Histology-Fall11 Nervous Tissue

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Author:
catorresdiaz
ID:
108606
Filename:
Histology-Fall11 Nervous Tissue
Updated:
2011-10-12 23:49:43
Tags:
histology lab nervous tissue
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Description:
histology lab nervous tissue
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  1. SPINAL CORD

    Characteristics:
    Shows the white and gray matter, motor neuron cell bodies are visible in the ventral horns of the gray matter as large dark specks.

    Functions: Conducts sensory information from the peripheral nervous system (somatic and autonomic) to the brain conducts motor information from the brain to our various effectors.

    Location: The spinal cord is contained within the spine, extending from the base of the skull to the second lumbar vertebra at the base of the spine.
  2. NEURONAL CELL BODY

    Characteristics:
    The large euchromatic nucleus has a very prominent central nucleolus. The beginnings of three dendrites and the one axon can be seen emanating from this cell body.

    Functions: Electrically excitable cell that processes and transmits information by electrical and chemical signaling. Chemical signaling occurs via synapses, specialized connections with other cells. Neurons connect to each other to form networks.

    Location: Human nervous system.
  3. DORSAL ROOT GANGLION

    Characteristics:
    Neuronal cell bodies are located in the more darkly stained regions, with their axons projecting out into the lighter areas of the tissue. These axons are myelinated and Nodes of Ranvier can be seen.

    Functions: it's a nerve ending that send processes out to the periphery, is a nodule on a dorsal root that contains cell bodies of neurons in afferent spinal nerves.

    Location: The dorsal root ganglia lie along the vertebral column by the spine.
  4. PERIPHERAL NERVE

    Characteristics:
    The perineurium is nicely stained. The cross-sectional appearance of myelinated axons is obvious. The perineurium surrounds the nerve bundle, but does not penetrate it. This is a key criterion for distinguishing peripheral nerve bundles from smooth muscle bundles.

    Functions: The primary function of a peripheral nerve is to transmit signals from the spianl cord to the rest of the body, or to transmit sensory information from the rest of the body to the spinal cord.

    Location: Human nervous system.
  5. CEREBELLUM

    Characteristics:
    The gray matter is located outside (the cerebellum), with the white matter lying inthe middle of many infoldings.

    Function: region of the brian that plays an important role in motor control, it contributes to coordination, precision, muscle tone, balance, and equilibrium.

    Location: the cerebelum is located just above the brainstem, beneath the occipital lobes at the base of the skull.

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