session 3: neck/abdo/face/back Flashcards
how many vertebrae are there in total?
24
how many cervical vertebra are there?
7
how many thoracic vertebra are there?
12
how many lumbar vertebra are there?
5
how many vertebra does the sacrum consist of?
5, fused
how many vertebra does the coccyx consist of?
3/4 small segments, fused
what does C1 articulate with?
skull and C2
what do the thoracic vertebra articulate with?
ribs
what does the sacrum articulate with to form?
hip bones
pelvis
in which direction does the spine curve?
lower cervical forward
throacic back
lumbar forward
sacrum sharply backward
what does the neural arch of the vertebra enclose?
the spinal cord
what forms the vertebral canal and what is it for?
series of vertebral foramen
spinal cord
where do the spinal nerves emerge from the vertebrae?
intervertebral foramen
what are the projections from the neural arch/
spinous in midline
transverse processes either side
how many articular processes are there from the neural arch and what is their role?
4, 2 above and 2 below. interlock with adjacent vertebrae forming a synovial joint
what are the features of the cervical vertebrae/
small body upper and lower surface of the body is saddle curved large triangular vertebral foramen neural arch mainly laminae short pedicles spinous process short and double point
which way do the articular facets face in the cervical vertebra?
upper: up and inward
lower: down and forward
what is the C1 vertebra called?
atlas
give some features of the atlas.
no vertebral body or spinous process
lateral masses connected by anterior and posterior arch
what is the C2 vertebra called?
axis
give some features of the axis.
dens=odontoid process=extends superiorly from anterior portion
where are the antlanto-axial joints?
medial: anterior arch C1 and dens of axis
2 lateral: inferior articular facets atlas and superior articular facets axis
which cervical vertebra is most prominent?
C7-long spinous process with a single point
which vertebrae are the most mobile and why?
cervical
curved bodies and shallow articular processes
what movements occur in the cervical vertebra/
flexion, extension, lateral flexion, rotation (mainly between atlas and axis)
give some features of the thoracic vertebra.
body gets bigger as go down
transverse processes point sideways
spinous processes point down
articular processes almost verticle
where do thoracic vertebra articulate with ribs?
end of transverse process and where pedicle meets body
what movements occur in the thoracic vertebra.
little movement due to ribs and spinous processes overlap
forward flexion, lateral flexion, rotation
give some features of the lumbar vertebra.
big body
small transverse processes,
spinous processes pount backwards
upper articular processes face inwards, lower outwards
what movements occur in the lumbaar vertebrae?
almost no rotation
flexion, extension, lateral flexion
where is the sacral promontory?
most anterior point
what emerges through the pelvic sacral foramina?
anterior rami S1-4
where to the posterior rami emerge in the sacrum?
dorsal sacral foramina
where does the vertebral canal end
sacral hiatus (upside down V)
describe the composition of the intervertebral discs.
concentric rings
anulous fibrosis: tough fibrocartilage on outside
nucleus pulposus: soft centre
where are the interspinous ligaments?
lower edge of one spinous process to the upper edge of the next down
where are the supraspinous ligaments?
merge with interspinous, runs whole length vertebral column
where is the ligamentum flavum and its function?
on front of laminae, moves from one laminae to the next, thich and fibro elastic tissue
limit rotation
where are the anterior longitudinal ligaments and their function?
covers side and front of vertebral bodies, runs whole length of column, attached to upper and lower edges of each body. thick
limit extension
where are the posterior longitudinal ligaments and their function/
along back of vertebral bodies, widen over each disc
slightly limit flexion
where are the posterior intervertebral joints and their function?
between articular processes, surrounded by capsular ligament. prevent vertebra sliping forward
what are the deep paravertebral muscles?
short and long rotators
multifidus
what are the superficial paravertebral muscles?
lower=erector spinae (spinalis, longissimus thoracis, iliocostalis)
upper=splenius, longissimus, semispinalis
where do the short and long rotators attach?
short: base of spinous process to vertebra above
long: same but to next vertebra above
where is the origin and insertions of multifidus?
each segment arised from a transverse process
inserts on spinous proces 2-4 vertebra above
whole length of spine
where do the erector spinae originate and insert?
origin: lumbar vertebra, sacrum, iliac crest, thoracolumbar fascia
separate out
spinalis: inserts spinous processes thoracic vertebra
longissimus thoracis: inserts lower 9 ribs
iliocostalis lumborum: inserts lower 6 ribs
what are the functions of the erector spinae muscles?
keep body upright, lateral flexion
what is the dural sac?
sleeve of dura around spinal cord
open at top and passes through foramen magnum and continuous with dura of brain
closed at S2
where is the subarachnoid space?
between pia and arachnoid, filled with fluid
where is the epidural space?
between dura and wall of vertebral canal
filled with fat, connective tissue and blood vessels
where does the spinal cord end?
L1
how is the spinal cord attached to the dura?
denticulate ligaments (triangular)
where do the spinal nerves arise from/
dorsal filaments that unit to form dorsal sensory roots
what do the ventral filaments form?
ventral motor root
in which direction do the nerve roots run?
cervical region: down and oblique
thoracic: more oblique
lubar and sacral: form cauda equina (run vertical)
which primary ramus is larger-anterior or posterior?
ant
which are the largest anterior rami?
C5-T1 (brachial plexus)
L1-S3 (lumbar and sacral plexus)
how are the nerves numbered?
in cervical region the nerve takes number from vertebra below
from T1 down the nerve takes number from vertebrae above
C8 has no corresponding vertebra
what are the parts of the sternum and which allow movement?
manumbrium, body, xiphoid process
some movement between manubrium and body (sternal angle)
which costal cartilage does the manumbrium articulate with?
1st
which costal cartilage does the sternal angle articulate with?
2nd
which costal cartilages form the costal arch/
7th-10th
how many pairs of ribs are there?
12
what type of joint iare the costovertebral?
synovial
which are the strongest ligaments at the costo vertebral joints?
radiate, superior costotransverse
which rib is the broadest?
1st
what is the dome of the pleura level with?
1st rib, although rises when pressure is raised
what are the 2 layers of pleura and where are they continuous?
parietal pleura: lines pleural csvity
visceral pleura: covers lung
hilum of lung
what is the diaphragm?
thin continuous sheet of muscle
where does the diaphragm originate and insert?
inside lower thoracic aperture
sternum, costal arch, 12th rib
where does the oesophagus pass through the diaphragm>
oesophageal hiatus
where does the IVC pass through the diaphragm>
vena caval opening
where does the descending aorta pass through the diaphragm?
aortic opening