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Identification of the efferent neurons to the lagena of the chick (726.5)
Author(s) -
Mahmoud Amany,
Maklad Adel
Publication year - 2014
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.28.1_supplement.726.5
Subject(s) - efferent , efferent neuron , vestibular system , anatomy , vestibular nuclei , nucleus , neuroscience , biology , brainstem , hindbrain , central nervous system , afferent
The efferent neurons of the inner ear are part of a descending pathway from the hindbrain. Although the efferent axons innervate sensory epithelium, the inner ear efferent neurons are derived from the motor column. To date, some problems about the anatomy and function of the efferent vestibular system are still unsolved. In birds, efferent cochlear neurons lie in two areas in the brainstem a dorsal group medial to the facial motor nucleus and a ventral group medial to the lateral superior olive. However, the location of the vestibular efferent neurons in birds is still unclear. The body of work on this point found that the vestibular efferent neurons are one group located medial to facial motor nucleus. However, in one study the vestibular efferent neurons lie in two main groups as the auditory efferent neurons. To solve this problem we implanted Neuro Vue Red (lipophilic tracer) in the macula lagena of post fixed E 19 chick. We found that the efferent vestibular neurons in the chick lie in two nuclei, the dorsomedial nucleus located medial to the facial motor nucleus and the ventrolateral nucleus located medial lateral superior olive. Our results suggest that the vestibular and auditory efferent neurons are developed from a single nucleus in the hindbrain