Paper - The early embryology of the auditory ossicles in man
Embryology - 25 Apr 2024 Expand to Translate |
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Hanson JR. Anson BJ. and Bast TH. The early embryology of the auditory ossicles in man. (1959) Q Bull Northwest Univ Med Sch. 33: 358-379. PMID: 14399619
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The Early Embryology of the Auditory Ossicles in Man
Hanson JR., Anson BJ. and Bast TH.
Antecedent phases of all otological illve tigation, carried out at Northwestern University and the University of Wisconsin dealt with developmental stage in which thr otic capsule, the auditory ossicles and the related brachial arches were well formed in cartilage.
Fig. 11. Although the interhyale has become considerably narrower in the embryo of 1?’ mm. (7 weeks), it still serves as a definitive connection between the visceral bar (Reichert's cartilage) and the stapes. The second visceral bar may be regarded as bifurcating at its proximal extremity, the diver- gent parts continuing as the laterohyale and the interhyale, with the facial nerve passing over and between. them. The laterohyale is now continuous with the capsule and the interhyale is (as it was from the beginning) continuous with the stapes. The size, shape and relationships of the interhyale have changed markedly since its difierentiatioen from the blastemal lobe of the 7-mm. embryo; its mes- cnchymal composition has not yet been altered, despite the fact that it will soon assume the ‘role of tendon for the stapedial muscle.
The otic capsule, continuing its increase in size, shows transition from mesenehyme to preeartilage to cartilage. The stapedial impression into the capsular wall is thus increased by diflerential growth, but the division between the annulus stapedialis and lamina stapedialis remains apparent. The cells of the stapes, however, blend with those of the incus, there being no articulation as yet at the im-mlo- stapedial junction.
A small stapedial artery (arrow) is seen medial to the stapedial ring; it can be traced through the obturator foramen to its source lateral to the ossicle.
Cite this page: Hill, M.A. (2024, April 25) Embryology Paper - The early embryology of the auditory ossicles in man. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_early_embryology_of_the_auditory_ossicles_in_man
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