Anatomy Of Dog Ear Canal
Some species are devoid of hair in the lower proximal ear canal eg horse. The vertical canal runs ventrally and slightly rostrally before bending to a shorter horizontal canal that runs medially and forms the horizontal part of external ear canal.
Ear Structure And Function In Dogs Dog Owners Merck Veterinary Manual
The canine ear consists of the pinna external ear canal middle ear and inner ear.
Anatomy of dog ear canal. The pinna is shaped to capture sound waves and funnel them through the ear canal to the eardrum. The ear drum is very fragile and can be damaged by ear disease or during ear cleaning. The outer ear cannel is separated from the middle ear by a thin membrane called the eardrum or tympanic membrane.
Hair follicle density in the dog is variable usually simple but in some breeds compound hair follicles. These are the external middle and internal parts which are distributed with different anatomical features. The external ear canal in the dog is 5 to 10 cm long and 4 to 5 mm wide see figure 1 5.
Foreign bodies can become lodged in the external auditory meatus but glands are present that produce wax which can trap these. The ear canal is formed proximally near the skull by the annular cartilage and distally away from the skull by the auricular cartilage which fans out to form the pinna fig. Unlike humans that have a very short ear canal dogs have a long narrow ear canal that makes almost a 90 degree bend as it travels to the deeper parts of the ear.
The external ear is composed of auricular and annular cartilage. In chronic otitis the sebaceous glands become fewer than normal and the apocrine glands increase in number in size and in their production of secretions. The auricular cartilage of the pinna becomes funnel shaped at the opening of the external ear canal.
In dogs the pinnae are mobile and can move independently of each other. The outer and middle parts of the canine ear are specific for selection collection and maintaining pitch of all sound waves which enters the ear. Figure 13 auricular and annular cartilage of the right ear of a dog lateral view.
The ear canal consists of an initial vertical part which may extend an inch. Photo by phil snow utcvm c 2012 the university of tennessee. The ear flap funnels sound into the ear canal.
The ear canal is lined with both apocrine ceruminous and sebaceous glands which in the normal animal produce a protective coating of earwax cerumen. A dogs ear mainly has three parts which appears as a canal. The vertical ear canal runs for about 1 inch then.
The size and shape of the pinnae vary by breed. The outer ear includes the pinna the part you see that is made of cartilage and covered by skin fur or hair and the ear canal.
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