Exam 3 Flashcards
Ligaments of cervical spine (7)
Posterior atlantoaxial Anterior atlantoaxial Tectorial membrane Ligamentum nuchae Transverse atlantal Alar Apical
Posterior atlantoaxial continuation of
Ligamentum flavum
Anterior atlantoaxial continuation of
ALL
Tectorial membrane continuation of
PLL
Ligamentum nuchae continuation of
Supraspinous
Functions of transverse atlantal ligament
Holds dens against atlas and prevents anterior displacement of atlas on axis
Function of alar ligament
Prevent distraction of occiput on atlas and limit SB
Becomes tight in rotation
Attachments of transverse ligament
One side of atlas to the other
To occiput superiorly and to axis inferiorly
Attachments of alar ligaments
From side of dens to medial occipital condyles
Attachments of apical ligaments
Apex of dens to anterior margin of foramen magnum in occiput
Function of apical ligament
Aligns dens and keeps it straight up
Direction of cervical pedicles
Posterolateral
Direction of cervical lamaniae
Posteromedial
Cervical vertebral foramen
Triangular and largest because it houses all branches of spinal cord
Characteristics of cervical vertebral body
M/L larger than A/P
Uncinate process on superior body to give concave shape and stability
Direction of superior facet of cervical vertebrae
Superior and posterior
Direction of inferior facet of cervical vertebrae
Inferior and anterior
Angle of superior articular facet of cervical vertebrae
45 degrees between horizontal and vertical axis
Function of cervical spine
Stability of head on occiput and rest of cervical spine
House the spinal cord
Mobility of A/O joint
Primarily nodding
Roll and glide in opposite direction
SB and rotation in CL direction (limited)
Mobility of A/A joint
Primarily rotation
55% of rotation of c spine
Mobility of C2-C7
Lateral flexion, rotation, flexion
Limitations to mobility of C2-C7
Ligaments, annulus fibrosus, and facet orientation
Roll and glide of cervical spine (C2-C7) flexion and extension
Flexion - anterior rotation and ant/sup glide to open up joint
Extension - posterior rotation and post/inf glide to close joint
Most flex/ext of cervical spine occurs at what level
C5/C6
Protraction of cervical spine
Lower to mid c spine flexes as upper craniocervical spine extends
Retraction of cervical spine
Lower to mid c spine extends as upper craniocervical spine flexes
Characteristics of the body of the lumbar vertebrae
Transverse greater than AP and height
Supraspinous ligament ends at
L3 or L 4
Intertransverse ligament replaced by
Iliolumbar ligament
Characteristics of iliolumbar ligament
Transverse process to iliac crest
Primary function is to prevent anterior shear and resist movement of L5 on Si
Loaded more in flexion
Mobility of lumbar area limited by
Orientation of facets
Greatest amount of flexion in lumbar area
L5
Greatest amount of SB and rotation in lumbar area
L2-L3
Orientation of (anterior) facet of lumbar vertebrae
Frontal plane
Orientation of (posterior) facet of lumbar vertebrae
Sagittal plane - allows a lot of flex/ext
Coupled movements of lateral flexion/rotation in lumbar area
Lateral flex with CL rotation
Pattern of lumbar-pelvic rhythm as you FB
Lumbosacral flexion (flattening of lumbar spine) and then anterior tilt of pelvis
Pattern of lumbar-pelvic rhythm as you go from flex to ext
Posterior tilt then extension of spine (can assess hip extensor activity)
Function of lumbar vertebrae
Stability from body weight, ground rxn forces, and muscles
Support body weight
Amount of force going through bodies/facets for compression in lumbar area
80% through disc
20% through facet
Shear in lumbar vertebrae resisted by
Facets and the amount of frontal plane movement
Function of SI joint
WB joint that tries to distribute weight equally to LE
Transmits ground rxn forces up equally through vertebral body
Provides absorption to relieve stress on ring
Most important ligament for SI stability
Interosseous SI ligament
Sacrospinous ligament
Sacrum to ischial spine
Provides good inferior stability
Ligaments of pubic symphysis
Superior and inferior Pelvic
Posterior pelvic
Structures that resist nutation of sacrum
Sacrotuberous, sacrospinous, anterior SI, and interosseous ligament
Structures that resist counternutation
Long post SI ligament and iliolumbar ligaments
Characteristics of body of thoracic vertebra
Larger than cervical, smaller than thoracic
A/P and M/L about equal
Wedge shaped (Higher posteriorly)
How many demifacets on thoracic vertebrae
4
Orientation of pedicles of thoracic vertebrae
Almost purely posterior (not lateral because foramen not large)
Orientation of articular processes and what motion does this allow?
