7.4 pectoral girdle Flashcards
the pectoral girdles attach the __ to the __
upper limbs, axial skeleton
clavicles/collarbones
slender, s-shaped bones that can be felt along their entire course as they extend horizontally across the superior thorax
the clavicles:
hold the scapulae and arms out laterally
sternal end
rounded end of the clavicle that articulates with the manubrium of the sternum
acromial end
flattened end of the clavicle that articulates with the acromion of the scapula
the medial 2/3 of the clavicle is
convex anteriorly
the lateral 1/3 of the clavicle is
concave anteriorly
the superior surface of the clavicle is
smooth
the interior surface of the clavicle is
ridged and grooved by ligaments and by the action of the muscles that attach to it
scapulae/shoulder blades
thin, triangular flat bones
the scapulae lie:
on the dorsal surface of the rib cage, between ribs 2 and 7
superior border of the scapulae
shortest, sharpest border
medial/vertebral border of the scapulae
parallels the vertebral column
lateral/axillary border of the scapulae
thick, next to the armpit, ends superiorly in the glenoid cavity
glenoid cavity
articulates with the humerus, forms the shoulder joint
superior angle of the scapulae
superior scapular border meets the medial border
lateral angle of the scapulae
superior scapula border meets the lateral border
inferior angle of the scapulae
the medial border meets the lateral border
acromioclavicular joint
acromion articulates with the acromial end of the clavicle
coracoid process
projecting anteriorly from the superior scapular border
-helps anchor the bicep muscle of the arm
suprascapular notch
nerve passage that bounds the coracoid process and the glenoid cavity
infraspinous and supraspinous fossae
inferior and superior to the spine
subscapular fossa
shallow concavity formed by the entire anterior scapular surface
