Lecture 20: Anatomy and Function of the Spinal Cord and Spinal Nerves Flashcards
Where do fibers originate in the craniosacral autonomic nervous system
In the brain stem or the sacral spinal cord
Where do fibers originate in the Thoracolumbar autonomic nervous system
In the thoracic and lumbar spinal cord
What is the foramen magnum and where is it found
The big hole at the base of the skull.
Where is the spinal cord found?
Within a sac, made of meninges, that fits inside the spinal cavity (spinal cavity within vertebrae)
Where does the spinal cord start and end
Starts at Foramen magnum and ends at the inferior border of 1st Lumbar vertebra
Where does the spinal cavity start and end
Foramen magnum and extends to coccygeal
What is the conus meduliaris
A non-neural tissue at the end of the spinal cord.
Attachment point for filum terminale
What is the Filum terminale (and function)
A fbrous, non-neural tissue that extends from conus medularis to end of spinal cavity
Anchors the spinal cord
How many segments does the spinal cord have
31
8 Cervical spinal nerves
12 Thoracic spinal nerves
5 Lumbar spinal nerves
5 Sacral spinal nerves
1 Coccygeal spinal nerves
How many cervical spinal nevers and vertebrae
8 spinal nerves but 7 cervical vertebrae
Where does the first cervical spinal nerve exit?
The first cervical spinal nerve exits
between the skull and the first cervical vertebra.
What fluid is in the spinal cord
Cerebral spinal fluid
What is the Cauda Equina
Horses tail. It is the collection of long nerves inferior to end of spinal cord
What is white matter in the spinal cord made of
axons
What is white matter in the spinal cord made of
cell bodies
what does sulcus mean
furrow
What is a fissure
a deep sulcus
Which half of the spinal cord is responsible for sensory (afferent) information?
The dorsal side
Which half of the spinal cord is responsible for motor (efferent) information?
Ventral side
Where does efferent information leave the spinal cord
Through the ventral roots
where are somatic motor neurons (cell bodies) found in the spinal cord
In the ventral horn
where are autonomic motor neurons (cell bodies) found in the spinal cord
In the lateral horn
Where are cell bodies of sensory neurons found in the spine
In the dorsal root ganglion
