| 释义 |
medulla oblongata
medulla ob·lon·ga·ta M0195900 (ŏb′lông-gä′tə)n. pl. medulla ob·lon·ga·tas or me·dul·lae ob·lon·ga·tae (mĭ-dŭl′ē ŏb′lông-gä′tē) The lowermost portion of the vertebrate brain, continuous with the spinal cord, responsible for the control of respiration, blood pressure and heart rate, and certain other involuntary bodily functions.
[New Latin medulla oblongāta : Latin medulla, medulla + New Latin oblongāta, feminine of oblongātus, oblong.]medulla oblongata (ˌɒblɒŋˈɡɑːtə) n, pl medulla oblongatas or medullae oblongatae (mɪˈdʌliː ˌɒblɒŋˈɡɑːtiː) (Anatomy) the lower stalklike section of the brain, continuous with the spinal cord, containing control centres for the heart and lungs[C17: New Latin: oblong-shaped medulla]medul′la ob•long•a′ta (ˌɒb lɔŋˈgɑ tə, -lɒŋ-)
n., pl. medulla oblongatas. the lowest or hindmost part of the vertebrate brain, continuous with the spinal cord. [1670–80; < New Latin: the long medulla] medulla ob·lon·ga·ta (ŏb′lông-gä′tə) The lowermost portion of the brainstem in humans and other mammals. It regulates many involuntary functions, such as breathing and circulation.medulla oblongataThe lowest part of the brain stem, which contains the vital centers controlling heartbeat and respiration.Thesaurus| Noun | 1. |  medulla oblongata - lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata); "the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"medulla, bulbneural structure - a structure that is part of the nervous systembrain stem, brainstem, brain-stem - the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamusrespiratory center - the center in the medulla oblongata and pons that integrates sensory information about the level of oxygen and carbon dioxide in the blood and determines the signals to be sent to the respiratory muscles |
EncyclopediaSeeMedulla Oblongatamedulla oblongata
medulla [mĕ-dul´ah] (L.) 1. the inmost part of a structure or organ.2. medulla oblongata.3. marrow. adj., adj med´ullary.adrenal medulla the inner portion of the adrenal gland, where epinephrine and norepinephrine are produced.medulla of bone marrow" >bone marrow.medulla oblonga´ta that part of the hindbrain continuous with the pons above and the spinal cord below; it houses nerve centers for both motor and sensory nerves, where such functions as breathing and the beating of the heart are controlled. See also brain.medulla os´sium marrow" >bone marrow.renal medulla the inner part of the substance of the kidney, composed chiefly of tubules" >collecting tubules, and organized into a group of structures called the pyramids" >renal pyramids.medulla spina´lis (medulla spina´lis) spinal cord.medulla of thymus the central portion of each lobule of the thymus; it contains many more reticular cells and far fewer lymphocytes than does the surrounding cortex.me·dul·la ob·lon·ga·'ta [TA] the most caudal subdivision of the brainstem, immediately continuous with the spinal cord, extending from the lower border of the decussation of the pyramid to the pons; its anterior (ventral) surface resembles that of the spinal cord except for the bilateral prominence of the inferior olive; the posterior (dorsal) surface of its upper half forms part of the floor of the fourth ventricle. Motor nuclei of the medulla oblongata include the hypoglossal nucleus, the dorsal motor nucleus, inferior salivatory nucleus, and the nucleus ambiguus; sensory nuclei include the nuclei of the posterior column (gracile and cuneate), the cochlear and vestibular nuclei, the middle and caudal portions of the spinal trigeminal nucleus, and the nucleus of the solitary tract.
See also: medulla. Synonym(s): myelencephalon [TA], oblongatamedulla oblongata (ŏb′lông-gä′tə)n. pl. medulla oblonga·tas or medullae oblongatae (mĭ-dŭl′ē ŏb′lông-gä′tē) The lowermost portion of the vertebrate brain, continuous with the spinal cord, responsible for the control of respiration, circulation, and certain other bodily functions.medulla oblongata The lower half of the brain stem, which is located between the spinal cord and the pons.
