Back vivas demonstrate the bony features of the Atlas and Axis



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BACK VIVAS

Demonstrate the bony features of the Atlas and Axis.

  • Ant and post arch of C1

  • Odontoid process, aka peg or dens

  • Body, lamina, spinous process C2


Describe the movements of the head on the neck.

Rotation occurs at level C1 on C2:



  • Via the synovial atlantoaxial joints, 2 lateral 1 median

  • Lateral atlantoaxial joints: gliding of inferior facets of lateral masses of C1 and superior facets of C2

  • Median atlantoaxial joint: pivoting of anterior arch of C1 and dens of C2

Flexion and extension (nodding) as well as some lateral flexion and rotation occur at the atlanto-occipital joints – superior facets of lateral masses of C1 with the occipital condyles
What are the components of the soft tissue shadow located anterior to the upper cervical vertebrae 2007-2

  1. Anterior longitudinal ligament

  2. Longus colli muscle

  3. Prevertebral fascia

  4. Retropharyngeal space

  5. Alar fascia

  6. Buccopharyngeal fascia

  7. Pharyngeal muscle


2011-2, 2007-2

XR: Lateral Cx-spine

2010-1, 2005-1



Cervical Spine XR

Identify the major bony features of the cervical spine on this xray

  • Atlas: Anterior and posterior arches

  • Axis: Dens, spinous process

  • C3-7: Body, pedicle, lamina, superior and inferior articular process, spinous process

  • Zygapophysial (facet) joint

  • Intervertebral disc space


Describe the ligaments which maintain alignment of the cervical spine 2010-1&2

  • Anterior Longitudinal ligament -> Anterior atlantoaxial and atlanto-occipital membrane

  • Posterior longitudinal ligament -> Tectorial membrane

  • Ligamentum flavum (between lamina) -> Posterior atlantoaxial and atlanto-occipital membrane

  • Interspinous ligaments

  • Supraspinous (tips of spinous processes) to C7, then -> nuchal ligament

  • Intertransverse ligament



Transverse ligament of the atlas

  • Cruciate ligament

  • Alar ligament


Extra: The 5 lines of stability

  1. Prevertebral (anterior) soft tissue

  2. Anterior vertebral bodies

  3. Posterior vertebral bodies

  4. Spino-lamina line

  5. Tips of spinous processes

One line of disruption indicates a stable fracture

Two or more lines of disruption indicate an unstable fracture2010-2, 2006-1

PEG XR aka Oral atlanto axial view



Demonstrate the bony features of the upper cervical vertebrae on this x-ray?

Lateral mass of Atlas (C1), Body of Axis (C2), Dens of Axis (C2), Lateral atlanto-axial joints, Spinous process of Axis (C2), Mandible w/ rami, Occiput w/ occiptal condyles, atlanto-occiptal joint


2011-2, 2007-2, C2 only: 2009-2, 2003-2

Bone: C1-C2

Name these bones. Demonstrate their features and describe the structures stabilising the atlantoaxial joint.




  • Stabilising structures:

    • Anterior arch of Atlas

    • Transverse ligament, part of the…

    • Cruciate ligament, including superior and inferior longitudinal bands

    • Anterior longitudinal ligament -> Anterior atlantoaxial membrane -> Anterior atlantoccipital membrane

    • Posterior longitudinal ligament -> Tectorial membrane

    • Alar ligaments (check rotation)

    • Capsule of lateral atlanto-axial joints




Bone: C2

What are the major ligaments attaching to this bone and where do they attach? 2009-2

  • Tectorial membrane (PLL): post. part of body in canal via foramen magnum to cranial cavity

  • Anterior atlanto-axial membrane (ALL): Anterior body to anterior arch of atlas

  • Posterior atlanto-axial membrane (LF): Laminae to posterior arch of atlas

  • Alar: Sides of dens to lateral margins of the foramen magnum

  • Cruciate - inferior longitudinal part: from post. body of C2 -> transverse ligament between tubercles of lateral masses of C1, and superior longitunal part to anterior rim of foramen magnum






2004-2

Bone: mid cervical

Identify the major parts of this bone

  1. Body (smaller than triangular vertebral foramen)

  2. Transverse Process with foramen transversarum (vertebral artery and veins except C7 veins only)

  3. Lamina (w/ pedicles form the vertebral arch) – note pars interarticularis

  4. Spinous Process – often bifid

  5. Superior and Inferior Articular Processes


Describe the joint between adjacent cervical vertebrae

  1. Intervertebral Joint

    • Symphyses (i.e. secondary cartilaginous joints)

    • Anulus fibrosus (inserted into epiphysial rims) and nucleus pulposus

  2. Zygapophyseal aka facet joints

    • Plane synovial joints

    • Between adjacent superior and inferior articular surfaces

    • Surrounded by joint capsule that is loose in the cervical region


What movements occur at the facet joints?

