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Ventral horn Stock Photos and Images

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Ventral horn Stock Photos and Images

Human anatomy, including structure and development and practical considerations . page 1044), arises as the axonesof these neurones. The anterior reflex fibres to the ventral horn are all collaterals, not continu-ations of the stem-fibres, far the greater part of which come from the fibres of thelong ascending posterior tract. These collaterals penetrate the gray matter princi-pally at the median border of the head of the posterior horn, behind Clarkescolumn, but partly also through the substantia Rolandi, and thence pass ventrally orventro-laterally, with a slightly curved or sigmoid course, Stock Photo
RM2AWFX07–Human anatomy, including structure and development and practical considerations . page 1044), arises as the axonesof these neurones. The anterior reflex fibres to the ventral horn are all collaterals, not continu-ations of the stem-fibres, far the greater part of which come from the fibres of thelong ascending posterior tract. These collaterals penetrate the gray matter princi-pally at the median border of the head of the posterior horn, behind Clarkescolumn, but partly also through the substantia Rolandi, and thence pass ventrally orventro-laterally, with a slightly curved or sigmoid course,
A manual of anatomy . through the corona radiata intothe internal capsule occupying the middle portion thereof; they enterthe crusta of the crus cerebri, then the tegmentum of the pons andthe ventral area of the oblongata; in these three regions some of itsfibers pass to the cerebral nerve nuclei of origin. At the caudal endof the oblongata 85 to 90 per cent, of the fibers decussate to the op-posite side of the spinal cord as the crossed pyramidal tract and thenend at various levels around the cells of the ventral horn. Theremaining fibers continue down the same side of the spinal cord, asthe Stock Photo
RM2AXFNBK–A manual of anatomy . through the corona radiata intothe internal capsule occupying the middle portion thereof; they enterthe crusta of the crus cerebri, then the tegmentum of the pons andthe ventral area of the oblongata; in these three regions some of itsfibers pass to the cerebral nerve nuclei of origin. At the caudal endof the oblongata 85 to 90 per cent, of the fibers decussate to the op-posite side of the spinal cord as the crossed pyramidal tract and thenend at various levels around the cells of the ventral horn. Theremaining fibers continue down the same side of the spinal cord, asthe
A manual of anatomy . vide intoascending and descending fibers. The ascending pass to the nucleigracilis and cuneatus and give off collaterals at various levels. Thedescending fibers end at various segments in the dorsal horn and newfibers arise from the cells here to pass to the ventral horn of the sameand opposite sides. New impulses arise from the motor cells hereand are conveyed to the muscles. (2) An indirect reflex path is as follows: First neuron, from the peri- 420 THE NERVE SYSTEM phery to the nuclei cuneatus and gracilis through the dorsal columnof the spinal cord. Second neuron, fro Stock Photo
RM2AXFN1H–A manual of anatomy . vide intoascending and descending fibers. The ascending pass to the nucleigracilis and cuneatus and give off collaterals at various levels. Thedescending fibers end at various segments in the dorsal horn and newfibers arise from the cells here to pass to the ventral horn of the sameand opposite sides. New impulses arise from the motor cells hereand are conveyed to the muscles. (2) An indirect reflex path is as follows: First neuron, from the peri- 420 THE NERVE SYSTEM phery to the nuclei cuneatus and gracilis through the dorsal columnof the spinal cord. Second neuron, fro
