sheath

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Related to carotid sheath: recurrent laryngeal nerve

sheath

1. Biology an enclosing or protective structure, such as a leaf base encasing the stem of a plant
2. the protective covering on an electric cable

sheath

[shēth]
(electricity)
A protective outside covering on a cable.
(electronics)
A space charge formed by ions near an electrode in a gas tube.
(electromagnetism)
The metal wall of a waveguide.
(science and technology)
A protective case or cover.

sheath

In reinforced concrete, an enclosure which encases posttensioned tendons to prevent their being bonded during the placement of concrete.
References in periodicals archive ?
The wedged position of scalenus anterior between the carotid sheath and the brachial plexus/scalenus medius will also make differentiating between scalenus anterior and these structures difficult.
All imaging protocols should contain anterior planar images from the ears through the inferior border of the heart to screen for ectopic adenomas, which can be located anywhere from the carotid sheath to the inferior cardiac border.
Exploration of the carotid sheath to the lateral pharyngeal wall may be undertaken to fully excise any tract that may not have been identified on preoperative imaging (1).
CLINICAL SIGNIFICANCE: From its origin, the aberrant muscle deviated laterally crossing in front of the common carotid artery (shown in photograph) to ascend in the anterior wall of carotid sheath.
Contrast enhanced CT scan is the best initial diagnostic study to determine the size and extent of tumor, possible origin of tumor based on displacement of carotid sheath and preservation of parapharyngeal fat and to demonstrate degree of tumor vascularity.
In the current case, the infiltrative nature of this mass along the carotid sheath suggested an extranodal process but revealed no additional specific findings.
The fistulous tract ascends along the carotid sheath, then posterior to the common carotid artery, then superior to the superior laryngeal, hypoglossal, and vagus nerves; it finally opens into the piriform sinus.
1-3) To our knowledge, no solitary fibrous tumor arising in the carotid sheath has been reported until now.
It also extended medially into the parapharyngeal space anterior to the carotid sheath (figure 1, C).
The sternocleidomastoid muscle was then retracted laterally, exposing the carotid sheath.