Anatomy (CNS) · MU Sofia

164. Structure of the cerebral cortex. Cytoarchitectonics.

Describes the six layers of the cerebral cortex, taken in order from the outer molecular layer to the deepest multiform layer. For each layer it notes the main cell types, the connections it receives or sends, and its likely function, such as thalamic input in the internal granular layer and subcortical output from the large pyramidal layer. A labelled picture of the layers is included.

Inside: 1 section · 1 labelled picture · 10 flashcards · 2 min

Topic 21 of 34 in the MU Sofia syllabus for Anatomy (CNS) (Medicine, Year 2). The free AceMed note covers it in 1 section, about 237 words (2 min of reading), with 10 flashcards.

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  1. CEREBRAL CORTEX STRUCTURE

CEREBRAL CORTEX STRUCTURE

The cerebral cortex is the outer layer of the brain and is highly convoluted, forming the characteristic gyri and sulci. It is involved in various complex functions such as sensory perception, motor control, and higher cognitive processes. The histological structure of the cerebral cortex is organized into six distinct layers, known as cortical layers or laminae. These layers vary in cellular composition, density, and function.

1. Molecular Layer (Layer I):

Composition:Sparse in neurons but rich in axons, dendrites, and glial cells

Contains few scattered inhibitory interneurons.

Function: Integrates inputs from various sources.

2. External Granular Layer (Layer II)

Contains small granule cells, pyramidal cells, and a moderate number of inhibitory interneurons.

Function :Receives inputs from other cortical areas.

3. External Pyramidal Layer (Layer III):

Comprised mainly of pyramidal neurons, which have a triangular cell body and apical dendrite extending towards the outer surface.

Contains some interneurons.

Function: Sends projections to other cortical areas.

4. Internal Granular Layer (Layer IV)::

Rich in granule cells and stellate cells (smaller excitatory neurons)

Receives thalamic inputs.

Functions:Processes sensory information.

5. Internal Pyramidal Layer (Layer V)

Contains large pyramidal neurons.

Has projections to subcortical structures (e.g., brainstem and spinal cord).

Function: Involved in motor control and sending outputs to subcortical structures.

6. Multiform Layer (Layer VI):

Comprised of various neuron types, including pyramidal neurons and inhibitory interneurons.

Sends projections to the thalamus.

Functions Modulates thalamic activity and participates in cortico-thalamic feedback loops.

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