with a neat labelled diagram explain the scapula of human
Answers
Answer:
Scapula, also called shoulder blade, either of two large bones of the shoulder girdle in vertebrates. In humans they are triangular and lie on the upper back between the levels of the second and eighth ribs.
Answer:
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Explanation:
the scapula , also known as the shoulder bone, shoulder blade, wing bone or blade bone, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on either side of the body being roughly a mirror image of the other. The name derives from the Classical Latin word for trowel or small shovel, which it was thought to resemble.
The scapula forms the back of the shoulder girdle. In humans, it is a flat bone, roughly triangular in shape, placed on a posterolateral aspect of the thoracic cage.
The structure:
The scapula is a wide, flat bone lying on the thoracic wall that provides an attachment for three groups of muscles: intrinsic, extrinsic, and stabilising and rotating muscles. The intrinsic muscles of the scapula include the muscles of the rotator cuff—the subscapularis, teres minor, supraspinatus, and infraspinatus. These muscles attach to the surface of the scapula and are responsible for the internal and external rotation of the shoulder joint, along with humeral abduction.
Movements of the scapula are brought about by the scapular muscles. The scapula can perform six actions:
Elevation: upper trapezius and levator scapulae
Depression: lower trapezius
Retraction (adduction): rhomboids and middle trapezius
Protraction (abduction): serratus anterior
Upward rotation: upper and lower trapezius, serratus anterior
Downward rotation: rhomboids, Levator Scapulae, and Pec Minor
