How are the pectoral and pelvic girdles adapted/ suited to their function?

a)Pectoral girdle
-It has scapula which has a glenoid cavity/ socket/depression; to articulate with the head of the humerus to form a ball and socket joint to allow movement of the arm in all directions;
-Scapula has broad/flat blade; to increase the surface area for attachment of muscles;
-Scapula has long spine; to increase the surface area for attachment of muscles;
-Scapula is hard/ rigid; to provide support;
-Scapula has ridge or coracoid process; to increase surface area for muscle attachment;
-It has a cartilage (suprascapula) at the edge of the blade; to reduce friction;
-It has acromion; for articulation with the clavicle and muscle attachment and metacromion for attachment of shoulder and back musclesl
-Clavicle has long shaft; to provide large surface area for attachment of chest muscles and also helps in movement of the arm;
-Clavicle has acromial facet; for articulation with acromion (of scapula) and sternal facet for articulation with sternum;
-Clavicle is hard and calcified; providing support and for attachment of muscles;
b)Pelvic girdle.
-It has acetabulum; to articulate with the head of femur to form ball and socket joint allowing movement of the hind limb in all planes/ directions;
-It is made up of three bones which are fused together to form a rigid structure; to provide support;
-It has broad ilium; to provide a large surface area for attachment of thigh muscles;
-The ilium has a broad facets; for articulation with the transverse processes of the sacrum;
-It has obturator foramen; for the passage of blood vessels, nerves and muscles;
-It has pubis symphysis composed of flexible cartilage; which allows widening of the females’ pelvic girdle when giving birth and acts as a shock absorber;