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Guttural pouch

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17: 336:. Diagnosis is achieved through radiography and endoscopic evaluation. The specific cause of guttural pouch tympany is not known, but it is suspected that it is more common when there are defects of the plica salpingopharyngeus, and/or the pharyngeal orifice where they act as a one-way valve that does not allow air to escape. Because of the risk of secondary infection, it is crucial that tympany be treated as soon as possible. Treatment protocols may include, but are not limited to, surgical intervention and in cases where surgery is not an option, insertion of a transnasal 210:
outwards, forming two types of vascular plexuses surrounding the internal carotid arteries: one with capillary bundles parallel to the internal carotid arteries in the outer layer of the tunica adventitia (outer peri-arterial plexus) and the other with vein-artery-vein triads within the inner layer of the tunica adventitia (inner peri-arterial plexus). These guttural pouch microvascular plexuses, engulfing the internal carotid arteries, are typical of
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that occurs during heavy exercise. However, this proven function has been called into question by another study that neither examined the guttural pouches nor the internal carotid arteries; and others have argued that a cooling function would require an unattainable high rate of inspiratory air flow
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infections can also occur. Some visible symptoms of guttural pouch disease include abnormal head and neck carriage, nasal discharge, painful swelling and occasional abnormal functioning of the structures associated with the pouch. Secondary problems may include inflammation of the middle ear due to
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Guttural pouch tympany is an uncommon ailment in which excessive amounts of air become trapped in the pouch, resulting in abnormal expansion. Tympany is usually unilateral, but in some cases can affect both pouches. It is seen most often in young foals and is more common in females than in males.
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The issue of necessary guttural pouch air flow rates, to provide rapid cooling of the internal carotid arteries, has been solved by further supporting evidence from microvascular studies of the guttural pouch mucosa. Many of the guttural pouch mucosal superficial arterioles and capillaries extend
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The function of the guttural pouches has been shown with experimental data to participate in the rapid cooling of arterial blood destined for the brain and surrounding structures. In other words, the horse's guttural pouches are 'brain-cooling devices', cooling blood within the internal carotid
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repeatedly until the exudate drains. Antimicrobial therapy without a lavage seldom remedies the infection. In more complex cases, where concretions have formed, surgical intervention may be necessary to ensure appropriate drainage and removal of the hardened material. The area can be accessed
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a mucosal fold at the caudal portion of the Eustachian tube, forms an uninterrupted channel between the medial lamina of the Eustachian tube and the lateral wall of the pharynx. The plica salpingopharyngea can sometimes act as a one-way valve trapping air in the pouch, causing
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heat exchangers surrounding internal carotid arteries, and finally afterwards where the internal carotid arteries project upwards passing through the intracranial cavernous venous sinuses accepting cooled venous blood from the nasal sinuses.
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and mucosa, they have the potential to be affected by all respiratory pathogens. Most infections are self-limiting, requiring no or little medical intervention. Upon endoscopy, affected guttural pouches often house
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currently and no predisposing factors have been identified. Fungal plaque is usually located in the medial guttural pouch, near the internal carotid artery. Clinical signs include unilateral or bilateral
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Perkins, Justin D.; Schumacher, Jim; Kelly, Ger; Gomez, Jorge H.; Schumacher, John (2006-10-01). "Standing surgical removal of inspissated guttural pouch exudate (chondroids) in ten horses".
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of the area will show an opaque fluid line in the pouch and if a retropharyngeal lymph node is involved, it may reveal a mass. In mild, acute cases of empyema, a saline or polyionic solution
63:. The condition predisposes young horses to infection, often including severe swelling and often requires surgery to correct. The guttural pouch is also the site of infection in equine 106:
The guttural pouches connect the middle ear to the pharynx. The opening into the pharynx is called the nasopharyngeal ostium, which is composed of the pharyngeal wall laterally and a
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Each pouch is moulded around the stylohyoid bone which divides the medial and lateral compartments. The medial compartment is much larger, and protrudes more caudally and ventrally.
