. The anatomy of the domestic animals. Veterinary anatomy. 876 THE SENSE ORGANS AND SKIN OF THE HORSE antl the greater part of tlie incus; (3) a relatively large ventral recess in the bulla ossea. The lateral, membranous wall (Paries membranacea) is formed largely by the thin membrana tympani, which closes the medial end of the external acoustic meatus, and thus forms the septum lietween the external and middle parts of the ear. The membrane is an oval disc, which slopes ventro-mcdially at an angle of about 30 degrees with the lower wall of the external acoustic meatus. The circumference is at
. The anatomy of the domestic animals. Veterinary anatomy. 876 THE SENSE ORGANS AND SKIN OF THE HORSE antl the greater part of tlie incus; (3) a relatively large ventral recess in the bulla ossea. The lateral, membranous wall (Paries membranacea) is formed largely by the thin membrana tympani, which closes the medial end of the external acoustic meatus, and thus forms the septum lietween the external and middle parts of the ear. The membrane is an oval disc, which slopes ventro-mcdially at an angle of about 30 degrees with the lower wall of the external acoustic meatus. The circumference is attached in a groove (Sulcus tympanicus) in the thin ring of bone (Annulus tympanicus) which almost completely surrounds it. The handle of the malleus (the outermost of the auditory ossicles) is attached to the inner surface of the membrane and draws the central part inward, producing a slight concavity of the outer surface. The periphery is thickened, forming the annulus fibrosus. The membrana tympani consists of three layers. The external cutaneous layer (Stratum cutaneum) is a prolongation of the lining of the external acoustic meatus. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia, London, W. B. Saunders Company
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