5 Written questions
5 Matching questions
- The Major Plexuses: LUMBAR PLEXUSES
- Internal Anatomy of Spinal Cord: POSTERIOR(dorsal) GRAY HORNS
- Internal Anatomy of Spinal Cord: LATERAL GRAY HORNS
- Protective Nerve Coverings: ENDONEURIUM
- Internal Anatomy of Spinal Cord: POSTERIOR MEDIAN SULCUS
- a - contain cell bodies and axons of interneurons as well as axons of incoming sensory neurons.
- b - these horns are b/w the anterior and posterior gray horns.
- are present only in the thoracic, upper lumbar, and sacral segments of the spinal cord.
- contain the cell bodies of autonomic motor nuclei that regulate activity of smooth muscle, cardiac muscle, and glands.
- c - 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.
- d - 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.
- e - 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
5 Multiple choice questions
- - the roots of (anterior rami) of spinal nerves L4-L5 & S1-S4 form this plexus.
- this plexus supplies the buttocks, perineum, and lower limbs.
- the largest nerve in the body, the Sciatic Nerve, arises from this plexus, also the Pudendal nerve.
*more info on Pg 602-603
- - two grooves penetrate the white matter of spinal cord and divide it into right and left sides.
- this is a wide groove on the anterior(ventral) side.
- - each spinal nerve is attached to a spinal segment by two roots:
- are sensory nerve fibers that transmit nerve impulses from the periphery into the spinal cord.
*Posterior Dorsal Root Ganglion - contains the cell bodies of the sensory neurons.
- - this pathway includes:
3.) Vestibulospinal Tracts
- they convey nerve impulses that govern automatic movements and help coordinate body movements w/ visual stimuli.
-also maintain skeletal muscle tone, sustain contraction of postural muscles, and play a major role in equilibrium by regulating muscle tone in response to head movement.
- - these tracts are involved with:
1.) Subconscious Proprioception
2.)Posture, balance, and coordination of skilled movements
5 True/False questions
White Matter Columns → - this matter consists of bundles of myelinated axons of sensory neurons, interneurons, and motor neurons.
- also organized into regions called columns:'
1.) Anterior(ventral) white columns
2.) Posterior (dorsal) White columns
3.) Lateral White Columns
-each column contains distinct bundles of axons having a common origin or destination, carrying similar info.
Internal Anatomy of Spinal Cord: GRAY MATTER → - consists mostly of the cell bodies of neurons, neuroglia, unmyelinated axons, dendrites of interneurons and motor neurons.
- nuclei that serve as neural processing centers and origins for certain nerves.
-the gray commissure connects the two sides of the spinal spord.
Protective Nerve Coverings: NERVE FIBER → - the axon and its associated glial cells form this.
- is a process projecting from the cell body of a neuron.
Spinal Nerve Branches: POSTERIOR (dorsal) RAMUS → - this branch reenters the vertebral cavity/canal through the invertebral foramen and supplies the vertebrae, vertebral ligaments, blood vessels of the spinal cordand meninges.
Spinal Nerve Branches: RAMUS → - these are components of the autonomic nervous system(ANS)