Kinesiology 10 Flashcards
Shoulder Joint
shoulder joint
a ball-and-socket joint with movement in all three planes and around all three axes.
four groups of motion possible at shoulder joint
1) flexion, extension, and hyperextension 2) abduction and adduction, 3) medial and lateral rotation, 4) horizontal abduction and horizontal adduction.
felexion, extension, and hyper extension
happen around sagittal plane, frontal axis. Flexion is 180 degrees, extension is return to anatomical position, hyperextension is approximately 45 degrees from the anatomical position
Abduction and adduction
occur on the frontal plane around the sagittal axis with 180 degrees od motion possible
medial and lateral rotation
occur on the transverse plane around the vertical axis. from a neutral position is is possible to move 90 degrees in each direction
horizontal abduction and horizontal adduction
occur in the transverse plane around the vertical axis. from arbitrary starting position of 90 degrees of shoulder abducion there would be approximately 30 degrees of horizontal abduction(backward motion and approximately 120 degrees of horizontal adduction (forward motion)
shoulder joint normal end feel
for all shoulder joint motions normal end feel is firm
glenohumeral joint
convex humeral head moves with concave glenoid fossa
convex-concave rule with glenohumeral joint
convex joint surface (humeral head) moves opposite distal end
the greatest amount of arthrokinetic motion
happens when the glenohumeral joint is in the open packed position of 55 degrees abduction and 30 degrees horizontal adduction
glenoid fossa
A shallow, somewhat egg-shaped socket on the superior end, lateral side, articulates with humerus
genoid labrum
fibrocartilaginous ring, attached to the rim of the glenoid fossa, which deepens the articular cavity
subscapular fossa
includes most of the area on the anterior (costal) urface, providing attachment for the subscapularis muscle
infraspinossa fossa
below the spine, providing attachment for the infraspinatus muscle
supraspinous fossa
above the spine , providing attachment for the supraspinatus muscle
axillary border
providing attachment for the teres major and teres minor muscless
acromium process
broad, flat area on the superior lateral aspect, providing attachment for the middle deltiod muscle
humerus
longest bone of upper extremity
head of humerus
semiround proximal end, articulates with scapula
surgical neck
slightly constricted area just below the tubercules where the head meets the body
anatomical neck
circumferential groove separating the head from the tubercule
shaft
or ‘body’, the area between the surgical neck and the wider distal end
greater tubercule
large projection lateral to head and lessr tubercule; provides attachment for thee superspinatus , infraspinatus, and teres minor muscles
lesser tubercule
smaller portion of the anterior surface, medial to the greater tubercule; provides attachment for the subscapularis muscle
deltiod tuberosity
on the lateral side of the midpoint of the shaft, not usually a well defined landmark