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Axial Skeleton


The axial skeleton has how many bones? 80
The axial skeleton consists of the.... Skull, vertebral Column, Hyoid, & Bony Thorax
Lies inferior to the mandible, acts as a movable base for the tongue, the only bone with no direct articulation with any other bone Hyoid Bone
The hyoid bone is made up of the.... 2 Greater Horns, 2 Lesser Horns, & the Body
The vertebral column is made up of how many bones? 26 bones in an adult
Surrounds and protects the spinal cord, transmits weight of the trunk to the lower extremeties, also the attachment sites for muscles of the neck & back Vertebral Column
5 Regions of the Vertebral Column Cervical, Thoracic, Lumbar, Sacrum, & Coccyx
C1-C7; 7 vertebrae of the neck region Cervical Region
T1-T12; 12 vertebrae of the ________ Thoracic Region
L1-L5; 5 vertebrae of the lower back Lumbar Region
Inferior to the lumbar vertebrae and superior to the coccyx Sacrum
Most inferior region of the vertebral column Coccyx
Cushion-like pads between the vertebrae fibrocartilage, act as shock absorbers and compose about 25% of the height of the vertebral column Intervertebral Discs
How many curvatures does the vertebral column have? 4
The concave curvatures of the vertebral column from the posterolateral view Cervical & Lumbar Curvatures
The convex curvatures of the vertebral column from the posterolateral view Thoracic & Sacral Curvatures
The smallest and lightest vertebrae C1-C7; the Cervical Vertebrae
Other name of the C1? Atlas
Other name of the C2? Axis
Vertebra that supports the skull and allows for flexion & extension of the neck C1 (Atlas)
Vertebra that allows for rotating of the head from side to side, Dens projects superiorly C2 (Axis)
Projects superiorly and acts as a pivot for rotation of the atlas and skull Dens (Odontoid Process)
These vertebrae all articulate with the 12 pairs of ribs T1-T12; Thoracic Vertebrae
Bodies are thick and robust L1-L5; Lumbar Vertebrae
Shapes the posterior wall of the pelvis, superior surface articulates with L5, inferior surface articulates with the coccyx Sacrum
the Tailbone, most inferior part of the vertebral column Coccyx
Forms the framework of the chest, protects the thoracic organs, supports shoulder girdle and upper limbs Bony Thorax
Components of the Bony Thorax Thoracic Vertebrae Ribs Sternum and Costal Cartilage
Breastbone, made up of three sections Sternum
Superior section that articulates with the medial ends of the clavicles Manubrium
Bulk of the sternum, sides are notched at articulations for the costal cartilage of ribs 2-7 Body (of sternum)
Inferior end of the sternum that ossifies around age 40 Xiphoid Process
Attach to the sternum anteriorly and the vertebral column posteriorly, 12 pairs Ribs
Superior 7 pairs of ribs that attach to the sternum directly with costal cartilage True Ribs
Inferior 5 pairs of ribs that attach to the sternum indirectly False Ribs
Part of the false ribs that do not attach to the sternum at all, inferior two pairs of ribs Floating Ribs
Created by: sbarton