| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [stra... |
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| ROI | reactive oxygen intermediate; region of interest; right occipitolateral [fetal position] |
| intermediate filaments | Cytoplasmic filaments intermediate in diameter (about 10 nanometers) between the microfilaments and the microtubules. They may be composed of any of a number of different proteins and form a ring around the cell nucleus. (12 Dec 1998) |
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| intermediate ganglia | Small sympathetic ganglia most commonly found on the communicating branches in the cervical and lumbar region. Synonym: ganglia intermedia. (05 Mar 2000) |
| intermediate great muscle | <anatomy, muscle> Origin, upper three-fourths of anterior surface of shaft of femur; insertion, tibial tuberosity by way of common tendon of quadriceps femoris and patellar ligament; action, extends leg; nerve supply, femoral. Synonym: musculus vastus intermedius, crureus, femoral muscle, intermediate great muscle, intermediate vastus muscle. (05 Mar 2000) |
| intermediate heart | Loosely, description of the heart's electrical axis when this is directed at approximately between +30 |
| intermediate host | <epidemiology> See vector. (05 Dec 1998) |
| intermediate hypothalamic region | The infundibular portion of the hypothalamus, includes the medial tuberal nuclei and portions of the dorsomedial, ventromedial, arcuate (infundibular), posterior and lateral hypothalamic nuclei; located internally in the general area of the infundibulum. (05 Mar 2000) |
| intermediate image plane | <microscopy> In a light microscope, the plane into which the objective lens directly focuses the image of the specimen. The plane is usually located a set distance (commonly 10 mm) below the shoulder for the ocular and another fixed distance (generally 160 mm) behind the rear focal plane of the objective lens. The ocular forms a virtual image of the intermediate image for visual observation, or projects a real image for photography and video microscopy. Note: The objective lens, combined with the coverslip of proper thickness, is corrected for projecting the primary image to the specified intermediate image plane only. (05 Aug 1998) |
| intermediate junction | <cell biology> Specialised intercellular junction in which the membranes are separated by 15-25nm and into which are inserted microfilaments. Similar in structure to two apposed focal adhesions, though this may be misleading. Microfilaments inserted into the zonula adherens may interact (via myosin) with other microfilaments to generate contraction. Constitute mechanical coupling between cells. (18 Nov 1997) |
| intermediate lacunar lymph node | A lymph node of the external iliac group located between the external iliac artery and vein at the vascular lacuna. Synonym: nodus lacunaris intermedius, intermediate lacunar node. (05 Mar 2000) |
| intermediate lacunar node | A lymph node of the external iliac group located between the external iliac artery and vein at the vascular lacuna. Synonym: nodus lacunaris intermedius, intermediate lacunar node. (05 Mar 2000) |
| intermediate lamella | One of the lamellae of partially resorbed osteons occurring between newer, complete osteons. Synonym: ground lamella, intermediary system, intermediate lamella. (05 Mar 2000) |
| intermediate laryngeal cavity | Portion of the cavity of the larynx between the vestibular and vocal folds, with which the ventricles communicate. Synonym: aditus glottidis superior. (05 Mar 2000) |
| intermediate layer | The nuclear zone of the developing neural tube between the marginal layer and the ependymal layer; forms the gray matter of the central nervous system. Synonym: intermediate layer, mantle zone. (05 Mar 2000) |
| intermediate layer of the transversospinalis muscles | <anatomy, muscle> Origin, from the sacrum, sacroiliac ligament, mamillary processes of the lumbar vertebrae, transverse processes of thoracic vertebrae, and articular processes of last four cervical vertebrae; insertion, into the spinous processes of all the vertebrae up to and including the axis; action, rotates vertebral column; nerve supply, dorsal primary rami of spinal nerves. Synonym: musculus multifidus, intermediate layer of the transversospinalis muscles, musculus multifidus spinae. (05 Mar 2000) |
| intermediate line of iliac crest | The line on the crest of the ilium between the outer and inner lips, for origin of internal oblique muscle. Synonym: linea intermedia cristae iliacae. (05 Mar 2000) |