Paracentral lobule

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Paracentral lobule
Sobo 1909 624 - Paracentral lobule.png
Medial surface of left cerebral hemisphere. (Paracentral lobule is shown in red.)
Cerebral Gyri - Medial Surface1.png
Medial view of a halved human brain (Paracentral lobule labeled at top center, in blue.)
Details
Latin lobulus paracentralis
Identifiers
Gray's p.822
NeuroNames ancil-404
Dorlands
/Elsevier
l_13/12500890
TA A14.1.09.209
FMA FMA:77534
Anatomical terms of neuroanatomy

Paracentral lobule is on the medial surface of the hemisphere and is the continuation of the precentral and postcentral gyri. The paracentral lobule is supplied blood by the anterior cerebral artery. The paracentral lobule controls motor and sensory innervations of the contralateral lower extremity. It is also responsible for control of defectation and urination.

It includes portions of the frontal and parietal lobes:[1]

  • The anterior portion of the paracentral lobule is part of the frontal lobe and is often referred to as the supplementary motor area.
  • The posterior portion is considered part of the parietal lobe and deals with somatosensory of the distal limbs.

While the boundary between the lobes, the central sulcus, is easy to locate on the lateral surface of the cerebral hemispheres, this boundary is often discerned in a cytoarchetectonic manner in cases where the central sulcus is not visible on the medial surface.

Function[edit]

Neurons in paracentral lobule are concerned with:

  1. Motor and sensory innervations of the contralateral lower extremity
  2. Regulation of physiological function such as defecation and micturition

Blood supply[edit]

It is supplied by branches of the anterior cerebral artery.

Applied anatomy[edit]

Damage of paracentral lobule occurs from occlusion of anterior cerebral artery. Characteristic manifestations include:

  • Contralateral lower limb muscle weakness
  • Urinary incontinence

Gallery[edit]

References[edit]

  1. ^ Neuroscience in medicine. Totowa, NJ: Humana Press. 2003. p. 348. ISBN 1-58829-016-6. 

External links[edit]