Lect 5 Axial Skeleton Myology

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What is another term for costal facets?

demifacets

Thoracic spine osteology

• 2 pair costal/demifacets

How many vertebrae make up the thoracic spine?

12

What is the name for the curve that is rounded in the saggital plane toward the posterior?

kyphotic

Where are the typical thoracic vertebrae?

T2-T8

1, 10-12 are transitional

What do the vertebral foramen look like in T2-8?

small and circular

What spine section has vertebral bodies thhat are approximately equal in the anterior-posterior and transvere?

thoracic vertebrae

What feature is unique to thoracic vertebrae?

2 pairs (inferior and superior) of costal (demi) facets

that articulate with ribs

Which demifacet articulates with the numerically responding rib?

superior demifacet (costal facet)

rib 5 articulate with superior facet of T-5

Rib 6 articulates with the inferior facet of what vertebrae?

T5

Where is the superior demifacet located?

root of the pedicle

Where is the inferior demifacet located?

just anterior to vertebral notch

articulates with rib below

slide 7-11

x

Typical thoracic vertebra include vertebra:

A. T1

B. T5

C. T9

D. T11

T5

Facet Joints

• Oriented primarily in the frontal plane

• Favors flexion and extension

• Upper thoracic limited because of the rigidity of the rib cage