POINTS REQUIRED

  1. Upper facets face obliquely up and back

  2. Lower facets face down and forwards

  3. Flexion/Extension, lateral flexion (abduction)

  4. No rotation

2011-2, 2011-1, 2009-1, 2007-1, 2003-2



Bone: Thoracic Vertebra


  • Identify this bone, and demonstrate its bony features.

    • Body

    • Pedicle

    • Transverse processes

    • Articular facets: Superior and inferior

    • Costal facets: Superior/Inferior costal facets (head of rib), Transverse costal facet (tubercle of rib)

    • Spinous process

    • Lamina

    • Vertebral foramen

    • Intervertebral notch (space for intervertebral foramina)






What movements are possible at thoracic vertebrae?

  • Rotation: the facets joint planes are aligned vertically on arc centred on vertebral bodies

  • Some lateral flexion, very limited flexion + extension – stability is conferred though connections to sternum


Demonstrate the ligaments.

  • Anterior longitudinal

  • Posterior longitudinal

  • Interspinous

  • Supraspinous

  • Ligamentum flavum


How does this differ from vertebrae in other regions 2009-1

Cervical: smaller body, larger canal, very small and often bifid spinous process, canal for vertebral artery, facet joints flatter, no ribs.


Lumbar: larger body, smaller canal, spinous process square and more directly posterior, no articulations for ribs, more prominent transverse processes.
Intertransverse

What changes occur from upper to lower thoracic vertebrae. 2003-2

  • Body: heart to kidney shape

  • Spinous process: from long vertical to short horizontal

  • Facets on transverse process: concave to flat, A-P to lat-med directed

  • Costal facets on body: from demi to single on 10,11,12

  • Spinal canal: from round to triangular

2011-1, 2009-1, 2007-1, 2005-2, 2003-2, LP only: 2009-2, 2006-1, 2003-1

Bone: Lumbar Vertebra


  • Identify this bone, and demonstrate its bony features.

    • Body

    • Pedicle (to upper half)

    • Transverse processes

    • Superior and inferior articular facets

    • Spinous process

    • Lamina Vertebral foramen

    • Intervertebral foramina

    • Also: Groove for medial branch of post ramus spinal nerve with mamillary process above, and accessory tubercle below



What movements occur in the lumbar spine?

  • Flexion + extension (sagitally orientated facet joint planes)

  • Lateral flexion

  • Very limited rotation


What structures are traversed when you perform a lumbar puncture?


  1. Sterilized skin

  2. Subcutaneous fat

  3. Supraspinous ligament

  4. Interspinous ligament

  5. Ligamentum flavum (“pop”)

  6. Epidural space w/ Extradural fat and venous plexus

  7. Dura mater

  8. Arachnoid mater

  9. CSF in subarachnoid space


What level would you LP an adult and why?

  • Supracristal plane (highest point of iliac crest) ~L4

  • Between L3/4 or L4/5

  • The cord ends behind L2 in adults (conus medullaris), but L4/5 at birth

  • In vertebral cistern = filum terminale, less likely to be damaged than cord b/c mobile in this space



What factors are responsible for stability between adjacent lumbar vertebrae? 2007-1, 2003-2

  1. Bony: Large body with intevertbral joint/discs (not really bony), orientation of facets

  2. Ligamentous: Anterior longitudinal, posterior longitudinal supraspinous, interspinous, intertransverse, ligamentum flavum

  3. Muscular: thick mass of muscle both anterior and posterior (erector spinae)

2005-2


Which area is this vertebra from and why?

  • Lumbar vertebra

  • No costal facets

  • No foramen transversarium

  • Triangular vertebral foramen

  • Articular facets lie in AP plane

  • Kidney shaped body

  • Large Mamillary bodies

Extra: The Scotty Dog on posterolateral oblique view – note the pars interacrticularis = neck




2010-2

BONE: Sacrum

Identify the features of this bone?



  • Sacrum consists of 5 fused bones and the coccyx

  • 4 pairs of sacral foramina – S1-S4 anterior larger than posterior

  • Ala

  • Sacroiliac joint

  • Superior Articular facets

  • Lumbrosacral joint

  • 5 Vertical lines – median, intermediate and lateral


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