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rachisenUK
ra·chis R0006100 (rā′kĭs)n. pl. ra·chis·es or rach·i·des (răk′ĭ-dēz′, rā′kĭ-) 1. a. The main stem of an elongated inflorescence, as in a grass.b. The main axis of a pinnately compound leaf or of a fern frond.2. The main shaft of a bird's feather, especially the part to which the barbs are attached.3. The spinal column.
[New Latin, from Greek rhakhis, spine, ridge.]
ra′chi·al adj.rachis (ˈreɪkɪs) or rhachisn, pl rachises, rhachises, rachides or rhachides (ˈrækɪˌdiːz; ˈreɪ-) 1. (Botany) botany the main axis or stem of an inflorescence or compound leaf2. (Zoology) ornithol the shaft of a feather, esp the part that carries the barbs3. (Anatomy) another name for spinal column[C17: via New Latin from Greek rhakhis ridge] rachial, rhachial rachidial, rhachidial adjra•chis (ˈreɪ kɪs)
n., pl. ra•chis•es, rach•i•des (ˈræk ɪˌdiz, ˈreɪ kɪ-) 1. any of various axial structures of a plant, as the stem of a leaflet. 2. the part of the shaft of a feather bearing the web. 3. spinal column. [1775–85; < New Latin < Greek rháchis spine] Thesaurus| Noun | 1. |  rachis - axis of a compound leaf or compound inflorescenceaxis - the main stem or central part about which plant organs or plant parts such as branches are arranged | | 2. |  rachis - the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back"spinal column, spine, vertebral column, backbone, backnotochord - a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrateschine - backbone of an animalcanalis vertebralis, spinal canal, vertebral canal - the canal in successive vertebrae through which the spinal cord passescoccyx, tail bone - the end of the vertebral column in humans and tailless apesvertebra - one of the bony segments of the spinal columnintervertebral disc, intervertebral disk - a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two)skeletal structure - any structure created by the skeleton of an organismaxial skeleton - the part of the skeleton that includes the skull and spinal column and sternum and ribs |
Translations
rachisenUK
rachis[′rā·kəs] (anatomy) The vertebral column. (biology) An axial structure such as the axis of an inflorescence, the central petiole of a compound leaf, or the central cord of an ovary in Nematoda. rachisenUK
spine [spīn] 1. a thornlike process or projection; called also acantha and spina.2. the rigid bony structure in the midline of the back, composed of the vertebrae; called also backbone, spinal column, and vertebral column.
The spinal column is the axis of the skeleton; the skull and limbs are in a sense appendages. The vertebrae also provide the protective bony corridor (canal" >spinal canal) through which the spinal cord passes; they can move to a certain extent and so give flexibility to the spine, allowing it to bend forward, sideways and, to a lesser extent, backward. In the areas of the neck and lower back, the spine also can pivot, which permits the turning of the head and torso.
There are usually 24 movable vertebrae and nine that are fused together. The topmost are the seven cervical vertebrae, which form the back of the neck, supporting the skull. The head turns from side to side by means of a pivotal motion between the two highest vertebrae. Below these are the 12 thoracic vertebrae, the supports on which the ribs are hinged, and then the five lumbar vertebrae, the largest movable vertebrae (the cervical are the smallest). Below the lumbar vertebrae, the spine terminates with two groups of vertebrae fused into single bones: the sacrum, composed of five vertebrae, and the coccyx, composed of four vertebrae. Viewed from the side of the body, the spine has the shape of a gentle double S curve.Malformations of the Spine. Of the various types of spinal malformations, some are congenital and others the result of postural defects or injuries. spina bifida is congenital. kyphosis may occasionally be congenital but is more often caused by one of the diseases that attack the structure of the bones. The most common of these is pott's disease, or tuberculosis affecting the vertebrae and soft tissues of the spine. Another is osteitis deformans, a type of bone inflammation in which parts of the bone are replaced by softer tissue. scoliosis is a curvature of the spine toward one side.cervical spine that portion of the spine comprising the vertebrae" >cervical vertebrae.lumbar spine that portion of the spine comprising the vertebrae" >lumbar vertebrae.thoracic spine that part of the spine comprising the vertebrae" >thoracic vertebrae.ver·te·bral col·umn [TA] the series of vertebrae that extend from the cranium to the coccyx, providing support and forming a flexible bony case for the spinal cord. Synonym(s): columna vertebralis [TA], spine (2) [TA], backbone, dorsal spine, rachis, spina dorsalis, spinal column, vertebrariumrachis (rā′kĭs)n. pl. rachises or rachides (răk′ĭ-dēz′, rā′kĭ-) 1. a. The main stem of an elongated inflorescence, as in a grass.b. The main axis of a pinnately compound leaf or of a fern frond.2. The main shaft of a bird's feather, especially the part to which the barbs are attached.3. The spinal column.
ra′chi·al adj.ver·te·bral col·umn (vĕr'tĕ-brăl kol'ŭm) [TA] The series of vertebrae that extend from the cranium to the coccyx, providing support and forming a flexible bony case for the spinal cord.
Synonym(s): columna vertebralis [TA] , backbone, rachis, spina, spinal column, spine (2) . rachis or rhacis any central axis, particularly that of a feather.rachisenUK
Related to rachis: petioluleSynonyms for rachisnoun axis of a compound leaf or compound inflorescenceRelated Wordsnoun the series of vertebrae forming the axis of the skeleton and protecting the spinal cordSynonyms- spinal column
- spine
- vertebral column
- backbone
- back
Related Words- notochord
- chine
- canalis vertebralis
- spinal canal
- vertebral canal
- coccyx
- tail bone
- vertebra
- intervertebral disc
- intervertebral disk
- skeletal structure
- axial skeleton
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