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Tympany results in non-painful, soft swelling beneath the ear and behind the jaw. Additional symptoms may include roaring, difficulty breathing, and difficulty swallowing and/or
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If the drainage tract becomes blocked for any reason, the mucous secretions can accumulate and cause the pouch to distend, producing a visible and palpable protrusion behind the
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heat exchangers recognised in other animal species, supporting the data that guttural pouches participate in selective brain cooling, even at lower air flow rates.
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Caston, S. S.; Kersh, K. D.; Reinertson, E. L.; Cammack, S. (2015-01-01). "Treatment of guttural pouch tympany in foals with transnasal Foley catheter placement".
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Shane K. Maloney; Andrea Fuller; Graham Mitchell; Duncan Mitchell (March 2002). "On the guttural pouch and selective brain cooling in equids: research letter".
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migration of the infection along the auditory tube; nasal bleeding caused by damage to the internal carotid artery; with vagus nerve involvement there may be
221:. The triad including the function of guttural pouches achieving arterial cooling, via both by utilizing inspiratory air cooling as well as microvascular 303:
in the pharyngeal orifices of the pouches. The infection can also be due to the rupture of the nearby retropharyngeal lymph nodes, usually caused by an
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passes ventral to the medial compartment before crossing to the lateral wall of the lateral compartment. The pouch also covers the temporohyoid joint.
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Guttural pouch empyema is characterized by the accretion of purulent, bacteria infested exudate in the pouch. The bacteria is primarily
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due to erosion of the artery walls, nasal discharge and cranial nerve dysfunction. GPM is a dangerous condition as spontaneous fatal
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displacement may or may not be seen. Empyema is often secondary to guttural pouch tympany (distention of the pouches with air) in
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fold medially. This opening leads to a short soft tissue passageway into the respective guttural pouch. The openings are located
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can occur, usually within a few days to weeks after the first bout of epistaxis. The most common fungus associated with GPM is
144:; lymph nodules are also present. The compartments of each guttural pouch contain many important structures including several 100: 1068: 1015: 872: 111: 610:
Baptiste, Keith E.; Naylor, Jonathan M.; Bailey, Jeremy; Barber, Ernest M.; Post, Klass; Thornhill, Jim (2000-02-01).
92: 40:, and the American forest mouse. They are paired bilaterally just below the ears, behind the skull and connect to the 348:
Guttural pouch mycosis (GPM) is a fungal disease that is rare but potentially life-threatening. GPM is of unknown
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affected arteries. Early intervention is necessary to ensure the best chance of survival. Horses that experience
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Diagnosis is made based on the history of the animal, presenting clinical signs and endoscopic exploration.
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The guttural pouches are located behind the cranial cavity, caudally the skull and below the wings of the
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Mitchell, Graham; Fuller, Andrea; Maloney, Shane K; Rump, Nicola; Mitchell, Duncan (2006-09-22).
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This completes the triad of internal carotid artery cooling that protects the horse's brain from
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Due to the general inaccessibility of the pouches in horses, they can be an area of infection by
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is not suggested without coinciding surgery. Treatment typically consists of topical as well as
502:"The equine guttural pouch: Clinically relevant anatomy and basic treatment options for trauma" 1271: 1251: 1232: 1188: 1163: 1128: 1110: 1074: 1021: 996: 988: 905: 850: 743: 694: 647: 639: 576: 419: 169: 165: 95:
located between the ventral wall and pharynx. The left and right pouches are separated by the
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muscles dorsomedially. Below these muscles, the two pouches fuse to form a median septum.
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muscles. The ventral portion lies on the pharynx and beginning of the esophagus, with the
25: 539:"Diagnosing Guttural Pouch Disorders and Managing Guttural Pouch Empyema in Adult Horses" 252: 627: 1123: 1098: 738: 713: 409: 337: 145: 107: 84: 76: 1228: 690: 114:
to enable drainage of mucus when the head is lowered and prevent fluid build-up. The
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from the involvement of sympathetic nerves. Involvement of the facial nerve is rare.
