cervical loop


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an·sa cer·vi·ca·'lis

[TA]
a loop in the cervical plexus consisting of fibers from the first three cervical nerves. Fibers from a loop between the C1 and C2 spinal nerves accompany the hypoglossal nerve for a short distance, leaving it as the superior root of the ansa cervicalis. Fibers from a loop between the C2 and C3 spinal nerves form the inferior root of the ansa cervicalis. Most commonly the roots merge, forming the ansa cervicalis, which gives rise to branches innervating infrahyoid muscles.
Farlex Partner Medical Dictionary © Farlex 2012

an·sa cer·vi·ca·lis

(an'să sĕr-vi-kā'lis) [TA]
A loop in the cervical plexus consisting of fibers from the first three cervical nerves. Fibers from a loop between the C1 and C2 spinal nerves accompany the hypoglossal nerve for a short distance, leaving it as the superior root of the ansa cervicalis. Fibers from a loop between the C2 and C3 spinal nerves form the inferior root of the ansa cervicalis. Most commonly, the roots merge, forming the ansa cervicalis, which gives rise to branches innervating infrahyoid muscles.
Synonym(s): cervical loop.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cervical loop

The part of an enamel organ in which the inner enamel epithelium is continuous with the outer enamel epithelium. This establishes the limit of enamel formation and therefore represents the site of the cementoenamel junction. The cells of the cervical loop become Hertwig's epithelial root sheath, induce dentinogenesis, and determine the number, size, and shape of the tooth roots.
See also: loop
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
FGF7, detected in the developing bone surrounding the molar tooth germ and the mesenchyme adjacent to the incisor cervical loop, is involved in the formation of alveolar bone [63].
Tooth size and cusp number decrease if the size of the pEK is too small, since a small size can affect the dental epithelium folding as well as the cervical loop and sEK formation.
FGF signaling is known to have an important role in the regulation of incisor cervical loop maintenance (Figure 2).

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