cervical and thoracic Flashcards
how many cervical, thoracic and lumbar vertebra are there?
Cervical: 7
Thoracic: 12
Lumbar: 5
The vertebral column is commonly called what? (2)
spine and spinal column
When the vertebra are stacked on one another the vertebral foramina form what?
spinal canal
The spinal cord is filled with what?
Cerebral spinal fluid
where does the spine start and end ?
at the base of the skull (medulla oblongata) and extends to sacrum
at the lower level of L-1 the spinal cord terminates at the ?
conus medullaris
In some people the conus medullaris can extend as low as ?
L2
To avoid striking the spinal cord,what is a common site for lumbar puncture
L3-L4
what kind of disks separate the adult vertebrae
Fibrocartilage disks
Fibrocartilage disks account for how much of the vertebral column?
about 1/4
what do the fibrocartilage disks do for the vertebrae?
they are bound to the vertebra for spine stability
Intervertebral disks consist of an outer and inner layer called ?
inner: nucleus pulposus
outer: annulus fibrosus
what is a herniated nucleus pulposus?
occurs when the nucleus ruptures and protrdes into the vertebral canal and impinges on a spinal nerve (slipped disk)
Where does a slipped disk normally occur ?
most commonly in the lumbar region
in early life the vertebral column consists of how many bones?
33 irregularly shaped small bones
how are the bones classified
according to the region they occupy
what are the 5 regions of the spine
Cervical, thoracic, lumbar, sacral, coccygeal
Cervical vertebrae consists of
most superior 7 bones in the region of the neck
Thoracic vertebrae consists of
next 12 bones form the mid back region and articular with one of more pair of ribs
older term: dorsal spine
Lumbar vertebrae consists of
next 5 vertebrae forms the lower back. They are the largest and strongest in the column (load of body weight increases toward the inferior end of the column
How many sacral segments does a newborn have? how many coccygeal segments?
5 sacral segments
3-5 coccygeal segments
An adult has how many bones in the vertebral column?
26
Viewed from the side the vertebral column has how many curves that arch posteriorly and anteriorly from the MCP of the body?
4 curves
What is a concave curve?
a rounded inward or depressed surface
what is a convex curve?
is a rounded outward or elevated surface
What sections of the spine have a concave curve?
cervical and lumbar
what sections of the spine have a convex curve?
thoracic and sacral
What are the primary curves of the body (develop soon after birth)
thoracic and sacral
what are the secondary or compensatory curves?
Cervical and lumbar
When does the cervial curve being to develop?
when a child begins to hold the head up at about 3-4 months
when does the lumbar curve begin to form?
when the child beings to walk
what 2 curves are usually more pronounced in women
lumbar and sacral
What do the curves do for us?
serves to increase strength of vertebral column and maintain balance in upright position
what are the abnormalities of the spine?
lordosis, kyphosis, and scoliosis
what does lordosis mean
bent backward-any abnormal increase in the posterior concavity of the lumbar or cervical region
what can also describe the normal concavity of the lumbar and cervical spine
lordosis
what can an abnormal increase in curvature result from?
pregnancy, obesity, poor posture, rickets, and tuberculosis of the spine
what is Kyphosis
any abnormal increase in the posterior convexity of the thoracic curve also known as hunchback
what projection will best show kyphosis?
lateral projection
what can cause kyphosis
may be caused by compression fracture of anterior edges of vertebral bodies in osteoporotic patients
Which way does the spine curve in right and left handed people?
right handed: right
Left handed: left
What is any abnormal curvature of the spine called ?
scoliosis
In a scoliosis patient why does the column develop a second curve in the opposite direction
to keep the head centered over the feet
a typical vertebra is composed of two main parts which are?
body and vertebral arch
What is the body of a vertebra
thick, weight bearing anterior portion of the vertebra (superior and inferior surfaces are covered by a thin plate of articular cartilage
what is the vertebral arch
consists of a ring or arch of bone extending posteriorly from the vertebral body
The body and the arch encloses a space called
vertebral foramen
What is a pedicle?
extend posteriorly from the body and form the sides of the vertebral arch
what does pedicle also mean?
little feet