Flashcards in Unit 1: Lecture 9 Deck (27):
The spinal cord is a collection of...
- neuron cell bodies
- glial cells
Segments mark point of...
exit for the spinal nerves
How many spinal segments?
Split up the 31 spinal segments:
Cervical - 8
Thoracic - 12
Lumbar - 5
Sacral - 5
Coccyx - 1
How many pairs of spinal nerves?
Spinal nerve is comprised of...
a DORSAL root and a VENTRAL root
What nerves are formed immediately after the spinal nerve is formed?
Groupings of peripheral nerves are called...
Four different plexi that are formed directly from spinal nerves:
1. Cervical plexus (C1 - C4)
2. Brachial plexus (C5 - T1)
3. Lumbrosacral plexus (L1 - S4)
4. Coccygeal plexus (S4, S5, and 1st Coccygeal)
How long is adult spinal cord?
~ 2 ft
Where does spinal cord begin and end?
Begins at foramen magnum and ends are conus medullaris
Where is conus medullaris found?
At the L1-L2 intervertebral disc
While the spinal cord doesn't run the length of the vertebral column, the _________ ends at S2 and contains __________
Dura mater; cerebrospinal fluid
- C5 - T1
- Brachial plexus found here
- L1 - S4
- Lumbrosacral plexus found here
- Cauda equine formed from rootlets of lumbrosacral plexus
Ligamentous structure that anchors inferior tip of spinal cord to the coccyx
Filum terminal composed of...
glial cells and pia mater
Meninges (deep to superficial)
- Denticulate ligaments (21 pairs)
- Subarachnoid Space (between arachnoid and pia)
- Epidural space (between Dura and vertebral canal)
- Myelinated axons
- makes up EXTERNAL portion of spinal cord
- composed of neuron cell bodies
- forms "butterfly"
Splits in the spinal cord (dorsal median sulcus & ventral median fissure)
Dorsal root ganglia are located in the...
intervertebral foramina of the vertebral column
Posterior spinal arteries
Paired, derived from vertebral arteries, running posteriorly.
Supply 1/3 of spinal cord
Anterior spinal artery
Singular, derived from vertebral arteries, runs anteriorly (anterior median fissure)
Larger than either of the posterior spinal arteries
Supplies lower 2/3
Segmental spinal arteries on either side of spinal cord.
Each divides into an anterior & posterior radicular artery, which joins the anterior and posterior spinal artery, respectively.
Great Anterior Medullary Artery of Adamkiewicz
Unilateral artery, generally entering the spinal cord from the left side in the lower thoracic region