A manual of anatomy . e cord. 2. The direct pyramidal tract {fasciculus cerebrospinalis anterior)lies lateral to the preceding and consists of descending fibers from themotor cells of the cerebral cortex. It represents undecussatedfibers (10 to 15 per cent.) of the oblongata but they ultimately crossto the opposite ventral horn through the white commissure at vari- THE SPINAL CORD 367 ous levels. It does not extend below the midthoracic segments ofthe cord. 3. The vestibulospinal tract {fas. vestibidospinalis) consists ofdescending fibers from the vestibular nuclei of the brain stem, thatend i Stock Photo
RM2AXG976–A manual of anatomy . e cord. 2. The direct pyramidal tract {fasciculus cerebrospinalis anterior)lies lateral to the preceding and consists of descending fibers from themotor cells of the cerebral cortex. It represents undecussatedfibers (10 to 15 per cent.) of the oblongata but they ultimately crossto the opposite ventral horn through the white commissure at vari- THE SPINAL CORD 367 ous levels. It does not extend below the midthoracic segments ofthe cord. 3. The vestibulospinal tract {fas. vestibidospinalis) consists ofdescending fibers from the vestibular nuclei of the brain stem, thatend i
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Fig. 86.3.—Two Motor Neurones from the Ventral Horn ofthe Thoracic Spinal Cord of a Rabbit, Fifteen Days after cuttingthe Major Sacro-Sciatic Xerve, to Illustrate the Chromatolysis ofthe Xissl Substance During the Axonal Degeneration. .4,Cell in which the chromophilic bodies are partially disintegrated(at 6) and the nucleus eccentric; B, cell showing more advancedchromatolysis (c), the chromophilic substance being present onlyin the dendrites and around the nucleus Stock Photo
RM2AKCF0C–A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Fig. 86.3.—Two Motor Neurones from the Ventral Horn ofthe Thoracic Spinal Cord of a Rabbit, Fifteen Days after cuttingthe Major Sacro-Sciatic Xerve, to Illustrate the Chromatolysis ofthe Xissl Substance During the Axonal Degeneration. .4,Cell in which the chromophilic bodies are partially disintegrated(at 6) and the nucleus eccentric; B, cell showing more advancedchromatolysis (c), the chromophilic substance being present onlyin the dendrites and around the nucleus
The educational meaning of manual arts and industries . Fig. 4.—Isolated body of a large cell from the ventral horn ofthe spinal cord. Human, X 200 diameters. (Obersteiner.)A, neuron; D, dendrons; N, nucleus with* enclosures; P,pigment spot. In the central system these prolongations extend from the cortex of the cerebrum to the lumbar en PHYSICAL AND PHYSIOLOGICAL RESULTS 121 largements of the cord, and in the peripheral systemthey reach from their point of origin in the cord tothe most distant portions of the extremities. In eachinstance the fiber is a continuous growth of the cellbody. Thus Stock Photo
RM2AN9DDG–The educational meaning of manual arts and industries . Fig. 4.—Isolated body of a large cell from the ventral horn ofthe spinal cord. Human, X 200 diameters. (Obersteiner.)A, neuron; D, dendrons; N, nucleus with* enclosures; P,pigment spot. In the central system these prolongations extend from the cortex of the cerebrum to the lumbar en PHYSICAL AND PHYSIOLOGICAL RESULTS 121 largements of the cord, and in the peripheral systemthey reach from their point of origin in the cord tothe most distant portions of the extremities. In eachinstance the fiber is a continuous growth of the cellbody. Thus
Human anatomy, including structure and development and practical considerations . plane, but overlie one another tosome extent, so that each group occupies a crescentic area, whose greatest width cor-responds in a general way with that of the subjacent ventral horn of gray matter.The anterior root-line, which lies from 2-4 mm. lateral to the median fissure, isneither indicated by adistinct furrow nor con-tinuous. In this manner twolongitudinal tracts, theposterior columns(funiculi posteriores) aremarked off betweenthe posterior medianseptum and the sulciof the posterior root-lines. These colum Stock Photo
