Anatomy and histology of the external ear in relation to the histogenesis of external otitis

Sophian, Lawrence H.

doi:10.1288/00005537-195409000-00003

Cited by 11 publications

(2 citation statements)

References 5 publications

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“…Prior reports have indicated that ceruminous glands increase in size and become hyperplastic, or cystic with the progression of chronic disease 7,9,10,12,13,15 . Cystic or hyperplastic ceruminous glands are generally thought to result from poor drainage from the glands by plugging of their ducts or increased fibrous tissue in skin 18,19 …”

Section: Discussionmentioning

confidence: 99%

Histological changes in the external ear canal of dogs with otitis externa

Huang

Little²,

McNeil

2009

Veterinary Dermatology

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This study aimed to better characterise the gross anatomy of the normal ear canal, and to compare histological features of the normal ear canal to those affected by chronic otitis externa. In 40 normal ears from 20 dogs, the length of the annular and auricular cartilage was 1.2 +/- 0.2 and 4.1 +/- 0.9 cm, respectively; overall length of the external ear canal was 5.3 +/- 1.0 cm. The maximal internal diameter at the distal end of the external ear canal, the proximal opening of the auricular cartilage and the proximal end of the annular cartilage was 5.8 +/- 1.5, 0.7 +/- 0.2 and 0.5 +/- 0.1 cm, respectively. Body weight correlated positively with the overall length and diameter of the distal end of the ear canal (r = 0.78, P < 0.001; r = 0.42, P < 0.05). Morphometric evaluation was carried in 28 clinically healthy ears of 14 dogs, and 15 otitic ears of 13 dogs. Histological features of this integument revealed that the density and distribution of sebaceous and ceruminous gland tissue exhibits marked variation between individuals. Nevertheless, general patterns were observed; sebaceous tissue increases gradually from the proximal to the distal parts of the ear canal, whilst ceruminous gland tissue by contrast decreases. In otitic canine ears, the distribution of sebaceous and ceruminous glandular tissue was similar to normal ears but the glands became larger and hyperplastic (P < 0.05). Density of hair follicles was not different between healthy and otitic ears (P = 0.16), but the hair follicles became hyperplastic in otitic ears.

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Section: Discussionmentioning

confidence: 99%

Histological changes in the external ear canal of dogs with otitis externa

Huang

Little²,

McNeil

2009

Veterinary Dermatology

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“…[6][7][8][9][10][11]. The endothelial cells were swollen and reduplicated so that the vascular lumina were reduced or actually occluded.…”

Section: Dermismentioning

confidence: 99%

XXXII The Pathology of Acute Diffuse External Otitis

Sophian¹

1955

Ann Otol Rhinol Laryngol

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Acute inflammations of the skin of the external auditory canal occur frequently in hot, humid environments and have been variously named diffuse external otitis/ furunculosis, fungous ear, desquamative otitis externa.f tropical otitis externa," and hot weather ear." Although much has been written regarding the clinical picture and the bacteriologic flora associated with this disease, the pathogenesis of this entity remains a matter of controversy in medical literature.As part of an integrated investigation of the etiology, pathology, and treatment of the external ear, a histopathologic study of the affected skin seemed desirable. To our knowledge biopsy material from acute cases of diffuse external otitis has in the past never been obtained, although an occasional report describing chronic changes in the periauricular area is available."On the basis of earlier and preliminary pathologic data, the following concept of the pathogenesis of acute diffuse external otitis was suggested by one of the authors." 7 As a result of persistent high temperature and humidity, and wetting of the skin by swimming or bathing, there is produced in certain susceptible individuals a thickening of the stratum corneum. This results in the plugging of pilosebaceous units and the skin of the ear canal is deprived of its normal oily water-repellent protective coating. If the hot, humid period continues, there develops a pre-inflammatory state consisting of an itchy, dry, scaly skin, devoid of sufficient surface lipids. Such dry skin is constantly irritated by rubbing, scratching, and the application of irritating medications. Under such conditions the ubiquitous

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External Otitis: A Method of Therapy and Prophylaxis

BRANCA

1956

Archives of Otolaryngology - Head and Neck Surgery

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Anatomy and histology of the external ear in relation to the histogenesis of external otitis

Cited by 11 publications

References 5 publications

Histological changes in the external ear canal of dogs with otitis externa

Histological changes in the external ear canal of dogs with otitis externa

XXXII The Pathology of Acute Diffuse External Otitis

External Otitis: A Method of Therapy and Prophylaxis

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