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THE SHOULDER

APPENDICULAR SKELETON

--made of 2 girdles, the arms, and legs

 

 

axial

1) Pectoral Girdle

--reduced because we walk erect

--scapula: attached to rib cage only by muscles

--has an axillary border (facing axilla, or armpit), a vertebral border (facing vertebrae); a superior angle & an inferior angle

--acromion articulates with the clavicle (hence the acromioclavicular joint); the coracoid process & glenoid cavity will form a ball & socket joint with the head of the humerus

--(the pectoralis minor inserts onto the coracoid process)

--on the posterior side, the spine separates the supraspinous fossa (where supraspinatus is located) and infraspinous fossa (where infraspinatus is located); subscapular fossa on the anterior side (where the subscapularis is located)

--on the superior portion of the shoulder, you can feel where the acromion & clavicle articulate; the spine is readily palpable; one can also feel the coracoid by pressing laterally on the anterior shoulder, inferior to the V of the acromioclavicular joint

scapula
scapula
scapula scapula
scapula scapula
left and right
scapula scapula

--clavicle: collarbone; attaches to sternum, good for hanging; since the clavicle transmits the forces of the arm to the trunk, it can be fractured through excess force

--round sternal end (you can feel this knob lateral to the V of your neck) and broad, flat acromial end

clavicle clavicle
clavicle
clavicle