255:(roaring) or difficulty swallowing (also if glossopharyngeal nerve is involved); and 80: 60: 48: 1283: 831:"Selective brain cooling in the horse during exercise and environmental heat stress" 815: 611: 1212: 659: 379: 349: 218: 202: 185: 180:
all cause a mucosal fold indent within the medial compartment, visible when viewed
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Dobesova, O.; Schwarz, B.; Velde, K.; Jahn, P.; Zert, Z.; Bezdekova, B. (2012).
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and arteries that lie directly against the pouch as they pass into and out of
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Pollock, P. J. (2007). "Diagnosis and management of guttural pouch mycosis".
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Perkins, Gillian A.; Pease, Anthony; Crotty, Erin; Fubini, Susan L. (2003).
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diverticula that contain between 300 and 600 ml of air. They are present in
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or other forms of nerve dysfunction as a result of GPM have a poorer
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Lavoie, Jean-Pierre; Hinchcliff, Kenneth William (2008-01-01).
477:"Guttural Pouches - Anatomy & Physiology - WikiVet English" 33: 310:
Diagnosis is established through and endoscopic examination.
873:"Equine guttural pouch empyema, why does it become chronic?" 714:"Guttural pouches, brain temperature and exercise in horses" 612:"Physiology - A function for guttural pouches in the horse" 1067:
Robinson, Norman Edward; Sprayberry, Kim A. (2009-01-01).
246:, the causative agent of strangles, is commonly involved. 1213:"The mystery of fungal infection in the guttural pouches" 378:
antifungal medication, paired with surgery to occlude or
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FF McConaghy; JR Hales; RJ Rose; DR Hodgson (Dec 1995).
575:. St. Louis, Missouri: Elsevier Inc. pp. 522–525. 571:
Dyce, Keith, M.; Wesing, C. J. G.; Sack, W. O. (2010).
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Ninomiya, Hiroyoshi; Kuwano, Atsutoshi (March 2019).
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may become contaminated with pathogens. The bacteria
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is in contact with the dorsal part of the pouch. The
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Lepage, O. M.; Perron, M. F.; CadorΓ©, J. L. (2004).
1299:"Fungal Infections of the Guttural Pouch in Horses" 1017:Blackwell's Five-Minute Veterinary Consult: Equine 390:that those who have not exhibited those symptoms. 901:20.500.11820/02506108-4e72-4a2b-96fe-91637419cb5f 340:in an attempt to remodel the pharyngeal orifice. 1046:Fjeldborg, J.; Baptiste, Keith (2017-01-03). 8: 956:: CS1 maint: multiple names: authors list ( 595:: CS1 maint: multiple names: authors list ( 206:partly diverted into the guttural pouches. 323:surgically through the Viborg's triangle. 1122: 899: 871:Dixon, P. M.; James, O. A. (2016-12-01). 774: 737: 140:and ciliated containing mucus-secreting 1297:Kentucky Equine Research Staff (2013). 435: 318:is often performed via an endoscope or 262:As the guttural pouches are covered by 152:in the caudal aspect of the skull. The 1206: 1204: 1184:Clinical Veterinary Advisor: The Horse 949: 588: 59:affects several breeds, including the 1311:– via Kentucky Equine Research. 