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Well, there are really only three types of fibers, but they all have different sub-classes to them. A, B, and C. A and B fibers are myelinated, and C fibers are unmyelinated. A fibers are broken down further by conduction velocity into 4 main groups, alpha, beta, gamma, and delta. In general a chart of these fibers would look something like this..
A(alpha), largest and fastest velocity, acts as motor and sensory fibers
A(beta), next largest, acts as motor and sensory.
A(gama), next largest, acts as motor only.
A(delta), next largest, acts as sensory only.
B, smaller than A fibers, only acts a motor.
C, smallest, acts as motor and sensory. In general, the A class of fibers are related to muscles(extrafusal and intrafusal fibers), A(delta) sensory fibers relay touch, pressure, pain, and temp, B motor fibers are for the autonomic system, while C sensory fibers are also for pain and temp. Note. Sometimes the sensory fibers are classified by a roman numeral system from I to IV. They are the same fibers, just numbered differently. They look like this... A(alpha) = Ia
A(alpha) = Ib
A(beta) = II
A(delta) = III
C = IV Hope this helps...
Daniel {| |- | A 1-20 5-120 0.3-0.5 B <4 3-15 1.2 C 0.3-1.5 0.6-2.5 2.0 |}
What else can I help you with?
Do spinal nerves carry only sensory information only motor information or both types of information?
Spinal nerves carry both sensory and motor information. Each spinal nerve is formed from a combination of sensory (afferent) fibers that transmit information from the body to the spinal cord and motor (efferent) fibers that convey signals from the spinal cord to muscles and glands. This dual function allows spinal nerves to facilitate communication between the central nervous system and the rest of the body.
Is true regarding nerve?
Nerves are bundles of fibers that transmit electrical signals between the brain, spinal cord, and other parts of the body. They play a crucial role in relaying sensory information and coordinating motor functions. Nerves can be classified into sensory, motor, and mixed nerves, each serving specific functions in the nervous system. Damage to nerves can lead to a range of neurological issues, affecting sensation, movement, and coordination.
How many thoracic nerves?
thoracic nerves [T1-T12] twelve nerves on each side, mixed motor and sensory, supplying the muscles and skin of the thoracic and abdominal walls.
What is the spinal nerve mad of?
The spinal nerve is composed of both sensory and motor nerve fibers, which are bundles of axons that transmit signals between the spinal cord and the rest of the body. Each spinal nerve emerges from the spinal cord as two roots: the dorsal (sensory) root, which carries sensory information to the central nervous system, and the ventral (motor) root, which transmits motor commands to the muscles. Additionally, spinal nerves contain connective tissue and blood vessels that support and protect the nerve fibers.
What would happen if the anterior ramus of a spinal nerve was damaged or cut?
The ventral rami of the spinal nerves carry sensory and motor fibers for the innervation of the muscles, joints, and skin of the lateral and ventral body walls and the extremities... So there would be some some loss of sensation and muscle function, but not total since the nerve bundles overlap at each level... There are also some autonomic nerves associated.
How many oairs of cranial nerves are there?
There are 12 pairs of cranial nerves, each with specific functions related to sensory, motor, or mixed functions in the head and neck regions.
What is the peripheral nervous system?
It includes nerves arising from brain and spinal cord innervating different parts of the body respectively called as, cranial and spinal nerves. Comprises of all nerves which connect the central nervous system with receptors and effectors. Nerves connecting the receptor organs to the CNS are called sensoryor afferent nerves; they contain sensory fibres only. Nerves connecting the effector organs (muscles and glands) to CNS are motor or efferent nerves; they contain motor fibres only.A third type of nerve, the mixed nerves have both sensory and motor nerve fibres. Nerves connected to brain are called cranial nerves while those connected to spinal cord are spinal nerves. On the basis of presence and absence of myelin sheath around the axons the nerve fibres are myelinated or nonmylinated, respectively.• Each nerve is composed of many nerve fibers enclosed within a connective tissue sheath. A nerv fiber is along axon or dendrite of a neuron, which could be either sensory or motor or both. The periphery of something is its edge, or outside parts.Thus that part of the nervous system which is not designated the Central Nervous System (the brain, spinal chord and retina) would be regarded as the peripheral nervous system. It consists of sensory neurons, clusters of neurons called ganglia, and nerves connecting them to each other and to the central nervous system.
WHAT IS THE DIFFERENCE BETWEEN THE ANTERIOR and POSTERIOR ROOT OF THE SPINAL NERVES?
The cerebrospinal nervous system consists of the brain, spinal cord and the peripheral nerves given off by these to the outer parts of the body. 31 pairs of nerves emerge from the spinal cord. Each nerve has 2 roots - 1 anterior(at the front of the spine) and 1 posterior (at the back of the spine) carrying sensory nerves. Motor nerves carry impulses to the muscles, & have the responsibility for bodily movement. On the other hand, sensory nerves are responsible for carrying sensory impulses which provide the brain with information about sensation i.e. hot and cold.
Why do muscle fibers need to be wrapped and bundled into groups?
So that nerves can send a signal to the bundle instead of each individual fiber.
What would happen if the anterior ramus of spinal nerve was damaged or cut?
The ventral rami of the spinal nerves carry sensory and motor fibers for the innervation of the muscles, joints, and skin of the lateral and ventral body walls and the extremities... So there would be some some loss of sensation and muscle function, but not total since the nerve bundles overlap at each level... There are also some autonomic nerves associated.
The anterior root and the posterior root fuse to form?
Each spinal nerve attaches to spinal cord by a ventral (anterior) root and a dorsal (posterior) root.All spinal nerves are mixed nerves (both motor and sensory).
What is the function of the connector nerves?
the connector nerves are those that connect the sensory and mo tor nerves.we are able to make decisions because the connector nerves gather data from both sensory and the motor nerves more than 99% of the nerve cells in the body are connector nerves,most of wich are concentrated in the brain.Some are also found in the spinal cord.At birth,many nerve cells inthe brain are being connected to each other in many,intricate ways.This is called th wiring of the brain.
