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5 Written Questions

5 Matching Questions

  1. Spinal Nerve Branches: ANTERIOR (ventral) RAMUS
  2. Sensory&Motor Tracts: MOTOR OUTPUT
  3. The Major Plexuses: LUMBAR PLEXUSES
  4. Brachial Plexus: AXILLARY NERVE
  5. Meninges: ARACHNOID MATER
  1. a - the roots (anterior rami) of spinal nerves L1-L4 form this plexus.
    - there is minimal intricate intermingling of fibers in this plexus.
    -this plexus supplies the anterolateral abdominal wall, external genitals, and part of the lower limbs.
    - the Femoral & Obturator nerve arise from this plexus.
    *more info on pg 600-601
  2. b - this is the middle meninx(meninges), and is an avascular covering.
    - is connective tissue that resembles a spider webs arrangement of collagen fibers and some elastic fibers.
    - deep to Dura Mater.
    *Subdural Space - is a space b/w dura mater and arachnoid mater, which contains interstitial fluid.
  3. c - motor output to skeletal muscles travels down the spinal cord in two types of descending pathways:
    1.) Direct
    2.) Indirect
  4. d - this is a somatic branch that runs in the musculoskeletal wall of the body.
    - this branch serves the muscles and structures of the upper and lower limbs and the muscles and skin of the lateral and anterior regions of the trunk.
  5. e - this nerve supplies the deltoid muscles and teres minor muscles.

5 Multiple Choice Questions

  1. - include the Gracile Fasciculus and Cuneate Fasciculus, which carry nerve impulses for several kinds of of sensations that includes:
    1.) Proprioception - awareness of positions/movements of muscles, tendons, and joints
    2.) Discriminative Touch
    3.) Two-Point Discrimination - ability to distinguish touching of two diff points on the skin
    4.) Light Pressure Sensations -
    5.) Vibration Sensations
  2. - arises from the conus medullaris.
    - is an extension of the pia mater that extends inferiorly and blends with the arachnoid mater and dura mater to anchor spinal cord to coccyx.
  3. - the spinal nerve trunk runs for a short distance before branching into two large branches and a variable series of smaller branches, each large branch is called a??
    -this branch follows a specific course to different peripheral regions.
    -the 2 larges branches are:
    1.) Anterior (ventral) Ramus
    2.) Posterior (dorsal) Ramus
  4. - this is a somatic branch that runs in the musculoskeletal wall of the body
    - this branch serves the deep muscles and skin of the posterior surface of the trunk.
  5. - each nerve fiber sits in this loose connective tissue.
    - consists of of a mesh of collagen fibers, fibroblast's, and macrophages surrounded by endoneurial fluid (extracellular fluid) derived from the capillaries.
    - this fluid nourishes the neuron and provides the necessary environment for its function of propagating action potentials.

5 True/False Questions

  1. Sensory&Motor Tracts: INDIRECT PATHWAYS- this pathway includes:
    1.) Lateral Corticospinal
    2.) Anterior Corticospinal
    3.) Corticobulbar Tracts
    - they convey nerve impulses that originate in cerebral cortex destined to cause precise, voluntary movements of skeletal muscle.


  2. Internal Anatomy of Spinal Cord: POSTERIOR MEDIAN SULCUS- two grooves penetrate the white matter of the spinal cord and divide it into right and left sides.
    - this is a narrow groove on the posterior (dorsal) side.


  3. Internal Anatomy of Spinal Cord: ANTERIOR(ventral) GRAY HORNS- contain cell bodies and axons of interneurons as well as axons of incoming sensory neurons.


  4. White Matter Columns- each column contains bundles of nerve fibers that may extend up or down the spinal cord called tracts.
    * Sensory (Ascending) Tracts - consist of axons that conduct nerve impulses from the spinal cord toward the brain.
    *Motor (Descending) Tracts - consist of axons that carry nerve impulses away from the brain down the spinal cord.
    -both tracts are continuous w/ sensory and motor tracts of the brain.


  5. Internal Anatomy of Spinal Cord: NUCLEI- these are clusters of neuronal cell bodies, as functional groups.
    *Sensory Nuclei - receive input from receptors via sensory neurons.
    *Motor Nuclei - provide output to effector tissues via motor neurons


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