RM2AWG3XX–Human anatomy, including structure and development and practical considerations . plane, but overlie one another tosome extent, so that each group occupies a crescentic area, whose greatest width cor-responds in a general way with that of the subjacent ventral horn of gray matter.The anterior root-line, which lies from 2-4 mm. lateral to the median fissure, isneither indicated by adistinct furrow nor con-tinuous. In this manner twolongitudinal tracts, theposterior columns(funiculi posteriores) aremarked off betweenthe posterior medianseptum and the sulciof the posterior root-lines. These colum
An American text-book of physiology . Cellswith one neuron are called raononeuric. Cells with two neurons, dineuric.The neuron, in many cases, has branches, both near its origin from the cell-body and also along its course. These branches are designated as coUatei-als.Contrasted with this principal outgrowth are the other branches of the cell,. Fig. 143.—a group of human nerve-cell bodies, drawn to scale ; X 200 diameters : A, cell-body fromthe ventral horn of the spinal cord, longitudinal section; C, the same, transverse section; B, cell fromthe third layer of cerebral cortex; D, cell from th Stock Photo
RM2AJEB39–An American text-book of physiology . Cellswith one neuron are called raononeuric. Cells with two neurons, dineuric.The neuron, in many cases, has branches, both near its origin from the cell-body and also along its course. These branches are designated as coUatei-als.Contrasted with this principal outgrowth are the other branches of the cell,. Fig. 143.—a group of human nerve-cell bodies, drawn to scale ; X 200 diameters : A, cell-body fromthe ventral horn of the spinal cord, longitudinal section; C, the same, transverse section; B, cell fromthe third layer of cerebral cortex; D, cell from th
The anatomy of the nervous system, from the standpoint of development and function . the sheep to show the lateral ventricle and thestructures which form its floor. Dorsal view. the more dorsal one is known as the bull of the posterior horn (bulbus cornu),and is formed by the occipital portion of the radiation of the corpus callosumor forceps major. The other elevation, known as the ealcar avis, is larger andis produced by the rostral part of the calcarine fissure, which here causes a fold-ing of the entire thickness of the pallium (p. 238). The inferior horn, or cornu inferius, curves ventral Stock Photo
RM2AWF7N0–The anatomy of the nervous system, from the standpoint of development and function . the sheep to show the lateral ventricle and thestructures which form its floor. Dorsal view. the more dorsal one is known as the bull of the posterior horn (bulbus cornu),and is formed by the occipital portion of the radiation of the corpus callosumor forceps major. The other elevation, known as the ealcar avis, is larger andis produced by the rostral part of the calcarine fissure, which here causes a fold-ing of the entire thickness of the pallium (p. 238). The inferior horn, or cornu inferius, curves ventral
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . 435 ligula : /, mentum ; g, prosternum, front, and /<, side view ; ?,under side of the rest of the body, showing the six ventral seg-ments of the abdomen ; J, anterior tarsus : from Horn) foundin Northern California, is the sole representative of this familyand differs from the preceding family in the metasternum be- /- d i i. Fig. 379. ing truncate behind, and not reaching the abdomen. A. inso/(-//.s- Lee. is an anomalous form, being subaquat Stock Photo
RM2AJ3E5G–Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . 435 ligula : /, mentum ; g, prosternum, front, and /<, side view ; ?,under side of the rest of the body, showing the six ventral seg-ments of the abdomen ; J, anterior tarsus : from Horn) foundin Northern California, is the sole representative of this familyand differs from the preceding family in the metasternum be- /- d i i. Fig. 379. ing truncate behind, and not reaching the abdomen. A. inso/(-//.s- Lee. is an anomalous form, being subaquat
