Auditory vesicle
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| Auditory vesicle | ||
|---|---|---|
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| Embryo between eighteen and twenty-one days. | ||
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| Section through hind-brain and auditory vesicles of an embryo more advanced than that of Fig. 898. | ||
| Gray's | subject #228 1030 | |
| Precursor | auditory pit | |
| Dorlands/Elsevier | v_07/12855397 | |
The mouth of the auditory pit is then closed, and thus a shut sac, the auditory vesicle (or otic vesicle[1]), is formed; from it the epithelial lining of the membranous labyrinth is derived.
The vesicle becomes pear-shaped, and the neck of the flask is obliterated.
From the vesicle certain diverticula are given off which form the various parts of the membranous labyrinth.
One from the middle part forms the ductus and saccus endolymphaticus, another from the anterior end gradually elongates, and, forming a tube coiled on itself, becomes the cochlear duct, the vestibular extremity of which is subsequently constricted to form the canalis reuniens.
Three others appear as disk-like evaginations on the surface of the vesicle; the central parts of the walls of the disks coalesce and disappear, while the peripheral portions persist to form the semicircular ducts; of these the superior is the first and the lateral the last to be completed.
The central part of the vesicle represents the membranous vestibule, and is subdivided by a constriction into a smaller ventral part, the saccule, and a larger dorsal and posterior part, the utricle.
This subdivision is effected by a fold which extends deeply into the proximal part of the ductus endolymphaticus, with the result that the utricle and saccule ultimately communicate with each other by means of a Y-shaped canal.
The saccule opens into the cochlear duct, through the canalis reuniens, and the semicircular ducts communicate with the utricle.
Additional images
 Lateral views of membranous labyrinth and acoustic complex. X 25 dia. |
 Median views of membranous labyrinth and acoustic complex in human embryos. X 25 dia. |
References
 | This developmental biology article is a stub. You can help Wikipedia by expanding it. |
Prenatal development/Mammalian development of nervous system | |
|---|---|
| General neural development/ neurulation/neurula | Notochord - Neuroectoderm - Neural plate - Neural folds - Neural groove
Neural crest - Neural tube (Neuromere/Rhombomere, Cephalic flexure) Alar plate (sensory) - Basal plate (motor) Glioblast - Neuroblast |
| Eye development | Optic vesicles - Optic stalk - Optic cup - Lens placode |
| Auditory development | Auditory vesicle - Auditory pit |
| Note: mostly ecoderm, but mesoderm is precursor for epineurium, perineurium, and endoneurium | |
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
