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- W2080722068 abstract "The orbicularis oris and buccinator muscles of mammals form an important subset of the facial musculature, the perioral muscles. In many taxa, these muscles form a robust muscular hydrostat capable of highly manipulative fine motor movements, likely accompanied by a specialized pattern of innervation. We conducted a retrograde nerve-tracing study of cranial nerve (CN) VII in pigs (Sus scrofa) to: (1) map the motor neuron pool distributions of the superior and inferior orbicularis oris, and the buccinator, to test the hypothesis that perioral muscle motor neuron pools exhibit a somatotopic organization within the facial motor nucleus; and (2) test the hypothesis that portions of the superior orbicularis oris (SOO) motor neuron pool also exhibit a somatotopic organization, reflecting a potential compartmentalization of function of the rostral, middle, and caudal segments of this muscle. Cresyl violet histological staining showed that the pig facial motor nucleus was comprised of 7 well-defined subnuclei. Neuroanatomical tracers injected into these perioral muscles transported to the motor neuron pools of the lateral 4 of the 7 subnuclei of the facial motor nucleus. The motor neuron pools of the perioral muscles were generally segregated from motoneurons innervating other facial muscles of the rostrum. However, motor neuron pools were not confined to single nuclei but instead spanned across 3-4 subnuclei. Perioral muscle motor neuron pools overlapped but were organized somatotopically. Motor neuron pools of portions of the SOO overlapped greatly with each other but exhibited a crude somatotopy within the SOO motor neuron pool. The large and somatotopically organized SOO motor neuron pool in pigs suggests that the upper lip might be more richly innervated than the other perioral muscles and functionally divided." @default.
- W2080722068 created "2016-06-24" @default.
- W2080722068 creator A5029406293 @default.
- W2080722068 creator A5044989318 @default.
- W2080722068 creator A5052412512 @default.
- W2080722068 date "2005-01-01" @default.
- W2080722068 modified "2023-10-17" @default.
- W2080722068 title "Somatotopic Organization of Perioral Musculature Innervation within the Pig Facial Motor Nucleus" @default.
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- W2080722068 doi "https://doi.org/10.1159/000085045" @default.
- W2080722068 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15821346" @default.
- W2080722068 hasPublicationYear "2005" @default.
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