AP05 - spinal collumn Flashcards
how are the vertebra divided?
C7, T12, L5, S5, coccyx
What kind of nerves are spinal nerves?
mixed peripheral nerves
What is the space between vertebra?
intervertebral foramina
Where does the spinal cord terminate on a newborn?
L3
How does the spinal cord change over time?
It undergoes foreshortening, to L1 in adults
Where does the spinal nerve start?
Where dorsal and ventral roots converge
What is different about cervical spinal nerves?
they leave above the respective vertebra
What sorts of rami are there?
Meningeal ramus (purely sensory) Dorsal ramus Ventral ramus (unites again toform plexuses)
Where is the cervical plexus from? What does it do?
It originates from C3-C5, and innervates neck muscles
What does the brachial plexus do?
supplies the upper limb
What supplies the lower limb?
The Lumbosacral plexus
How do sensory afferents reach the spinal cord?
enter the dorsal rootlets and have their cell bodies in the dorsal root ganglion
They will then synapse, or pass through the dorsal horn
Where are the cell bodies of sometic motor fibres?
in the ventral horn
What is the difference between a dermatome and a myotome
A dermatome is a portion of skin which receives sensory supply from a single dorsal root, where a myotome is a section of muscle which receives innervation from a single ventral root
What is the cauda equina?
collection of nerves inferior to the conus medullaris
