RN

There are multiple definitions:

  1. registered nurse(English)

  2. red nucleus(English)

    • this term applies to two different, independent nervous structures: the magnocellular RN and parvocellular RN. The RN comprises a large group of cells located in the ventral medial mesencephalon. Caudally, the RN is bounded by the decussation of the superior cerebellar peduncle, and rostrally the RN reaches approximately to the level of the habenulo-interpeduncular tract (fasciculus retroflexus). The primate RN is distinguished by two characteristics: one is the presence of extremely large cells at its caudal pole, and the second is the presence of a large body of small cells rostral to the giant cells. The nucleus is thus commonly divided into a caudal magnocellular division, RNm, and a rostral parvicellular (or parvocellular) division, RNp. The defining characteristics of the RN are inputs from the cerebellar nuclei and cerebral cortex and projection to either the contralateral spinal cord via the rubrospinal tract (RST) or ipsilateral inferior olive (IO) via the central tegmental tract. The very largest cells of RNm project to the contralateral spinal cord, and the smallest cells of RNp project to the ipsilateral IO. The projections are mutually exclusive, but both cell populations receive input from the cerebellar nuclei as well as from the cerebral cortex
    • RMC, RPC, RST, IO, RNm, RNp
    • Anatomy, Brain (dys)function, Neurons, Spine (or spinal cord)
    • https://doi.org…2/jn.00950.2000
    • https://doi.org…45046-9.01334-6

  3. regenerative nodule(English)

    • a well-defined area of liver parenchyma that has enlarged in response to necrosis and altered circulation. Based on gross morphologic features, the nodular regeneration can be classified as micronodular (<3 mm in diameter) or macronodular (>3 mm in diameter). Unless a regenerative nodule contains iron, it is rarely seen on a noncontrast CT
    • Liver disease
    • https://doi.org…155/2013/129396

  4. radical nephrectomy(English)

  5. rippled noise(English)

  6. radiation necrosis(English)