Scapula Flashcards
Scapula
large, flat, triangular bone with two basic surfaces: posterior and costal
superior (cranial) boarder
shortest and most irregular border
scapular notch (or foramen)
is a variable feature on the superior border
the semicircular notch is formed partly by the base of the coracoid process
coracoid process
juts anteriorly and superolaterally from the superior border of the scalar
finger-like blunt rugose projection
subscapular fossa
the shallow concavity that dominates the anterior surface of the scapula
oblique ridges
cross the subscapular fossa from superolateral to inferomedial
lateral (axillary) boarder
the anteroposeteiorly thickest boarder
usually concave
glenoid cavity (glenoid fossa)
shallow, vertically elongate concavity that receives the head of the humerus
the shallowness of this joint allows great mobility
supraglenoid tubercle
sits adjacent to the superior edge of the glenoid cavity, the base of the coracoid
infraglenoid tubercle
sits just adjacent to the inferior edge of the glenoid cavity
scapula neck
slightly constricted region just medial to the glenoid fossa
medial (veterbral) boarder
is the straightest, longest, and thinnest border
scapular spine
dominates the posterior surface of the scapula
passes mediolaterally across this surface, merging medially with the vertebral boarder and projecting laterally at the acromion process
acromion (acromion process)
lateral projection of the scapular spine
its cranial surface is very rough
supraspinous fossa
large, mediolaterally elongate hollowing superior to the base of the spine
infaspinous fossa
is the hollowing inferior to the scapular spine
extensive, weak concave area
superior angle
is where the superior and medial (vertebral) boarders intersect
inferior angle
where the vertebral (medial) and axillary (lateral) boarders intersect
Siding: isolated glenoid
the fossa is tear drop-shaped with its blunt end inferior
When correctly orientated, the anterior edge has a broad notch in it
Siding: isolated acromion
the inferior surface is concave and is smoother than the superior
clavicular facet is placed anteriormedially relative to the tip
Siding: isolated vertebral boarder
the anterior surface is concave and the posterior is convex
the oblique ridges run from superolateral to inferomedial (parallel to the scapular spine)
Siding: isolated inferior angle
anterior surface if concave, while the postural is convex
the thickest boarder is lateral (axillary)
Siding: isolated coracoid
the smooth surface is inferior, the rough superior
the anterior boarder is longer
the hollow on the inferior surface faces the glenoid area (posteroinferiorly)
Siding: isolated spine
the spine thins medially (vertebrally) and thickens toward the acromion
the inferior boarder has a tubercle that points inferiorly
adjacent to the spine the infraspinous fossa is most deeply excavated medially
the supraspinous fossa is most deeply excavated laterally