Human anatomy, including structure and development and practical considerations . ngular bundle of Gombault andPhilippe. Additional descending endogenous fibres are scattered in the ventral field. It is WHITE MATT1:R of the SriNAL CORD. 1043 likely that these areas lepreseiU tlie principal aggregations of the downward coursing limbs ofthe axoiies, after their T-like branching, derived from ihe posterior horn cells of the same andopiKisite sides. In the cervical region these axones are col- FiG. 897. lected intt) bnndles which ap-pear as the conuna tract ; inthe lower thoracic cord theseare rep Stock Photo
RM2AWFWKC–Human anatomy, including structure and development and practical considerations . ngular bundle of Gombault andPhilippe. Additional descending endogenous fibres are scattered in the ventral field. It is WHITE MATT1:R of the SriNAL CORD. 1043 likely that these areas lepreseiU tlie principal aggregations of the downward coursing limbs ofthe axoiies, after their T-like branching, derived from ihe posterior horn cells of the same andopiKisite sides. In the cervical region these axones are col- FiG. 897. lected intt) bnndles which ap-pear as the conuna tract ; inthe lower thoracic cord theseare rep
Human anatomy, including structure and development and practical considerations . Dorsal zone Dorsalroot-fibres Neuroblasts. ? Floor-plate Floor-plate Ventral root-fibres Developing spinal cord of about fourweeks. X 100. (His.) Developing spinal cord of about five weeks.X 60. (His.) ward with corresponding increase in the width of the entire ventral part of the cord, which isnow broadest in front. Within this thickened ventro-lateral part of the nuclear layer, later theanterior horn of gray matter, as early as the fourth week young neurones are seen from whichaxones grow outward through the ma Stock Photo
RM2AWFRYA–Human anatomy, including structure and development and practical considerations . Dorsal zone Dorsalroot-fibres Neuroblasts. ? Floor-plate Floor-plate Ventral root-fibres Developing spinal cord of about fourweeks. X 100. (His.) Developing spinal cord of about five weeks.X 60. (His.) ward with corresponding increase in the width of the entire ventral part of the cord, which isnow broadest in front. Within this thickened ventro-lateral part of the nuclear layer, later theanterior horn of gray matter, as early as the fourth week young neurones are seen from whichaxones grow outward through the ma
Organic and functional nervous diseases; a text-book of neurology . Neurones, 1, anterior horn of sjiinal cord; 2, optic thaluiniis; 3, posterior spinal ganglion (chickembryo); 4, cerebellum ; 5, cerebral cortex, surface layer. 24 THE STRUCTURE OF THE NERVOUS SYSTEM. Fig. 2.. Large pluripolar ganglion cell of the ventral paramedian field of the abdominal cord of Lvmbriciis.A primitive fibril is seen on its way to a ganglion cell becoming thinner, owing to the emission of theside fibrils. A very complicated intracellular reticulum of neuro-fibrils is to be made out in the forma-tion of which th Stock Photo
RM2AN5D63–Organic and functional nervous diseases; a text-book of neurology . Neurones, 1, anterior horn of sjiinal cord; 2, optic thaluiniis; 3, posterior spinal ganglion (chickembryo); 4, cerebellum ; 5, cerebral cortex, surface layer. 24 THE STRUCTURE OF THE NERVOUS SYSTEM. Fig. 2.. Large pluripolar ganglion cell of the ventral paramedian field of the abdominal cord of Lvmbriciis.A primitive fibril is seen on its way to a ganglion cell becoming thinner, owing to the emission of theside fibrils. A very complicated intracellular reticulum of neuro-fibrils is to be made out in the forma-tion of which th
Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . Fig. 221. —Chryso-bothris trinervia.—From Packard. Fig. 222.—Chi-ysobothris triner-via ; a, head seen in front; b,last male ventral segment;c, do. female; d, first leg ofmale.—After Horn. As this beetle occurs in the pine forests of Colorado, it is most prob-able that it bores in pine trees. It is a rather small, short, broadspecies, dull blackish, with faint metallic reflections. Surface of thebody, especially the wing-covers, with Stock Photo
