5 (C) vertebrae Flashcards
AT what level does the spinal cord end?
L1-L2
What is the name of the end of the spinal cord?
Conus Medullaris
Vertebrae - vertebrae are held together by what joints?
Facet Joints
The pedicles of the vertebrae attach what?
Transverse process to body of vertebrae
The laminae of the vertebrae attach what
transverse process to spinous process
C1 articulates with what part of the skull
occiput
What does the joint of C1 - Occiput allow?
Allows us to nod
What type of joint is present between C1 - C2
Pivot Joint
What is present on C7 which makes it a landmark (name)
Long spinous process —> Vertebrae Prominens
What does the atlas NOT have (2)
vertebral body + Spinous process
Does C2 have a vertebral body?
No
What part of C2 allows the pivot joint of c1 + c2 to occur?
Dens
What type of joint is the Pivot join in C1 - C2
Synovial –> RA
Vertebral artery + vein pass through what parts of the vertebrae?
At what level does it not pass through this foramina
Transverse Foramina
C7
Name of the Fracture of the Atlas caused by high axial loading?
Jeffersons Fracture
Fracture of the dens is typically caused by what/
Hyperextension // Hyperflexion
The superior demifacet found on thoracic vertebrae is equal to what in terms of rib
Corresponding rib
What thoracic vertebrae are common fracture places
T11 / T12
What does the spinous process look like on a lumbar vertebrae?
Short // Stumpy
Anterior Sacral Foramina is important for what?
Exit of spinal nerves
The Wings of the pelvis are called what?
Ala
Which vertebrae are the most flexible?
C + L
What movement is only possible at thoracic vertebrae?
Rotation
What is the chief extensor of the intrinsic muscle of the bacl?
Erector Spinae
What are the 3 muscles of the erector spinae
Longissimus Muscle
Iliocostalis Muscle
Spinalis Musclle
What is the deepest muscle layer of the back?
Dus
Thicker vertebrae = ?
More flexibility
What are the two key structures in the vertebrae disk?
What is the inner one?
Annulus fibrosus
Nucleolus Pulposus (inner)
What happens to disk over time?
dehydrate = Stiffer
What are the 2 most common slipped disks / herniation areas
L4 / L5
L5 / S1
What syndrome can arise from slipped disk
Cauda Equina
Posterior Longitudinal Ligament resists what (2)?
Hyperflexion
Posterior Herniation
Posterior longitudinal Ligament can be found from what - what?
C2 - Sacrum
Anterior longitudinal Ligament resists what which is the only ligament to do so?
Resists Hyperextension
Anterior Longitudinal Ligament can be found from what to whaat
Occipital / C1 –> Sacrum
Ligamentum Flavum binds what
Adjacent Vertebrae
Ligamentum Nuchae can be found where?
Occipital –> C7
What are the ligaments that a lumbar puncture goes through? (3)
Supraspinous ligament
interspinous ligament
Ligamentum Flavum (pop)
How many pairs of spinal nerves are there
31 pairs
Cauda Equina?
nerve rootlets
What is the epineurium found on nerve cells
Meningeal layer that is taking when spinal nerve leaves vertebral canal
Dural sac grows with …… but ….. doesnt
Vertebral column
Spinal cord doesnt
How many posterior spinal arteries are there?
Anterior?
2
1
What gives rise to the posterior spinal artery
Segmental spinal artery –> Vertebral // Deep cervical etc.
What key structure is NOT found below T6 in the spinal cord
Cuneate Tubercle
The Dorsal Column is responsible for what (sensations)
FINE touch / pressure / proprioception
The Spinothalamic tract is responsible for what (sensations)
CRUDE touch / pain / temperature
As a rule of thumb, fibres that are essential to survive (pain / temp / some touch / pressure) have what type of structure / speed
Slow demyelinated fibres
As a rule of thumb, fibres that increase detail (fine touch , proprioception) have what type of structure / speed
Large diameter myelinated fibres fast
1st Order Neurons are what type of neurone?
Pseudounipolar neurone
Spinothalamic pathway is somatopically organised - how is it done?
D
Leg
Trunk
Arm
V
Lissauer’s tract is found where
Dorsal Grey Horn
Does spinothalamic cross over midline? What crosses over?
Yes
Axon of 2* Neurone cross over
What does the 2* Neurone Axon become after the Medulla?
Spinal Lemniscus
The Spinothalamic pathway goes to what part of the thalamus?
VPL
FATL for somatotopic map runs from what - what?
Laterally to Medial
Do the Dorsal Column Medial Lemniscus Pathway cross over at midline when passing into the cord?
What does it go through Above T6
No
Goes up Cuneate Tubercle
In the DCML pathway, what structure does the pathway go up below T6
Gracile Tubercle
What part of the medulla does the DCML go through?
What are the name of the fibres that cross midline?
Closed Medulla
Internal Arcuate Fibres
What does the 2* neurone axon from DCML go through that is somatotopically organised?
Medial Lemniscus
What is the structure of the somatotopically organised medial lemniscus?
D
Arm Trunk Leg
V
What part of the internal capsule does the ascending fibres pass through?
Posterior part of internal capsule
What are the 3 nuclei involved in the trigeminal sensory pathway in order from Midbrain –> Medulla
Mescencephalic nuclei
Pontine nucleus (chief)
Spinal Nucleus
What sense does NOT GO THROUGH trigeminal ganglion?
what does it go through instead?
Proprioception
Mescencephalic nuclei
What nuclei does the proprioception pathway go through after the mescencephalic nuclei?
What reflex is this involved with
Motor
Jaw Jerk Reflex
What part of the thalamus does the trigeminal pathway go to
VPM
Pain / Temp nuclei are found most what? (think diagrm)
Inferiorly
Discriminatory touch uses what nuclei (think diagram)
Pontine Nuclei (Chief)
What are the fibres called that cross in the DCML called when entering the medial lemniscus
internal arcuate fibres
How do crude touch fibres from the spnothalamic cross
go up a few levels then cross over
The ligamentum flavum is found:
between adjacent laminae
In which regions of the vertebral column are kyphoses found?
thoracic + sacral
heart-shaped body and round vertebral foramen
thoracic vertebrae
what kind of spinous process do thoracic vertebrae have?
long and orientated postero-inferiorly
which vertebrae have a horizontally-orientated spinous processes?
cervical + lumbar
the posterior part of the affected vertebral body loses height in a wedge fracture?
No
vertebrae with have an oval-shaped body
lumbar
which vertebrae are more prone to dislocation than other vertebrae
cervical
which vertebrae are the most flexible?
cervical
What is a common site for the origin of an embolism in an ischaemic infarct?
Carotid arteries
damage to the anterior segmental medullary artery will lead to what being affected
Spinothalamic –> pain and temperature sensation
cervical have what type of body?
They also have what type of process?
Bifid process
Round Body