1092: 1090: 1062: 1060: 1041: 1039: 1037: 931: 929: 927: 925: 923: 921: 919: 866: 864: 7: 1053:. University of Copenhagen, Denmark. 946:– via Merck Veterinary Manual. 796:Journal of Equine Veterinary Science 566: 564: 562: 560: 558: 556: 532: 530: 471: 469: 441: 439: 271:that is in the process of draining. 1070:Current Therapy in Equine Medicine 1048:"Diseases of the Guttural Pouches" 938:"Guttural Pouch Disease in Horses" 14: 985:10.1111/j.1532-950X.2006.00204.x 763:South African Journal of Science 1103:The Canadian Veterinary Journal 79:(C1). They are enclosed by the 573:Textbook of Veterinary Anatomy 1: 1229:10.1016/s1090-0233(03)00108-4 835:Journal of Applied Physiology 691:10.1016/S1090-0233(98)80009-9 1187:. Elsevier Health Sciences. 1181:Wilson, David (2010-11-28). 1073:. Elsevier Health Sciences. 847:10.1152/jappl.1995.79.6.1849 24:Guttural pouches are large, 20:Guttural pouch (labelled 97) 1148:Equine Veterinary Education 880:Equine Veterinary Education 673:Baptiste, Keith E. (1998). 509:Equine Veterinary Education 448:Equine Veterinary Education 93:retropharyngeal lymph nodes 1369: 1239:– via Research Gate. 1097:Bell, Chris (2017-01-11). 808:10.1016/j.jevs.2018.12.025 85:mandibular salivary glands 1020:. John Wiley & Sons. 500:Davis, J. Weston (2015). 405:Equine respiratory system 174:cranial cervical ganglion 460:10.2746/095777307X240162 372:Pharmaceutical treatment 312:Radiographic examination 101:rectus capitis ventralis 190:external carotid artery 117:plica salpingopharyngea 1217:The Veterinary Journal 730:10.1098/rsbl.2006.0469 679:The Veterinary Journal 344:Guttural Pouch Mycosis 338:Foley balloon catheter 327:Guttural Pouch Tympany 275:Guttural Pouch Empyema 264:respiratory epithelium 124:guttural pouch tympany 57:guttural pouch tympany 21: 19: 334:aspiration pneumonia 253:laryngeal hemiplegia 628:2000Natur.403..382B 973:Veterinary Surgery 281:Streptococcus equi 269:mucopurulent fluid 244:Streptococcus equi 108:fibrocartilaginous 22: 1268:10.1136/vr.100700 1256:Veterinary Record 1160:10.1111/eve.12244 936:Rush, Bonnie, R. 892:10.1111/eve.12707 622:(6768): 382–383. 582:978-1-4160-6607-1 523:– via AAEP. 521:10.1111/eve.12399 301:congenital defect 257:Horner's syndrome 172:leaving from the 170:sympathetic trunk 1360: 1313: 1312: 1310: 1309: 1294: 1288: 1287: 1247: 1241: 1240: 1208: 1199: 1198: 1178: 1172: 1171: 1143: 1137: 1136: 1126: 1094: 1085: 1084: 1064: 1055: 1054: 1052: 1043: 1032: 1031: 1011: 1005: 1004: 968: 962: 961: 955: 947: 945: 944: 933: 914: 913: 903: 877: 868: 859: 858: 841:(6): 1849–1854. 826: 820: 819: 787: 781: 780: 778: 758: 752: 751: 741: 709: 703: 702: 670: 664: 663: 636:10.1038/35000284 607: 601: 600: 594: 586: 568: 551: 550: 534: 525: 524: 506: 497: 491: 490: 488: 487: 473: 464: 463: 443: 425:Circle of Willis 201:arteries during 178:internal carotid 154:glossopharyngeal 138:pseudostratified 30:odd-toed mammals 1368: 1367: 1363: 1362: 1361: 1359: 1358: 1357: 1348:Mammal diseases 1318: 1317: 1316: 1307: 1305: 1296: 1295: 1291: 1249: 1248: 1244: 1210: 1209: 1202: 1195: 1180: 1179: 1175: 1145: 1144: 1140: 1096: 1095: 1088: 1081: 1066: 1065: 1058: 1050: 1045: 1044: 1035: 1028: 1013: 1012: 1008: 970: 969: 965: 948: 942: 940: 935: 934: 917: 875: 870: 869: 862: 828: 827: 823: 789: 788: 784: 760: 759: 755: 718:Biology Letters 711: 710: 706: 672: 671: 667: 609: 608: 604: 587: 583: 570: 569: 554: 536: 535: 528: 504: 499: 498: 494: 485: 483: 475: 474: 467: 454:(10): 522–527. 