Frontal Plane (mostly SB and rot)
Upper thoracic spine movements
Moves like cervical spine
IL SB and rotation
Lower thoracic spine movements
Moves like lumbar spoine
CL SB and rotation
Limits to flexion in thoracic spine
PLL, ligamentum flavum, interspinous, capsule, and post disc
Limits to extension in thoracic spine
SP, anterior disc, facets, ALL, abdominal muscles
Limits to lateral flexion in thoracic spine
Rib cage and facets
Limits to rotation in thoracic spine
Rib cage
LOG of spine
Anterior to thoracic spine
Creates a flexion moment that is resisted by muscles and posterior structures
Greatest at peak of kyphosis (T7)
Function of thorax
Attachment of muscles
Protection of viscera
Ventilation
How many articulations are there for ribs on a thoracic vertebrae? Where are they?
4 on vertebral body
2 on transverse process
Vertebrae that have articulations with just one rib
T1, T11, T12
Radiate ligament attachments
Superior - to body above
Inferior - to body below
Intermediate - to IV disc
Intra-articular ligament
From ridge of rib to IV disc
Intra-articular ligament
From ridge of rib to IV disc
Costovertebral joint is what kind of jont
Plane
Costotransverse joint is what kind of joint
Syovial
Superior transverse ligament
Crest of rib below to tp of vertebrae above
Prevents too much elevation
Costochondral joint at which ribs
1-10
Pump handle movement m
Occurs in upper ribs
Increases AP diameter
Bucket handle movement
Occurs in lower ribs
Ribs move laterally
Bucket handle movement
Occurs in lower ribs
Ribs move laterally
Curvature angle of cervical spine
30-35
Curvature angle of thoracic spine
40
Curvature angle of lumbar spine
45
Pedicles transmit…
bending forces from spinous process to body
Vertical trabecular systems resist
Compressive forces
Oblique trabecular system resists
Oblique forces
Function of intervertebral disk
Separate vertebral bodies to allow movement to occur
Transmits forces
Dissipates forces
What kind of cartilage is in a young disc
Hyaline cartilage
What kind of cartilage is in an older disc
Fibrocartilage
What part of disc is innervated
Outer 1/3 to 1/2 of annulus
What part of disc is innervated
Outer 1/3 to 1/2 of annulus
Circulation of disc
Most by diffusion, small amount of circulation to end plate and annulus
Where do most disc hernations occur
L4/L5 and L5/S1
Characteristics of zygapophyseal joints
Synovial
Meniscoid structures that are part of capsule
Capsule resists flexion
Joints resist shear in lumbar area because of facets in frontal plane
Facet joint orientation of cervical spine and associated movements
Triplanar
All motions
Facet joint orientation of thoracic spine and associated movements
Frontal
Rotation and lateral flexion
Facet joint orientation of lumbar spine and associated movements
Sagittal plane
Flexion/extension
Facet joint orientation of lumbar spine and associated movements
Sagittal plane
Flexion/extension
ALL is well developed in…
Lordotic areas (cervical and lumbar)
Special characteristics of ligamentum flavum
Made of elastic fibers (yellow in nature)
Under constant tension(increases compression of disc and intradiscal pressure and prevents compression of spinal cord)
Ligamentum flavum strongest in? Weakest in?
Lower thoracic
Mid cervical
First ligaments injured with hyperflexion
Interspinous and supraspinous
Characteristics of supraspinous ligament
On top of SP Merge in lumbar area with Thorac. fascia Stops at L3 or L4 Becomes ligamentum nuchae at C7 Has mechanoreceptors to stabilize spine
Ligamentum nuchae
Takes place of supraspinal and interspinal ligaments
Amount of mobility determined by…
Ratio of disc to body
Direction of movement determined by…
Orientation of facets
Extension of spine limited by
ALL Spinous process Ant. trunk muscles Ant. annulus Joint capsule
Lateral flexion limited by
CL side of annulus, CL intertransverse ligament, and CL trunk muscles
Axial compression resisted by
Disc
Vertebral bodies
Neural arches
Axial rotation limited by
Annulus and facet joints