Anatomy Chapter 17: Spinal Cord Structure/Function
Terms in this set (31)
is continuous with the brain and begins at the foramen magnum and terminates between vertebrae L1 and L2. It's suspended within the vertebral canal, an area formed by the vertebral foramina of the cervical, thoracic, and lumbar vertebrae.
has two functions:
1) it caries sensory information to the brain and motor output to nerves
2) it mediates spinal reflexes
process sensory input from and convey motor output to the spinal nerves
PROTECTIVE STRUCTURES AND SPINAL MENINGES
is protected by the bony vertebrae, adipose tissue, spinal meninges, and cerebrospinal fluid.
Adipose tissue cushions the spinal cord and is found within the space between the vertebrae and the meninges, known as the ____.
three connective tissue membranes cover the spinal cord and are continuos with the cranial meninges that protect the brain.
the outer meninx. Tough, single layered membrane that is deep to the epidural space and superficial to the spider web like, arachnoid mater.
the inner meninx. it is delicate and hugs the spinal cord.
lateral extensions of pia mater that diffuse with arachnoid mater and secure the spinal cord.
lies between the pia and arachnoid mater. It contains cerebrospinal fluid, which also cushions the spinal cord.
EXTERNAL FEATURES OF THE SPINAL CORD
31 Pairs of Spinal Nerves
the long, cylindrical spinal cord has _____ attached to it. Each pair of these arise from a different segment of the cord
located at levels C3 or C4 through T1. This bulge designates the location of nuclei (collection if neuron cell bodies) for upper extremities.
located at levels T9 through T12 and contains nuclei for the lower extremities
The spinal cord ends here inferiorly between vertebral levels L1 and L2.
group of nerves arising from the inferior portion of the spinal cord continue inferiorly. This term means "horse's tail".
an extension of the pia mater continues past the conus medullaris and connects the inferior end of the spinal cord to the coccyx.
TRANSVERSE SECTION OF THE SPINAL CORD
Anterior Median Fissure
wide, deep groove on the anterior surface of the spinal cord
Posterior Median Sulcus
narrow groove on the posterior surface of the spinal cord
looks like a butterfly or a modified "H" and is more centrally located than the white matter. This is divided into the anterior, lateral, and posterior gray horns and consists of nerve cell bodies and dendrites.
Anterior (ventral) Gray Horns
somatic neuron cell bodies are located here
Lateral Gray Horns
(not present in cervical cord segments) contain cell bodies of autonomic motor neurons
Posterior (dorsal) Gray Horns
contain neuron cell bodies that receive impulses from sensory neurons
narrow bridge of gray matter that connects the right and left sides of gray matter in the middle of the spinal cord.
located in the center of the gray commissure and contains cerebrospinal fluid
surrounds the gray matter and forms the anterior, lateral, and posterior white columns. These columns or funiculi are made up of white, myelinated fibers (axons) that are going to and leaving the spinal cord.
Posterior Dorsal Root
carries the sensory fibers, wheras the anterior ventral root carries motor fibers.
the sensory and motor nerves that merge to form the spinal cord
Posterior (dorsal) Root Ganglion
consists of somatic sensory neuron cell bodies that synapse onto interneuron and/or motor neuron cell bodies in the spinal gray matter
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