5 Written Questions
5 Matching Questions
- Sensory&Motor Tracts: SPINOTHALAMIC TRACTS-Lateral & Anterior
- Internal Anatomy of Spinal Cord: ANTERIOR MEDIAN FISSURE
- Meninges: PIA MATER
- Meninges: DURA MATER
- Brachial Plexus: MUSCULOCUTANEOUS NERVE
- a - this nerve supplies the anterior muscles of the arm.
- b - this is the innermost meninx (meninges).
- is a thin transparent connective tissue layer that adheres to the surface of the spinal cord and brain.
- consists of thin squamous to cuboidal cells w/in interlacing bundles of collagen fibers and some elastic fibers.
- contains many blood vessels that supply oxygen and nutrients to the spinal cord.
*Subarachnoid Space - this is the space b/w the arachnoid mater and pia mater. contains cerebral spinal fluid that serves as shock absorber and suspension system for spinal cord and brain.
- c - this is the most superficial of the 3 spinal meninges, and is composed of dense irregular connective tissue.
- forms a sac from the level of the foramen magnum to the 2nd sacral vertebral.
*Epidural Space - is a space b/w the dura mater and wall of the vertebral canal, filled w/ a cushion of fat and connective tissue that protects the spinal cord.
- d - 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.
- e - these tracts convey nerve impulses for sensing pain, temperature, itching, tickling, deep pressure, and a crude, poorly localized sense of touch.
Lateral: sense Pain and Temperature
Anterior: sense Crude touch and Deep Pressure
5 Multiple Choice Questions
- - contain somatic motor nuclei, which are clusters of cell bodies of somatic motor neurons that provide nerve impulses for contraction of skeletal muscles.
- - 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.
- - 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
- - 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
- - this is the outer connective tissue sheath, that bundles all the fasciculi together to form a single nerve.
- consists of fibroblasts and thick collagen strands that mainly parallel the axis of the nerve.
- this sheath gives the nerve the necessary tensile strength to resist the tensile forces than can damage the nervous tissue.
5 True/False Questions
Internal Anatomy of Spinal Cord: POSTERIOR(dorsal) GRAY HORNS → - contain cell bodies and axons of interneurons as well as axons of incoming sensory neurons.
The Major Plexuses: CERVICAL PLEXUS → - this plexus is formed by the roots of the first four cervical nerves(C1-C4), there is one on each side of neck.
- supplies the skin and muscles of the head, neck, and superior part of the shoulders and chest.
-Phrenic nerves arise from this plexus, and supply motor fibers to diaphram.
External Anatomy of Spinal Cord: TWO ENLARGEMENTS → - from an exterior view of the spinal cord, two enlargements can be seen:
1.) Cervical Enlargement - is the superior enlargement that extends from C4-T1. Nerves to and from the upper limbs arise from this enlargement.
2.) Lumbar Enlargement - is the inferior enlargement, extends from T9-T12. Nerves to and from the lower limbs arise from here.
External Anatomy of Spinal Cord: SPINAL CORD → - roughly cylindrical, is flattened slightly anteriorly and posteriorly.
- extends from the medulla oblongata to the sue the superior border of the 2nd lumbar vertebrae.
-also known as a mass nerve tissue located in the vertebral canal from which 31 pairs of spinal nerves originate.
External Anatomy of Spinal Cord: CAUDA EQUINA → - these are the roots of spinal nerves emerging from the lower part of the spinal cord.
- may resemble fine hairs such as "horse's tail"