lobe

[lōb]

1. a more or less well defined portion of an organ or gland.

2. one of the main divisions of a tooth crown.

azygos lobe (lobe of azygos vein) a small anomalous lobe situated at the apex of the right lung, produced when the azygos vein arches over the upper part of the lung instead of at the hilus and presses deeply into the lung tissue to form a fissure that isolates a medial part of the lung.

caudate lobe a small lobe of the liver between the inferior vena cava on the right and the left lobe.

ear lobe the lower fleshy, noncartilaginous portion of the external ear.

flocculonodular lobe one of the main subdivisions of the cerebellum, located inferiorly, consisting of the paired flocculi, their peduncles, and the nodule of the vermis.

frontal lobe the anterior portion of the gray matter of each cerebral hemisphere.

hepatic lobe one of the lobes of the liver, designated the right and left and the caudate and quadrate.

l's of lung the five major subdivisions of the lungs. see accompanying illustration and see lung.

The lobes of the lungs. From Frazier et al., 2000.

occipital lobe the most posterior portion of each cerebral hemisphere, forming a small part of its posterolateral surface. See illustration.

The occipital lobe of the brain. From Applegate, 2000.

parietal lobe the upper central portion of the gray matter of each cerebral hemisphere, between the frontal lobe and the occipital lobe and above the temporal lobe. It is the receptive area for fine sensory stimuli, and the highest integration and coordination of sensory information is carried on here. Damage to it can produce defects in vision or aphasia.

polyalveolar lobe a congenital disorder characterized in early infancy by the presence of far more than the normal number of alveoli in a lobe of the lungs; thereafter, normal multiplication of alveoli does not take place and they become enlarged, i.e., emphysematous.

quadrate lobe

1. precuneus.

2. a small lobe of the liver, between the gallbladder on the right, and the left lobe.

Riedel's lobe an anomalous tongue-shaped mass of tissue projecting from the right lobe of the liver in some individuals.

spigelian lobe caudate lobe.

temporal lobe a long tongue-shaped process that is the lower lateral portion of each cerebral hemisphere.

fron·tal lobe of cer·e·brum

[TA]

the portion of each cerebral hemisphere anterior to the central sulcus.

Synonym(s): frontal lobe [TA], lobus frontalis [TA]

Farlex Partner Medical Dictionary © Farlex 2012

frontal lobe

The largest and most anterior part of each cerebral hemisphere.

frontal lobe

The large, foremost part of the brain. This part constitutes about one-third of the brain and is much more fully developed than in any other primate. Damage to the frontal lobe causes general disturbance of thinking, impairment of initiative and spontaneity, loss of strength of personality, and, if the rear part of the lobe is affected, paralysis.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

frontal lobe

the anterior part of each cerebral hemisphere in mammals.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Frontal lobe

The largest, most forward-facing part of each side or hemisphere of the brain.

Mentioned in: Aphasia

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References in periodicals archive

At present, it is considered that the medial temporal lobe (including the entorhinal cortex, the side olfactory cortex, the side hippocampal cortex, and the hippocampus), the prefrontal lobe, and the precuneus are important areas related to episodic memory (12).

A study on changes of the resting-state brain function network in patients with amnestic mild cognitive impairment

[27] Some other studies have found association between schizophrenia risk genes and functional connectivity abnormalities such as the dorsal prefrontal cortex-hippocampus, prefronta - parietal, intrinsic prefrontal cortex, anterior cingulate gyrus-dorsolateral prefrontal lobe, hippocampus-parietalcortex, ventrolateral prefrontal cortex-hippocampus and amygdala-anterior cingulate cortex/ medial prefrontal cortex connectivity in the task state, and the intrinsic DMN connectivity in the resting state.

Research Progress in Biological Studies of Schizophrenia in China in 2017

How might individual differences in attentional control and intelligence be related to normal structural variation in key prefrontal lobe sites?

Attentional control and intelligence: MRI orbital frontal gray matter and neuropsychological correlates

He added that the results did not reveal a significant relationship between enhanced neuronal activation and the increase in the number of driving errors, most likely because the near infrared spectroscopy measurements were recorded from a single site, the prefrontal lobe. ( ANI )

Using hands-free while driving leads to spike in errors on road

The inclusion criterion for the frontal group was the presence of damage in the prefrontal lobe confirmed by neuroimaging and the neuropsychological assessment performed.

Executive attention and personality variables in patients with frontal lobe damage

The significant activation of the prefrontal lobe shows a compensatory recruitment for the cognitive task.

Compensatory neural responses after 36 hours of total sleep deprivation and its relationship with executive control function

The first medically recorded evidence that a prefrontal lobe dysfunction can create a predisposition to violent behavior was noted on Sept.

Brain dysfunctions associated with anti-social and violent behavior

(25) More recently, Norena et al (26) and Weisz et al (27) compared auditory evoked potentials in patients with tinnitus and in healthy controls, and they suggested that tinnitus might occur as the result of a dysfunction in the top-down inhibitory processes that originate in the prefrontal lobe.

Tinnitus and brain activation: insights from transcranial magnetic stimulation

New research shows that the part of the brain responsible for happiness - the left prefrontal lobe - is consistently active in experienced Buddhists, and from September 10-13 visitors will be able to try and follow their example.

Buddhist secrets at peace pagoda

The spot in the brain called the left prefrontal lobe plays a major role in foresight, planning and self control.

Relax and take control

For example, lead's ability to impair function of the prefrontal lobe, where impulsivity is regulated, may be a factor, Needleman says.

The lead effect? (Focus)

Subcortical projections of the prefrontal lobe of the monkey.

Brain Mechanisms and Intelligence. Psychometric g and Executive Function