Flashcards in Lecture 1: Spinal Cord and Spinal Nerves Deck (22):
How many spinal nerves are there?
How many cervical vertebrae are there?
How many cervical spinal nerves are there?
What does each spinal cord segment give rise to?
1 pair of segmented spinal nerves
From where does the first cervical spinal nerve exit the spinal column?
Between the base of the skull and the superior aspect of the first cervical vertebrae?
From where does the C8 spinal nerve leave the spinal column?
Between the inferior aspect of C8 and superior aspect T1.
From where do all of the thoracic, lumbar and sacral nerves leave the spinal column?
They all leave below their corresponding vertebrae. The transition from above to below occurs at the cervical-thoracic junction.
Why is there an enlargement in the cervical region?
Supplies brachial plexus.
What sort of information passes through the dorsal rootlets?
Afferent i.e. sensory
Why is there an enlargement of the lumbar region?
To accommodate the sciatic nerve.
What is the conus medullaris?
The inferior tip of the spinal cord
What is the filum terminale and where does it attach?
Extension of pia mater. Attaches to the conus medullaris proximally and the back of the first coccygeal segment distally.
How is the dura of the spinal cord different to the dura of the brain?
It is a single layer (not double).
How is the pia mater of the spinal cord different to that of the brain?
It forms denticulate ligaments the project outwards and attach to the lateral walls of the inside of the spinal column. Stabilise the spinal cord.
Do the dorsal and ventral rootlets pierce the dura?
No, they take a dura covering with them.
What do spinal ganglia contain.
Cell bodies of sensory dorsal roolets only.
How is an epidural anaethetic different from a spinal.
Epidural - goes into the epidural space and can knock out specific nerves, does not pierce dura mater, generally safer
Spinal - Pierces the dura mater and enters the CSF, pt. must be on tilt table to control distribution of the anaesthetic. More substantial but also more dangerous as the brainstem can be anaesthetised.
Why is the spinal cord not as long as the spinal column?
During development the spinal column develops faster than the spinal cord.
What is contained within the lateral horn of the grey matter of the spinal cord (T1-L2) and (S2-4) only.
Autonomic nervous system.
T1-L2 - sympathetic outflow
S2-4 - pelvic splanchnic nerves
Where in the spinal cord is the ventral grey horn enlarged?
Cervical and lumbosacral enlargments
Where would you find the gracile fascicle and the cuneate fascicle of the spinal cord?
Above T6. Gracile medially and cuneate laterally. Both dorsal.