Neurology Book



Parietal Lobe

Aka: Parietal Lobe, Parietal Lobe Function, Cerebral Parietal Lobe, Homunculus, Primary Somatosensory Cortex, Primary Somesthetic Area, Brodmann Area 3 1 2, Secondary Somatosensory Cortex, Secondary Somesthetic Area, Brodmann Area S2, Superior Parietal Lobule, Brodmann Area 5, Visuo-Motor Coordination Area, Brodmann Area 7, Angular Gyrus, Brodmann Area 39, Supramarginal Gyrus, Brodmann Area 40
  1. Anatomy: Brodmann Areas of Parietal Lobe
    1. Primary Somatosensory Cortex or Somesthetic Area (Area 3,1,2)
      1. Lesions in this region affect contralateral sensory loss in light touch and proprioception
      2. Pain and Temperature sense are received in a region inferior to Area 3,1,2, known as the Secondary Somesthetic Area.
    2. Secondary Somatosensory Cortex or Somesthetic Area (Area S2)
      1. Lesions in this region affect pain and Temperature sense
      2. These fibers are inferior to Primary Somesthetic Area (Area 3,1,2)
    3. Superior Parietal Lobule (Anterior, Area 5)
      1. Involved in spacial orientation
    4. Visuo-Motor Coordination (Posterior, Area 7)
      1. Involved in spacial orientation
    5. Angular Gyrus (Area 39)
      1. When in the dominant hemisphere, a lesion in the Angular Gyrus affects the ability to read (alexia) and write (agraphia).
    6. Supramarginal Gyrus (Area 40)
      1. Dominant hemisphere lesions in the Supramarginal Gyrus cause Agnosia of tactile Sensation and proprioception
      2. The patient may have difficulty with left-right discrimination and Apraxia (difficulty with skilled movement)
      3. It also affects the interpretation of gestures made by other people.
  2. Physiology: Homunculus
    1. Homunculus is a graphical representation of sensory and motor control
    2. Man standing at the midline between the two Cerebral Hemispheres
      1. Legs are above the falx cerebri at the medial Parietal Lobe (Anterior Cerebral Artery)
      2. Legs are relatively small compared to arms and head
        1. Represents fewer overall Neurons dedicated to leg motor and sensory control
    3. Man is bending at the waist over the top of the Parietal Lobe
      1. Legs and head extend over the lateral Parietal Lobe (Middle Cerebral Artery)
      2. Arms and head are relatively large
        1. Represents greater overall Neurons dedicated to arm/head motor and sensory control
  3. Signs: Brain Lesions
    1. Receptive Aphasia
    2. Sensory loss
    3. Spatial Disorientation
    4. Hemianopia
  4. Exam
    1. Cognitive Dominant
      1. Names fingers
      2. Knows left and right
      3. Performs calculations on paper
      4. Reading
    2. Cognitive Non-Dominant
      1. Constructs copy of matchstick figure made by examiner
  5. References
    1. Newton (1994) Am Fam Physician 49(4): 787-97 [PubMed]

Parietal Lobe (C0030560)

Definition (FMA) Parietal lobe is the one of five lobes of the cerebral hemisphere which occupies the dorsal-posterior portion of the hemisphere. It is bounded by the central sulcus on its anterior border and and by the longitudinal cerebral fissure on its medial border. Posteriorly it shares an arbitrary border with the occipital lobe.
Definition (NCI_CDISC) One of the lobes of the cerebral hemisphere located superiorly to the occipital lobe and posteriorly to the frontal lobe. Cognition and visuospatial processing are its main function. (NCI)
Definition (NCI) One of the lobes of the cerebral hemisphere located superiorly to the occipital lobe and posteriorly to the frontal lobe. Cognition and visuospatial processing are its main functions.
Definition (MSH) Upper central part of the cerebral hemisphere. It is located posterior to central sulcus, anterior to the OCCIPITAL LOBE, and superior to the TEMPORAL LOBES.
Concepts Body Part, Organ, or Organ Component (T023)
MSH D010296
SnomedCT 16630005
English Parietal Lobes, Lobe, Parietal, Lobes, Parietal, Parietal Lobe, Tissue of parietal lobe brain, Tissue of parietal lobe of brain, Parietal cortex, Regio parietalis, Parietal region, parietal lobes, lobe parietal, parietal region, parietal cortex, parietal lobe, PL, Lobus parietalis, Parietal lobes, PARIETAL LOBE, Parietal Regions, Parietal Cortex, Cortex, Parietal, Parietal Region, Regions, Parietal, Parietal Cortices, Region, Parietal, Cortices, Parietal, Parietal lobe, Parietal lobe structure (body structure), Parietal lobe structure, Parietal lobe, NOS, Parietal Lobe of the Brain, lobus parietalis
Swedish Hjässlob
Czech parietální lalok
Finnish Päälakilohko
Croatian Not Translated[Parietal Lobe]
Polish Płat ciemieniowy
Norwegian Lobus parietalis, Parietallapp, Isselapp
Spanish estructura del lóbulo parietal (estructura corporal), estructura del lóbulo parietal, lóbulo parietal, Lóbulo Parietal
French Lobe pariétal
German Parietallappen, Scheitellappen
Italian Lobo parietale
Dutch Lobus parietalis (cerebri), Kwab, pariëtaal-, Pariëtaalkwab
Portuguese Lobo Parietal
Derived from the NIH UMLS (Unified Medical Language System)

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