5 Written Questions
5 Matching Questions
- Spinal Nerve Branches: ANTERIOR (ventral) RAMUS
- Sensory&Motor Tracts: MOTOR OUTPUT
- The Major Plexuses: LUMBAR PLEXUSES
- Brachial Plexus: AXILLARY NERVE
- Meninges: ARACHNOID MATER
- 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
- 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.
- c - motor output to skeletal muscles travels down the spinal cord in two types of descending pathways:
- 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.
- e - this nerve supplies the deltoid muscles and teres minor muscles.
5 Multiple Choice Questions
- - 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
- - 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.
- - 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
- - 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.
- - 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
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.
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.
Internal Anatomy of Spinal Cord: ANTERIOR(ventral) GRAY HORNS → - contain cell bodies and axons of interneurons as well as axons of incoming sensory neurons.
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.
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