Content
• Cardiac centre—Sympathetic, parasympathetic systems.
• Respiration centre—Contains chemoreceptors.
• Vasomotor centre—Contains baroreceptors.
• Reflex centres—For vomiting, coughing, sneezing, swallowing.
Function
Autonomic and involuntary functions, including breathing, maintaining the heart rate and blood pressure.me·dul·la ob·lon·ga·ta (mĕ-dŭl'ă ob-long-gā'tă) [TA] The most caudal subdivision of the brainstem, continuous with the spinal cord, extending from the lower border of the decussation of the pyramid to the pons; its ventral surface resembles that of the spinal cord except for the bilateral prominence of the inferior olive; the dorsal surface of its upper half forms part of the floor of the fourth ventricle. Motor nucleiof the medulla oblongata include the hypoglossal nucleus, the dorsal motor nucleus, inferior salivatory nucleus, and the nucleus ambiguus; sensory nuclei include the nuclei of the posterior column (gracile and cuneate), the cochlear and vestibular nuclei, the mid and caudal portions of the spinal trigeminal nucleus, and the nucleus of the solitary tract.
See also: medulla
Synonym(s): myelencephalon, oblongata. medulla (me-dul'a, dul') plural.medullae [L. medulla, marrow, pith] 1. Marrow (1).2. In anatomy, the innermost or central portion of an organ in contrast to the cortex.3. The caudal segment of the hindbrain. Synonym: medulla oblongata; bulb (2)4. The medulla ossium. medullary (med'ul-er?e, mej?), adjective ADRENAL MEDULLAadrenal medullaThe central tissue of the adrenal gland. It is filled with pheochromocytes, which are derived from the neural crest and resemble postsynaptic sympathetic ganglion cells. In response to stimulation by presynaptic sympathetic axons, the pheochromocytes secrete epinephrine and norepinephrine into the bloodstream. See: illustration See: adrenal glandmedulla of hairThe central axis of a hair.medulla of kidneys See: pyramid, renalmedulla nephrica See: pyramid, renalmedulla oblongataMedulla (3).medulla ossiumMarrow (1).medulla of ovaryThe central portion of the ovary, composed of loose connective tissue, blood vessels, lymphatics, and nerves.medulla spinalisThe spinal cord.medulla oblongata The part of the BRAINSTEM lying below the PONS and immediately above the spinal cord, just in front of the CEREBELLUM. The medulla oblongata contains the nuclei of the lower four CRANIAL NERVES, the vital centres for respiration and control of heart-beat, and the long motor and sensory tracts running down to and up from the spinal cord. Disease or injury to the medulla is always serious, often fatal.medulla oblongata the posterior part of the hindbrain of vertebrates that connects with the spinal cord. It is ventrally thick-walled and contains groupings of nerve cells called nuclei. The thin-walled posterior CHOROID PLEXUS is situated on its dorsal side. The medulla contains several important areas of nervous control not influenced by conscious action. The respiratory and cardiovascular centres control respiration and heartbeat and organs of the LATERAL-LINE SYSTEM. The ear, taste and touch receptors also have their impulses coordinated in the medulla.Medulla oblongataThe lowest section of the brainstem, located next to the spinal cord. The medulla is the site of important cardiac and respiratory regulatory centers.Mentioned in: Anesthesia, Generalme·dul·la ob·lon·ga·ta (mĕ-dŭl'ă ob-long-gā'tă) [TA] The most caudal subdivision of the brainstem, continuous with the spinal cord, extending from the lower border of the decussation of the pyramid to the pons.
Synonym(s): myelencephalon, oblongata. medulla oblongata
Related to medulla oblongata: cerebellum, pons, hypothalamus, midbrain, spinal cordSynonyms for medulla oblongatanoun lower or hindmost part of the brainSynonymsRelated Words- neural structure
- brain stem
- brainstem
- brain-stem
- respiratory center
|