Thoracic Spine Flashcards
What is the coronal facet orientation of the thoracic vertebrae?
60 degrees
Which thoracic vertebrae are atypical and why?
T1 and t12, because they have unifaceted ribs
Which ribs are unifacets and which are demifacets? What does it mean?
Uni- articulates with one vertebra (T1 and T12)
Demi- 2 vertebrae (T2-T11)
Which thoracic spine segments have their spinous processes and transverse processes at the same level?
T1- T3
T12
Which thoracic spine segments have their spinous processes 1/2 level below their transverse processes?
T4-T6
T11
Which thoracic spine segments have their spinous processes 1 full level below their transverse processes?
T7-T10
Anterior Longitudinal ligament
◼ Anterior bodies/discs
◼ Restrains extension
◼ Occiput to sacrum
Posterior Longitudinal ligament
◼ Posterior bodies/discs
◼ Restrains flexion
◼ C2 to sacrum
Supraspinous ligament
◼ Spinous processes
◼ C7 to L3-4
◼ Restrains flexion
Interspinous ligament
◼Spinous processes
◼ C7 to L3-4
◼ Restrains flexion
◼ Anchors T-L fascia
Ligamentum Flavum
◼ C2 to sacrum along posterior canal
◼ 80% Elastin “yellow”
◼ Assists regaining upright position
◼ Attaches to facet anteromedially and prevents impingement
Intertransverse ligaments
◼ Transverse processes
◼ C2 to sacrum
◼ Restrains lateral flexion
Costovertebral ligaments connect in which directions?
◼ Superior
◼ Lateral
◼ Radiate
Why study the muscles of the thoracic spine?
⦿ Diagnostic entity
⦿ Identify primary motion restrictor
⦿ Role in treatment
What are the 3 layers of thoracic spine muscles?
Superficial
Intermediate
Deep
What is the difference between unisegmental and polyysegmental muscles?
Unisegmental- segment to segment
Polysegmental- segment to 2 or greater segments away
What are the deep thoracic muscles? Which are unisegmental/ polysegmentlal?
TRANSVERSOSPINALIS
Uni- rotatores brevis
Poly- Rotatores longus
- Multifidi
Deep thoracic muscles are often responsible for ___________ position of Type ____ spinal dysfunction
Maintaining
Type II
What are the intermediate thoracic muscles?
Erector Spinae ◼ Spinalis ◼ Longissimus ◼ Iliocostalis Other ◼ Serratus Posterior • Superior • Inferior
The erector spinae are often responsible for ___________ position of Type ____ spinal dysfunction
Maintaining
Type I
What are the superficial thoracic muscles?
Trapezius
Latissimus dorsi
Rhomboids
Pectorals
Which superficial thoracic muscle is most likely to weaken rather than tighten?
Rhomboids
Which thoracic superficial muscles are more likely to tighten rather than weaken?
Trapezius
Latissimus dorsi
Pectorals
What are the spinal nerves of the thoracic vertebrae?
12 pairs, T1-T12
Motor and sensory
The sympathetic chain ganglion are __________ in function and run from___-___
Autonomic
T1- L2
What is a motion segment?
2 adjacent vertebrae and an intervertebral disc
How many joints are in a motion segment?
2 facets 1 symphyseal (disc)
What serves as the functional unit for the spine?
Motion segments
What are the 2 main components of the intervertebral discs?
Annulus fibrosis
Nucleus pulposis
What percentage of force does the intervertebral disc attenuate?
60%
Which forces are intervertebral discs resistant to? Which are the worst?
Torsion
Tension
Shear
Compression
Torsion and Tension are the worst
The IV disc works it’s best when Internal pressure (>/=/
=
In the IV discs, how much height is lost during the day?
2 cm
In the IV discs, what percentage of height is lost within the first 30 minutes of waking up?
54%
When is there the highest risk of IV disc injury?
Morning
Which position will allow for the rehydration of the anterior disc?
Hyper extension/ prone
Which position will allow for the rehydration of the posterior disc?
Flexion (Supine)
Blood supplies disc up to
__________ then
reliant on passive
mechanical means
8 years of age
Where is the optimal Zone of Load for an IV disc?
Where the load is most stable and neutral
How many degrees off flexion are available in the thoracic spine?
45-50
How many degrees off extension are available in the thoracic spine?
5-10
How many degrees off lateral flexion are available in the thoracic spine?
40.
How many degrees off rotation are available in the thoracic spine?
20
What percentage of weight do facet joints bear?
40%