week 5 - AUTONOMIC SYSTEM Flashcards
5 regions of the spinal cord
cranial, thoracic, lumbar, sacral, coccyx
how many cranial nerves in each region
cranial = 8
thoracic = 12
lumbar = 5
sacral = 5
coccygeal = 1
where does spinal cord end in adults and children
L1 + L2 adults and L4 in children
where does spinal cord terminate
conus modularise
where is spinal cord anchored
coccyx by the filum terminale
dorsal roots
contain axons of sensory neurons
ventral roots
- contain axons of motor neurons
spinal nerves
formed by united ventral and dorsal roots and are classified as mixed nerves
both dorsal and ventral roots
- connected to the lumbar, sacral and coccygeal regions
- emerge from the vertebral column to form the peripheral nerves
dorsal root ganglion
contain the cell bodies of sensory neurons
protection of the spinal cord
- vertebral column
- cerebrospinal fluid (also nourishes neural tissue and removes waste products)
- spinal meninges
structure of spinal meninges
- pia meter
- arachnoid mater
- dura mater
internal anatomy of spinal cord
divided into the posterior (dorsal) median sulcus and anterior (ventral) median fissure
gray and white comissue
the site where axons cross from one side of the CNS to another
- part of gray matter of spinal cord
gray matter of spinal cord
composed of mostly neuron cell bodies - unmyelinated axons