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Hyoid
a U-shaped bone in the neck that supports the tongue.
what is special about the hyoid?
only bone that does not attach to any other bone; held in place by muscle
Cervical Vertebrae (C1-C7)
neck region of the spine
Cervical vertebra features
how many cervical vertebrae?
7
Atlas/C1
supports head, movement up and down
C1 - articular facet for dens
on posterior surface of anterior arch
C1 - transverse process
C1 - transverse foramen
only found in the cervical vertebrae and allow passage of the vertabral artery, vein, and nerve
C1 - vertebral foramen
anterior part holds the dens and the larger posterior part holds the spinal cord.
C2 - dens
Projects superiorly and articulates with C1 and allows head to shake "no"
C2 - transverse process
C2 - transverse foramen
passage for vertebral arteries and accompanying veins
C2 - vertebral foramen
Thoracic Vertebrae (T1-T12)
second set of 12 vertebrae; they articulate with the 12 pairs of ribs to form the outward curve of the spine
how many thoracic vertebrae?
12
Lumbar Vertebrae (L1-L5)
third set of 5 larger vertebrae, which forms the inward curve of the spine
how many lumbar vertebrae?
5
Thoracic vertebra features
Lumbar vertebra features
Distinguish between C, T and L vertebrae
Vertebral body
part of a vertebra that transfers weight along the axis of the vertebral column
Spinous process
sharp, slender projection. Can feel on your back
what is special about cervical vertebrae spinous process?
bifid (split)
Transverse process
two lateral projections from the vertebral arch
Transverse process (cervical)
Vertebral foramen
canal through which spinal cord passes
concave
curving inward
convex
curved outward
Cervical curvature
concave - C1-C7
Thoracic curvature
convex - T1-T12
Lumbar curvature
concave - L1-L5
Sacral curvature
convex - S1-S5
Sacrum (5 fused)
Is formed by union of 5 sacral vertebrae and serves as a strong foundation for the pelvic girdle
how many vertebrae make up the sacrum?
5
Coccyx (4 fused)
tailbone
how many vertebrae make up the coccyx?
4
Ribs
The bones in the chest that protect the heart and lungs.
True ribs (1-7)
directly attach to the sternum via cartilage
False ribs (8-10)
attach indirectly to sternum by joining costal cartilage of rib above
Floating ribs (11 & 12)
last pair of ribs of the bottom ribcage, not connected to cartilage
Costal cartilage
the cartilages that connect the sternum and the ends of the ribs
Sternum
breastbone
Manubrium of sternum
top of sternum
Body of sternum
middle portion of the sternum
Xyphoid process of sternum
bottom of sternum