Flashcards in Spinal cord & spinal nerves Deck (51)
What does the spinal cord do?
- conducts or transmits sensory impulses from the body to the brain
- conducts motor impulses from the brain to the body
- controls reflex action
What is the epidural space?
fairly large space filled with adipose tissue that acts as a buffer around the spinal cord
What are meninges?
membranes that surround the brain and spinal cord
What protects the spinal cord?
spinal vertebrae, meninges, and epidural space
What are the 3 types of meninges?
1. Dura mater- subdural SPACE filled with INTERSTITIAL fluid that anchors and protects
2. Archnoid mater- subarchnoid SPACE filled with CSF
3. Pia mater- thin MEMBRANE that follows the contour of the brain and spinal cord
Whats the Dura Mater?
subdural SPACE filled with INTERSTITIAL fluid that anchors and protects
What is the Archnoid mater?
subarchnoid SPACE filled with CSF
What is the Pia mater?
thin MEMBRANE that follows the contour of the brain and spinal cord
Pia mater is the most _______ of the meninges.
central or deep
The arachnoid mater is ______ to the pia mater.
THe dura mater is the most _______ meninges on the spinal cord.
How long is the typical spinal cord?
42-45 cm long
What is the foreman magnum?
the hole where the spinal cord attaches to the brain
Which vertebrae does the spinal cord reach to as an infant and as an adult?
adult - L1
When does the growth of the spinal cord stop?
What makes the cervical enlargement and the lumber enlargement, enlarged?
there is an increase of nerve tissue
Define conus medullaris
cone shaped end of spinal cord
Define cauda equina
the dorsal ventral roots of lowest spinal nerves
Define filum terminale
thread-like extension of the pia mater that stabalizes spinal cord in spinal canal
What is a sulcus?
Is the sulcus of the spinal cord on the ventral or dorsal side?
sulcus is on the dorsal side
Is the Fissure of the spinal cord on the ventral of dorsal side?
fissure is on the ventral side
What are the 2 spinal nerve roots that emerge from the spinal cord?
- dorsal root (sensory)
- ventral root (motor)
What kind of fibres does the dorsal root have?
sensory fibres in the dorsal root
What kind of fibres does the ventral root have?
motor fibres in the ventral root
What is the dorsal root ganglion?
contains cell bodies of sensory neurons
What neuroglial cells protect by wrapping themselves around the dorsal root ganglion?
What is the motor tract?
- descending tract
- has pyramidal (direct) and
- has extrapyramidal tracts (indirect)
What are sensory tracts
- ascending tracts
- dorsal columns