Pectoral and Pelvic Girdles Flashcards
What is the function of the Pectoral Girdle?
Increase the range of movement of the upper limb by changing the position of the glenoid cavity relative to the chest wall.
Name the 2 joints where the pectoral girdle joins the axial skeleton
sternoclavicular and scapulothoracic.
What are the articulating surfaces of the Sternoclavicular joint?
Manubrium of sternum, 1st costal cartilage, medial end of clavicle.
Function of fibrocartilaginous articular disc in the sternoclavicular joint
improve joint congruency, prevent medial displacement of clavicle, shock absorber.
Name the main ligament that stabilises the sternoclavicular joint.
costoclavicular ligament. Between clavicle and 1st rib.
Name the 3 structures that stabilise the acromioclavicular joint.
acromioclavicular ligament, deltoid muscle, trapezius muscle.
Name the main ligament that stabilises the acromioclavicular joint.
coracoclavicular ligament.
What structures are involved in the scapulothoracic joint?
costal surface of scapula –> subscapularis muscle –> serratus anterior muscle –> thoracic wall.
What is the function of the Pelvic Girdle?
Permit weight-bearing, locomotion and maintenance of posture. It requires more strength than pectoral girdle.
What bones make up the pelvic girdle?
left and right hip bones, sacrum and coccyx.
What type of joint is only found on the midline?
Secondary cartilaginous (e.g. pubic symphysis)
Classify the sacroiliac joints.
Atypical synovial. Very limited range of movement, but move passively to relieve stress.
What structures stabilise the joints of the pelvic girdle?
Interosseous ligaments (posterior), sacroiliac ligaments (anterior and posterior), sacrotuberous and sacrospinous ligaments.
What is the function of the sacrospinous/sacrotuberous ligaments?
prevent backward tilting of the lower end of the sacrum by anchoring it to the hip bones.
What structure is present in the sacroiliac joint capsule?
Fibrocartilage disc.
