Definition

1. Noun:
   • A major groove in the brain: The parieto-occipital fissure is a deep, prominent sulcus (groove) located on the medial (inner) surface of each cerebral hemisphere of the brain.
   • An anatomical landmark: Its primary function is to serve as a clear boundary that separates two major regions of the cerebrum: the parietal lobe (involved in sensory processing and spatial awareness) from the occipital lobe (primarily responsible for visual processing).

Usage Examples

• Noun:
  • The neurosurgeon carefully identified the parieto-occipital fissure to plan the surgical approach.
  • In the MRI scan, the parieto-occipital fissure is clearly visible as a deep groove between the lobes.
  • Damage to the cortex near the parieto-occipital fissure can result in complex visual-spatial deficits.

Advanced Usage

• "Parieto-occipital sulcus": This is a synonymous term. "Fissure" and "sulcus" are often used interchangeably in neuroanatomy for major grooves, though "fissure" typically denotes the deepest ones.
• In anatomical descriptions, it is often referenced in relation to other landmarks:

Variants and Related Words

• Parieto-occipital sulcus (n): A direct synonym for the parieto-occipital fissure.
• Parietal lobe (n): The brain lobe anterior to (in front of) the fissure.
• Occipital lobe (n): The brain lobe posterior to (behind) the fissure.
• Calcarine fissure/sulcus (n): A major fissure in the occipital lobe involved in vision, which often meets the parieto-occipital fissure.

Synonyms

• Parieto-occipital sulcus

Notes on Meaning

• This term is highly specific to the field of neuroanatomy. It is not used in everyday language.
• It refers to a specific, named anatomical structure, not a general type of fissure.

Noun

1. a sulcus near the posterior end of each hemisphere that separates the parietal lobes and the occipital lobes in both hemispheres