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Axons are also known as nerve neurinome de l acoustique, the function of the axon is to transmit information to different neurons, muscles and glands.

Axon dysfunction has caused many inherited and acquired neurological disorders which can affect both the peripheral and central neurons, nerve fibers are classed into three types — A delta fibers, B fibers, and C fibres.

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A and B are myelinated and C are unmyelinated, an axon is one of two neurinome de l acoustique of protoplasmic protrusions that extrude from the cell body of a neuron, the other type being dendrites.

Axons are distinguished from dendrites by several features, including shape, length, all of these rules have exceptions, however. Axons are covered by a known as axolemma, the cytoplasm of axon is called axoplasm. Some types of neurons have no axon and transmit signals from their dendrites, no neuron ever has neurinome de l acoustique than one axon, however in invertebrates such as insects or leeches the axon sometimes consists of several regions that function more or less independently of each other.

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Most axons branch, in cases very profusely. Axons make contact with other cells—usually other neurons but sometimes muscle or gland cells—at junctions called synapses, at a synapse, the membrane of the axon closely adjoins the membrane of the target cell, and special molecular structures serve to transmit electrical or electrochemical signals across the gap.

Some synaptic junctions appear partway along an axon as it extends—these are called en passant synapses, other synapses appear as terminals neurinome de l acoustique the ends of axonal branches. A single axon, with all its branches together, can innervate multiple parts of the brain.

Axons are the transmission lines of the nervous system. Some axons can extend up to one meter or more while others extend as little as one millimeter, the longest axons in the human body are those of the sciatic nerve, which run from the base of the spinal cord to the big toe of each foot.

The diameter of axons neurinome de l acoustique also variable, most individual axons are microscopic in diameter. Axonal arborization also differs from one nerve fiber to the next, axons in the central nervous system typically show complex trees with many branch points.

Otoneurosurgery - William Pellet, Maurice Cannoni, Andre Pech - Google Livros

In comparison, the granule cell axon is characterized by a single T-shaped branch node from which two parallel fibers extend. Elaborate arborization allows for the transmission of messages to a large number of target neurons within a single region of the brain 3.


Spinal nerves emerge sequentially from the cord with the spinal nerve closest to the head emerging in the space above the first cervical vertebra. The cranial nerves, however, emerge from the nervous system above this level.


Each cranial nerve is paired and is present on both sides, depending on definition in humans there are neurinome de l acoustique or thirteen cranial nerves pairs, which are assigned Roman numerals I—XII, sometimes also including cranial nerve zero. The numbering of the nerves is based on the order in neurinome de l acoustique they emerge from the brain.

The terminal nerves, olfactory nerves and optic nerves emerge from the cerebrum or forebrain, and the ten pairs arise from the brainstem. Most typically, humans are considered to have pairs of cranial nerves.

Cranial nerves are generally named according to their structure or function, for example, the olfactory nerve supplies smell, and the facial nerve supplies motor innervation to the face.

The trigeminal nerve is named in accordance with its three components, and the nerve is named for its wandering course. Cranial nerves are numbered based on neurinome de l acoustique position, when viewing the brain.

If the brain is removed from the skull the nerves are typically visible in their numeric order. Cranial nerves have paths within and outside of the skull, the paths within the skull are called intracranial and the paths outside the skull are called extracranial.


There are many holes in the neurinome de l acoustique called foramina by which the nerves can exit the skull, all cranial nerves are paired, which means that they occur neurinome de l acoustique both the right and left sides of the body.

The muscle, skin, or additional function supplied by a nerve on the side of the body as the side it originates from, is referred to an ipsilateral function. Reading this work makes it abundantly clear that the results of this type of sur gery are vastly improved when neurosurgeons and otologists combine their skills.


Each of these specialists brings his unique experience and entire knowledge to the operation for the greater benefit of the patient. We wish to congratulate Doctors Pellet, Cannoni and Pech on the neurinome de l acoustique of this excellent work. Since the days of Cushing, when partial tumor removal seemed the best method for saving a patient's life, the management of this relatively rare tumor has sparked enormous clinical interest.