Dermatomes + Vertebral Column Back 1 Flashcards
C3-C8 Dermatomes
Neck region
Down arm
T1-T11 Dermatomes
Medial side of arm
Thorax
C7 down to small of back
L1-L5 Dermatomes
Lower back
Anterior and medial leg
S1-S2 Dermatomes
Posterior and lateral leg
Vertebral Column made of
7 cervical vertebrae 12 thoracic vertebrae 5 lumbar vertebrae (L1-L5) 5 fused sacral vertebrae 3-4 fused vertebrae of the coccyx
Body of Vertabrae
Support of body weight
Vertebral Arch
Protection of spinal cord
2 pedicles and laminae
Articular Processes
Restriction of movement
Stability
Transverse Processes
Muscle attachment
Movement
Spinous Processes
Muscle attachment
Movement
Foramen Transversium (C1-C6)
Vertebral artery passage
Atlas (C1)
No body or spinous process
Superior articular facets for occipital condyles
Thoracic Vertebrae
Stable
Articulate with ribs
Lumbar Vertebrae
Articular proceses limit rotation but allow flexion/extension
Sacral Hiatus
Posterior, inferior opening to sacral canal
Access to epidural space
Annulus Fibrosus
Concentric layers of oblique fibers around and between vertebral bodies
Nucleus Pulposus
Avascular, gelatinous mass
Shock absorber and semifluid ball bearing
Anterior Longitudinal Ligament
Runs anterior to vertebral bodies
Limits hyperextension
Posterior Longitudinal Ligament
Runs posterior to vertebral bodies
Weaker than anterior
Provides stabilization
Ligamentum Flavum
Extends from lamina to lamina
Forms posterior boundary of intervertebral foramen/posterior wall of spinal canal
Where does C1 exit?
Above Atlas
Where does C2 exit?
Below Atlas
Where does C8 exit?
Below C7
Where do thoracic, lumbar and sacral nerves exit?
Below corresponding vertebrae
