HUBS 191 Lecture 20 Flashcards
(31 cards)
where does the spinal cord start and finish
it starts at the base of the foramen magnum and ends at the inferior border of the first lumbar vertebrae (L1)
where is the spinal cavity
within the vertebrae
where does the spinal cord sit
within a sac of meninges that is in the spinal cavity
even though the spinal cord ends at the first ____ vertebra the ______ are still coming out at lower levels
lumbar - spinal nerves
how do spinal nerves exit the spinal cord
through canals/gaps
where does the spinal cavity within the vertebrae extend to
the coccygeal vertebrae
the spinal cord extends within a meningeal sac filled with ___
CSF
what is the conus medularis
the end of the spinal cord (a tapered cone) which is composed of fibrous (non-neural) tissue
what is the filum terminale
a structure composed of fibrous tissue that anchors the spinal cord by connecting from the conus medularis to the end of the spinal cavity
how many segments does the spinal cord have
31 segments
how many spinal nerves are associated with each segment
one pair of spinal nerves for each segment
how are spinal nerves named
by the vertebra they exit below with the exception of the first cervical spinal nerve which exits between the skull and first cervical vertebra
there are 7 cervical vertebrae - how many cerviocal spinal nerves are there
8
what is the cauda equina
the large collection of long nerves inferior to the end of the spinal cord
what are sulci and fissures
sulci are furrows and fissures are deep sulci
what does dorsal mean
posterior
what does ventral mean
anterior
what is the central canal
a canal in the middle of the spinal cord filled with CSF (not everyone has this)
is dorsal afferent or efferent
afferent
is ventral afferent or efferent
efferent
how does efferent information leave the spinal cord
through ventral roots
where are somatic motor neurons located
in the ventral horn
where are autonomic neurons located
in the lateral horn
what would happen in there was damage to the ventral horn
the brain would still generate motor commands but they wouldn’t be received meaning there would be no command to the skeletal muscle