RM2AX32DM–Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . Fig. 221. —Chryso-bothris trinervia.—From Packard. Fig. 222.—Chi-ysobothris triner-via ; a, head seen in front; b,last male ventral segment;c, do. female; d, first leg ofmale.—After Horn. As this beetle occurs in the pine forests of Colorado, it is most prob-able that it bores in pine trees. It is a rather small, short, broadspecies, dull blackish, with faint metallic reflections. Surface of thebody, especially the wing-covers, with
The green June beetle [Cotinis nitida L.] . .1. Green June Beetle. A, Pupal cells; B, same showing exit holes of beetle. About natural size. THK GREEN ,TTTNE BEETLE. 5 green on the dorsal surface, with the niar<i;ins orange yeUow, thislatter color fre<iiiently extending to other portions of the elytra orwing-covers. The ventral or lower surface is shining green andorange yellow. The thorax is subtriangular and the head is armedwith a horn-like i)rocess or clypeal horn which is more prominent inthe male. The shape and size of this clypeal horn vary. The lengthof the beetle is from three-f Stock Photo
RM2AN2NPB–The green June beetle [Cotinis nitida L.] . .1. Green June Beetle. A, Pupal cells; B, same showing exit holes of beetle. About natural size. THK GREEN ,TTTNE BEETLE. 5 green on the dorsal surface, with the niar<i;ins orange yeUow, thislatter color fre<iiiently extending to other portions of the elytra orwing-covers. The ventral or lower surface is shining green andorange yellow. The thorax is subtriangular and the head is armedwith a horn-like i)rocess or clypeal horn which is more prominent inthe male. The shape and size of this clypeal horn vary. The lengthof the beetle is from three-f
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . >.o o ^E X 1 IT) < N H X(u N .Sc/5 J 00-OS ^ ,-( ll •-. o 278 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 24. Forresteria (Forresteria) alluaudi (Boule, Lemoine & Thevenin, 1907). A-B. SAS Z949. C-D. SASH196/2. All xl. CRETACEOUS FAUNAS FROM SOUTH AFRICA 279 F. (F.) alluaudi in developing massive pinched lateral horns that bear loopedribs connecting to ventral clavi and lacks an umbilical bulla (whether thelateral horn develops from the fusion of an umbilical bulla and lateral tubercleon the inner whorls or represe Stock Photo
RM2AM3A55–Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . >.o o ^E X 1 IT) < N H X(u N .Sc/5 J 00-OS ^ ,-( ll •-. o 278 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 24. Forresteria (Forresteria) alluaudi (Boule, Lemoine & Thevenin, 1907). A-B. SAS Z949. C-D. SASH196/2. All xl. CRETACEOUS FAUNAS FROM SOUTH AFRICA 279 F. (F.) alluaudi in developing massive pinched lateral horns that bear loopedribs connecting to ventral clavi and lacks an umbilical bulla (whether thelateral horn develops from the fusion of an umbilical bulla and lateral tubercleon the inner whorls or represe
. SkogsvÃ¥rdsföreningens tidskrift. a b c Fig. 20. (iranfrögallmyggan (/c/-;-/5/« j/roZi/WlNX.) fl, puppan, frÃ¥n buksidan; Z», antennslidor-nas bas, med hjässutskotten, frÃ¥n ryggsidan; c, desamma frÃ¥n buksidan; J, toracalpa])iller; e, toracalstigma. â a, pupa, ventral aspect; /5, baf^e of the antennal cascs withthe cervical processes, dorsal aspect: c, sarae, ventral aspect: ii, thoracic papill.-e; e, thoracic stigma. Toracalstigmata äro utbildade som lÃ¥nga, sakta mot spetsen avsmal-nande och svagt böjda horn (fig. 20 e), vilka pÃ¥ den ventrala sidan genom-dragas av en traké, ilke Stock Photo
RM2AFRNR6–. SkogsvÃ¥rdsföreningens tidskrift. a b c Fig. 20. (iranfrögallmyggan (/c/-;-/5/« j/roZi/WlNX.) fl, puppan, frÃ¥n buksidan; Z», antennslidor-nas bas, med hjässutskotten, frÃ¥n ryggsidan; c, desamma frÃ¥n buksidan; J, toracalpa])iller; e, toracalstigma. â a, pupa, ventral aspect; /5, baf^e of the antennal cascs withthe cervical processes, dorsal aspect: c, sarae, ventral aspect: ii, thoracic papill.-e; e, thoracic stigma. Toracalstigmata äro utbildade som lÃ¥nga, sakta mot spetsen avsmal-nande och svagt böjda horn (fig. 20 e), vilka pÃ¥ den ventrala sidan genom-dragas av en traké, ilke
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