Osteology (Relevant Features) - Upper Extremity Flashcards

1
Q

Clavicle

A

Crank shaped/S-shaped long bone; convex medially and concave laterally

transmits forces from upper limb to axial skeleton (only bony articulation between UE and upper extremity - SC joint)

Fractures usually occur just before the lateral third where the joint goes from being convex to concave

SC joint - rarely dislocates
AC joint - frequently dislocates

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2
Q

Scapula

A

Sits over ribs 2-7

About 5 cm lateral to spinous processes of vertebrae

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3
Q

Humerus

A

Fracture tends to happen at the surgical neck

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4
Q

Sternum

A

Elongated flat longbone in the anteromedial portion of the thoracic wall

Articulations:
Sternoclavicular joint (clavicle and manubrium)
Sternocostal joints (body and costal cartilages of ribs 1-7)
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5
Q

Ribs

A

True Ribs - 1-7 (articulate with sternum at sternoclavicular joints via costal cartilages)

False Ribs - 8-10 (costal cartilages join up with the costal cartilages of the rib above

Floating Ribs - 11-12 - cartilages are rudimentary and end in the abdominal musculature

Articulations:
Costochondral joint
Sternocostal joints
Costovertebral joints

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