Paracentral lobule

The Paracentral Lobule is a part of the brain's cerebral cortex. It is located on the medial surface of each cerebral hemisphere, just above the medial longitudinal fissure. The lobule is named for its position adjacent to the central sulcus, a prominent fissure that separates the frontal lobe and the parietal lobe.

Etymology

The term "Paracentral Lobule" is derived from the Latin words 'para' meaning 'near', 'centralis' meaning 'central', and 'lobulus' meaning 'a small lobe'. Thus, the term literally translates to 'the small lobe near the center'.

Anatomy

The Paracentral Lobule is made up of two parts: the anterior part, which belongs to the frontal lobe, and the posterior part, which belongs to the parietal lobe. The anterior part is involved in motor functions, while the posterior part is involved in sensory functions. The lobule is bordered by the central sulcus on its lateral side and the paracentral sulcus on its medial side.

Function

The Paracentral Lobule plays a crucial role in controlling the motor and sensory innervations of the contralateral lower extremity. This means that the right Paracentral Lobule controls the left lower limb and vice versa. It is also involved in bladder control and sexual functions.

Clinical Significance

Damage to the Paracentral Lobule can result in paracentral lobule syndrome, which is characterized by weakness or paralysis of the contralateral lower limb, urinary incontinence, and loss of sexual function. This syndrome is most commonly caused by a stroke.

See Also

• Cerebral cortex
• Frontal lobe
• Parietal lobe
• Central sulcus
• Paracentral sulcus

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