STRUCTURE OF THE CEREBRUM

CEREBRUM

• Consists of two large masses called the left and right cerebral hemispheres.
• They are mirror images of each other.
• The corpus callosum, a broad flat bundle of axons, connects the two hemispheres.
• A layer of dura matter separates them.

CEREBRUM

• The surface of the cerebrum has many ridges called gyri
• They are separated by grooves
• A shallow groove is called a sulcus
• A deep groove is called a fissure

FISSURE

• A longitudinal fissure separates the right and left cerebral hemispheres.
• A transverse fissure separates the cerebrum from the cerebellum.
• Several sulci divide each hemisphere into lobes.

LOBES

• Frontal lobe- forms anterior part
• Parietal lobe- posterior to the frontal lobe and separated by central sulcus
• Temporal lobe- lies below the frontal and parietal lobes and is separated by the central sulcus
• Occipital lobe- forms the posterior part of the cerebral hemisphere and is separated from the cerebellum

CEREBRUM

• Insula- deep in the lateral sulcus and is covered by parts of the frontal, parietal and temporal lobes
• Cerebral cortex- a thin layer of gray matter, the outer most part of the cerebrum covers the gyri and dips into the sulci and fissures
• It contains nearly 75% of all the neuron cell bodies in the nervous system

Untitled Slide