445: 444: 437: 433: 396: 346: 329: 277: 232: 198: 73: 12: 11: 5: 1366: 1364: 1356: 1355: 1353:Horse diseases 1350: 1345: 1340: 1338:Animal anatomy 1335: 1330: 1320: 1319: 1315: 1314: 1289: 1242: 1200: 1194:978-1437714494 1193: 1173: 1138: 1109:(2): 192–194. 1086: 1080:978-1416054757 1079: 1056: 1033: 1026: 1006: 979:(7): 658–662. 963: 915: 860: 821: 782: 776:10520/EJC97450 753: 724:(3): 475–477. 704: 685:(2): 139–148. 665: 602: 581: 552: 526: 515:(8): 403–404. 492: 481:en.wikivet.net 465: 434: 432: 429: 428: 427: 422: 420:Perissodactyls 417: 412: 410:Cranial nerves 407: 402: 395: 392: 345: 342: 328: 325: 276: 273: 231: 228: 223:countercurrent 212:countercurrent 197: 194: 182:endoscopically 146:cranial nerves 97:longus capitis 72: 69: 13: 10: 9: 6: 4: 3: 2: 1365: 1354: 1351: 1349: 1346: 1344: 1343:Horse anatomy 1341: 1339: 1336: 1334: 1331: 1329: 1326: 1325: 1323: 1304: 1300: 1293: 1290: 1285: 1281: 1277: 1273: 1269: 1265: 1261: 1257: 1253: 1246: 1243: 1238: 1234: 1230: 1226: 1222: 1218: 1214: 1207: 1205: 1201: 1196: 1190: 1186: 1185: 1177: 1174: 1169: 1165: 1161: 1157: 1153: 1149: 1142: 1139: 1134: 1130: 1125: 1120: 1116: 1112: 1108: 1104: 1100: 1093: 1091: 1087: 1082: 1076: 1072: 1071: 1063: 1061: 1057: 1049: 1042: 1040: 1038: 1034: 1029: 1027:9780813814872 1023: 1019: 1018: 1010: 1007: 1002: 998: 994: 990: 986: 982: 978: 974: 967: 964: 959: 953: 939: 932: 930: 928: 926: 924: 922: 920: 916: 911: 907: 902: 897: 893: 889: 885: 881: 874: 867: 865: 861: 856: 852: 848: 844: 840: 836: 832: 825: 822: 817: 813: 809: 805: 801: 797: 793: 786: 783: 777: 772: 768: 764: 757: 754: 749: 745: 740: 735: 731: 727: 723: 719: 715: 708: 705: 700: 696: 692: 688: 684: 680: 676: 669: 666: 661: 657: 653: 649: 645: 641: 637: 633: 629: 625: 621: 617: 613: 606: 603: 598: 592: 584: 578: 574: 567: 565: 563: 561: 559: 557: 553: 548: 544: 540: 533: 531: 527: 522: 518: 514: 510: 503: 496: 493: 482: 478: 472: 470: 466: 461: 457: 453: 449: 442: 440: 436: 430: 426: 423: 421: 418: 416: 413: 411: 408: 406: 403: 401: 400:Arabian horse 398: 397: 393: 391: 389: 385: 381: 377: 373: 368: 366: 365: 364:Aspergillosis 360: 356: 351: 343: 341: 339: 335: 326: 324: 321: 317: 313: 308: 306: 302: 298: 294: 290: 286: 282: 274: 272: 270: 265: 260: 258: 254: 249: 245: 241: 237: 229: 227: 224: 220: 215: 213: 207: 204: 195: 193: 191: 187: 183: 179: 175: 171: 167: 163: 159: 155: 151: 147: 143: 139: 135: 130: 128: 125: 120: 118: 113: 109: 104: 102: 98: 94: 90: 86: 82: 78: 70: 68: 66: 62: 61:Arabian horse 58: 54: 50: 45: 43: 39: 35: 31: 27: 26:auditory-tube 18: 1306:. 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Index


auditory-tube
odd-toed mammals
bats
hyraxes
nasopharynx
fungi
bacteria
Arabian horse
strangles
atlas
parotid
mandibular salivary glands
pterygoid
retropharyngeal lymph nodes
longus capitis
rectus capitis ventralis
fibrocartilaginous
rostrally
plica salpingopharyngea
epithelium
pseudostratified
goblet cells
cranial nerves
foramina
glossopharyngeal
vagus
accessory
hypoglossal
sympathetic trunk

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