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lobe (lob)

1. One of the subdivisions of an organ or other part, bounded by fissures, connective tissue, septa, or other structural demarcations. 2. A rounded projecting part, as the l. of the ear. See also lobule. 3. One of the larger divisions of the crown of a tooth, formed from a distinct point of calcification.lobus [NA]; [G. lobos, lobe]
anterior l. of hypophysis * official alternate term for adenohypophysis
az´ygos l. of lung a small accessory l. sometimes found on the apex of the right lung; separated from the rest of the upper l. by a deep groove lodging the azygos vein.lobus azygos;
caudate l. lobus caudatus
l.'s of cerebrum lobi cerebri, under lobus
cuneiform l. biventer lobule
ear l. the lowest part of the auricle; it consists of fat and fibrous tissue not reinforced by the auricular cartilage.lobulus auriculae [NA], lobule of auricle;
falciform l. cingulate gyrus
flocculonodular l. the small posterior and inferior subdivision of the cerebellar cortex that borders the line of attachment of the choroid roof of the rhomboid fossa, and consists of the left and right flocculus together with the unpaired nodulus (the most posterior of the folia composing the vermis cerebelli). Its major afferent connections come from the vestibular nuclei and directly from the vestibular nerve; it projects largely to the vestibular nuclei, directly and by way of the fastigial nucleus.
frontal l. frontal l. of cerebrum
frontal l. of cerebrum the portion of each cerebral hemisphere anterior to the central sulcus.lobus frontalis cerebri [NA], frontal l;
glandular l. of hypophysis adenohypophysis
Home's l. the enlarged middle l. of the prostate gland.
inferior l. of lung it is located below and behind the oblique fissure and contains five bronchopulmonary segments: superior, medial basal, anterior basal, lateral basal, and posterior basal.lobus inferior pulmonis [NA], lower l. of lung;
left l. the left subdivision of several glands, e.g., prostate, thyroid, thymus.lobus sinister [NA];
left l. of liver it is separated from the right lobe above and in front by the falciform ligament, and from the quadrate and caudate lobes by the fissure for the ligamentum teres and the fissure for the ligamentum venosum; the distribution of the portal vein, hepatic artery, and bile ducts does not correspond to the gross lobar divisions of the liver. It contains two segments, superior and inferior.lobus hepatis sinister [NA];
limbic l. as originally defined by P. Broca: the nearly closed ring of the brain structures surrounding the hilus, or margin, of the cerebral hemisphere of mammals; it is composed of the fornicate gyrus (cingulate gyrus and parahippocampal gyrus), the hippocampus, and the amygdala. See limbic system.
lingual l. cingulum of tooth
lower l. of lung inferior l. of lung
l.'s of mammary gland the 15 to 20 separate portions of the mammary gland that radiate from the central area deep to the nipple like wheel spokes and comprise the body of the mammary gland; each is drained by a single lactiferous duct.lobi glandulae mammariae [NA];
middle l. of prostate the portion of the prostate lying between the urethra and the ejaculatory ducts; indistinct unless hypertrophied.lobus medius prostatae [NA], Morgagni's caruncle;
middle l. of right lung it is located anteriorly between the horizontal and oblique fissures and includes lateral and medial bronchopulmonary segments.lobus medius pulmonis dextri [NA];
nervous l. nervous l. of hypophysis
nervous l. of hypophysis the bulbous part of the neurohypophysis attached to the hypothalamus by the infundibulum. It is composed of pituicytes, blood vessels, and terminals of nerve fibers from the supraoptic and paraventricular nuclei.lobus nervosus, nervous l;
occipital l. occipital l. of cerebrum
occipital l. of cerebrum the posterior, somewhat pyramid-shaped part of each cerebral hemisphere, demarcated by no distinct surface markings on the lateral convexity of the hemisphere from the parietal and temporal lobes, but sharply delineated from the parietal lobe by the parieto-occipital sulcus on the medial surface.lobus occipitalis cerebri [NA], occipital l;
parietal l. parietal l. of cerebrum
parietal l. of cerebrum the middle portion of each cerebral hemisphere, separated from the frontal lobe by the central sulcus, from the temporal lobe by the lateral sulcus in front and an imaginary line projected posteriorly, and from the occipital lobe only partially by the parieto-occipital sulcus on its medial aspect.lobus parietalis cerebri [NA], parietal l;
placental l.'s cotyledons of the human placenta, viewed on the maternal surface as irregularly shaped elevations or l.'s.
polyalveolar l. a type of congenital anomaly where a severalfold increase in the total alveolar number leads to congenital lobar emphysema.
posterior l. of hypophysis neurohypophysis
l. of prostate one of the lateral lobes (right or left) or the middle lobe or isthmus of the prostate; in the adult the lobes are ill-defined.lobus prostatae [NA];
pyramidal l. of thyroid gland an inconstant narrow lobe of the thyroid gland that arises from the upper border of the isthmus and extends upward, sometimes as far as the hyoid bone; it marks the point of continuity with the thyroglossal duct.lobus pyramidalis glandulae thyroideae [NA], Lallouette's pyramid, Morgagni's appendix, pyramid of thyroid;
quadrate l. 1. a lobe on the inferior surface of the liver located between the fossa for the gallbladder and the fissure for the ligamentum teres; 2. quadrangular lobule 3. precuneus
renal l. one of the subdivisions of the kidney, consisting of a renal pyramid and the cortical tissue associated with it.lobus renalis [NA];
Riedel's l. an occasional tongue-like process extending downward from the right l. of the liver lateral to the gallbladder; a similar process may, though rarely, extend from the left lobe.lobus appendicularis, lobus linguiformis;
right l. the right subdivision of several glands, e.g., prostate, thyroid, thymus.lobus dexter [NA];
right l. of liver the largest lobe of the liver, separated from the left lobe above and in front by the falciform ligament and from the caudate and quadrate lobes by the sulcus for the vena cava and the fossa for the gallbladder; it contains two segments, anterior and posterior.lobus hepatis dexter [NA];
Spigelius' l. lobus caudatus
superior l. of lung the lobe of the right lung that lies above the oblique and horizontal fissures and includes the apical, posterior and anterior bronchopulmonary segments; in the left lung, the lobe lies above the oblique fissure and contains the apicoposterior, anterior, superior lingular and inferior lingular segments.lobus superior pulmonis [NA], upper l. of lung;
supplemental l. in dental anatomy, an extra l.; one that is not included in the typical formation of a tooth.
temporal l. a long l., the lowest of the major subdivisions of the cortical mantle, forming the posterior two-thirds of the ventral surface of the cerebral hemisphere, separated from the frontal and parietal l.'s above it by the lateral sulcus arbitrarily delineated by an imaginary plane from the occipital l. with which it is continuous posteriorly. The temporal l. has a heterogeneous composition: in addition to a large neocortical component consisting of the superior, middle, and inferior temporal gyri and the lateral and medial occipitotemporal gyri, it includes the largely juxtallocortical parahippocampal gyrus with its paleocortical (olfactory) uncus and, beneath the latter, the amygdala.lobus temporalis [NA], temporal cortex;
l.'s of thyroid gland the two major divisions of the gland lying on the right and left side of the trachea and connected by the isthmus. A smaller pyramidal lobe is frequently present as an upward extension from the isthmus.lobi glandulae thyroideae [NA];
upper l. of lung superior l. of lung


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