Where is spiral ganglion located?
the cochlea
cochlear nerve and auditory pathways …of nerve cell bodies, the spiral ganglion, located in the modiolus of the cochlea. The neurons of the spiral ganglion are called bipolar cells because they have two sets of processes, or fibres, that extend from opposite ends of the cell body.
What part of the brain does the auditory nerve connect to?
Auditory nervous system: The auditory nerve runs from the cochlea to a station in the brainstem (known as nucleus). From that station, neural impulses travel to the brain – specifically the temporal lobe where sound is attached meaning and we HEAR.
Which neurons are responsible for hearing?
The cochlear nerve (also auditory or acoustic neuron) is one of two parts of the vestibulocochlear nerve, a cranial nerve present in amniotes, the other part being the vestibular nerve. The cochlear nerve carries auditory sensory information from the cochlea of the inner ear directly to the brain.
What regulates balance and carries auditory stimuli to the brain?
The inner ear offers a remarkable example of organogenesis, as all of the hair cells and neurons for both hearing and balance, as well as many of the associated non-sensory tissues, arise from a single embryonic source, which is called the otic placode (Barald and Kelley, 2004).
What is spiral ganglion cochlea?
The spiral (cochlear) ganglion is a group of neuron cell bodies in the modiolus, the conical central axis of the cochlea. These bipolar neurons innervate the hair cells of the organ of Corti.
What does spiral ganglion contain?
The spiral ganglion is made up of two types of bipolar sensory neurons. Type I cells make up 90% to 95% of the cells in the spiral ganglion and have radial branches that synapse with only one or two inner hair cells (Fig. 21.4). As many as 20 or more type I radial fibers converge on each inner hair cell.
Is the thalamus part of the auditory cortex?
In human, the primary auditory cortex (3) is located in the temporal area (2) within the lateral sulcus (1). A last relay, before the cortex, occurs in the medial geniculate body (thalamus ); it’s here that an important integration occurs: preparation of a motor response (eg vocal response).
Is the thalamus involved in hearing?
The next stop for sound processing is the thalamus. Located just above the brainstem, the thalamus is the brain’s relay station for incoming sensory information. Then the information travels to the auditory part of the cerebral cortex.
What part of the brain detects sound?
auditory cortex
Auditory information is analyzed by multiple brain centers as it flows to the superior temporal gyrus, or auditory cortex, the part of the brain involved in perceiving sound. In the auditory cortex, adjacent neurons tend to respond to tones of similar frequency.
Which nerve connects the eye to the brain?
the optic nerve
Structure and Function As for the trigeminal nerve, abducens nerve, and facial nerve, they originate from the pons. Interestingly, the optic nerve arises from the optic disc in the eye then enters the brain as opposed to the other cranial nerve that originates in the brain and then exits peripherally.
What neurological conditions cause balance problems?
Causes of Balance Disorders
- decreased blood flow to the brain due to stroke or a chronic condition such as aging.
- traumatic brain injury.
- multiple sclerosis.
- hydrocephalus.
- seizures.
- Parkinson’s disease.
- cerebellar diseases.
- acoustic neuromas and other brain tumors.
What part of the brain controls balance?
cerebellum
The cerebellum is at the back of the brain, below the cerebrum. It’s a lot smaller than the cerebrum. But it’s a very important part of the brain. It controls balance, movement, and coordination (how your muscles work together).