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The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

Lobes of the Cerebrum

Lobes of the Cerebrum

The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

Anatomy of the Ear

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

Cerebral Hemispheres

Cerebral Hemispheres

The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...

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Related Experiment Video

Updated: Jun 11, 2026

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits

Published on: July 12, 2022

Laminar and columnar auditory cortex in avian brain.

Yuan Wang¹, Agnieszka Brzozowska-Prechtl, Harvey J Karten

¹Department of Neurosciences, School of Medicine, University of California San Diego, La Jolla, CA 92093-0608, USA. wangyuan@uw.edu

Proceedings of the National Academy of Sciences of the United States of America

|July 10, 2010

Summary

This summary is machine-generated.

Neocortical lamination and columnar organization, once thought unique to mammals, are also found in avian auditory brains. This suggests these complex brain features evolved earlier than previously assumed.

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Last Updated: Jun 11, 2026

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits

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Published on: July 12, 2022

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Published on: June 9, 2017

Area of Science:

Neuroscience
Comparative Anatomy
Evolutionary Biology

Background:

The mammalian neocortex is crucial for complex cognition, featuring distinct lamination and radial columns.
The evolutionary origins and non-mammalian homologs of neocortical organization remain poorly understood.
Previous assumptions suggested neocortical cell types and circuits are unique to mammals.

Purpose of the Study:

To investigate the presence of neocortical features in non-mammalian brains.
To compare avian forebrain organization with mammalian neocortical structures.
To explore the evolutionary history of brain structures underlying higher cognitive functions.

Main Methods:

Utilized a highly sensitive tracer injected into specific layers of the avian (Gallus gallus) auditory telencephalon.
Employed anterograde and retrograde transportable markers to trace neuronal interconnections.
Performed intracellular filling of individual neurons to visualize axonal morphology and columnar organization.

Main Results:

Demonstrated comparable columnar functional modules within the laminated auditory telencephalon of Gallus gallus.
Revealed extensive interconnections across layers and within radial columns, perpendicular to the laminae.
Identified common cell types in birds and mammals that form the basis of these columnar modules.

Conclusions:

Laminar and columnar properties of the neocortex are not exclusive to mammals.
These organizational principles may have evolved from ancestral vertebrate brain structures.
Comparative analysis of brain pathways reveals insights into the phylogenetic origins of cognitive functions.