor was found covered with cauda equina nerve roots. We delineated the inferior pole of the tumor, followed by opening of the capsule and debulking the tumor. Subsequently, the cranial pole was dissected from the corresponding cauda equina nerve roots. Finally, the tumor nerve origin was identified and divided after nerve stimulation confirmed the tumor arose from a sensory nerve root. The tumor was removed; histological analysis revealed a schwannoma (WHO Grade I). Postoperative MRI revealed complete resection. The patient fully recovered her neurological function. This case highlights the importance of careful microsurgical technique and gross total resection of the tumor in the view of favorable postoperative neurological recovery of the patient. Intraoperative use of ultrasound is helpful to delineate preoperatively tumor extension and confirm postoperative tumor resection.

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