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cross over to the opposite side at the optic chiasma
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What part of a spinal nerve contains only efferent fibers?
The ventral root of the spinal nerve has the efferent fibers and the dorsal root has the afferent. Prior to joining each other in the spine they each consist of only those fibers.
How does the cochlea of the inner ear help you hear?
The cochlea has hairs cells that ride on the basilar membrane. These hair cells convert the mechanical vibration of sound waves into an electrical signal and excite the auditory nerve's 30 000 fibers. The auditory nerve transports the signal to the brainstem. Since each hair cell is on a different part of the basilar membrane, each hair cell is best excited by a different frequency. Thus, each nerve fiber carries auditory information about a different frequency to the brain.
What nerve sends messages to the brain from the tongue?
The "Lingual Nerve"The lingual nerve is a branch of the mandibular nerve (CN V3), itself a branch of the trigeminal nerve, which supplies sensory innervation to the tongue. It also carries fibers from the facial nerve, which return taste information from the anterior two thirds of the tongue.Source:- http://en.wikipedia.org/wiki/Lingual_nerve
Which cell process are not myelinated?
According to McGraw Hill (please see related link below): Many nerve fibers in the CNS and PNS are unmyelinated. In the PNS, however, even the unmyelinated fibers are enveloped in Schwann cells. In this case, one Schwann cell harbors from 1 -12 small nerve fibers in grooves in its surface. The Schwann cell's plasma membrane does not spiral repeatedly around the fiber as it does in a myelin sheath, but folds once around each fiber and somewhat overlaps itself along the edges. This wrapping is the neurilemma (also called a mesaxon in unmyelinated nerve fibers). Also, gray matter of the brain and dendrites are unmyelinated, while axons are myelinated.
What are the 5 cells located in the occipital lobe?
axons of the ganglion cells leave the eyeball as the optic nerve. At the optic chiasma, the medial fibers of each eye cross over to the opposite side. The fiber tracts formed are called optic tracts. The optic tracts synapse with neurons in the lateral geniculate nucleus of the thalamus, whose axons form the optic radiation, terminating in the visual cortex of the occipital lobe of the brain.
Nerve fibers from the medial aspect of each eye?
Cross over to the opposite side at the chiasma.
What part of a spinal nerve contains only efferent fibers?
The ventral root of the spinal nerve has the efferent fibers and the dorsal root has the afferent. Prior to joining each other in the spine they each consist of only those fibers.
What surrounds each bundle of nerve fibers?
A bundle of nerve fibers is surrounded by perineurium, a connective tissue that wraps around them.
Fibers from the medial side of each eye cross over to the opposite side of the brain at the?
Optic Chiasm
The area where some fibers from the eye cross over to the opposite side is called the?
Each eye contains an optic nerve, as the meet at the optic chiasm, some of the nerve fibers cross over. This sensitive area is referred to as the optic nerve pathway crossover.
What is the function of cerebral peduncles?
Cerebral peduncles are responsible for connecting the cerebrum to the rest of the brain and spinal cord. They contain fiber tracts that carry motor signals from the cerebral cortex to the spinal cord and brainstem. Additionally, they are involved in coordinating voluntary movement and posture.
What is the difference between nerve and neuron?
A neuron is an individual cell in the PNS or CNS that can be excited and conduct impulses along its axon. A nerve is a bundle of multiple neuron fibers that each are carrying their own signals. They are protected by connective tissue. Eventually the neuron fibers diverge away from the nerve to reach their destination.
The canal that runs through the core of each osteon (Haversian system) contains?
Central (Haversian) Canal is the canal that runs through the core of each osteon.
How many nerves are in your eyes?
Each eye has one nerve for vision, the optic nerve, Cranial Nerve II. Nerves are actually bundles of many nerve fibers. There are nerves that supply impulses for the muscles associated with the eyeballs so they can move are the Cranial Nerve III, Oculomotor, Cranial Nerve IV, Trochlear, and Cranial Nerve VI, the Abducens nerve.
What happens when you have 2 cerebral cortex?
You actually have two as the brain is divided into two hemispheres each covered by a cortex and connected by nerve fibers in the corpus callosum.
What is 'modality of sensation'?
Each type of the principal type of sensation that we experience pain , touch, sight ,sound and so forth is called modalities of sensation. We experience these different modalities of sensation, while nerve fibers transmit only impulses. How is it that different nerve fibers transmit different modalities of sensation? 1. Each nerve tract terminates at a specific point in the CNS, and the type of sensation is determined by the point in the nervous system to which the fiber leads. So touch stimulus is carried by nerve impulses in the touch area of the brain. Similarly fibers from the eyes (retina) terminates in the "visual Corteses" of the brain, touch stimuli carried by nerve impulses in the "touch" area of the brain. 2.Moreover, each receptor organ is specialized to receive a particular type of stimuli and this is carried to the particular area of the bran.
Do myelinated nerve fibers conduct signals faster than unmyelinated fibers?
Yes, unmyelinated axons, action potentials are generated at sites immediately adjacent to each other and conduction is relatively slow. Degree of myelination speeds up transmission.
