Musculature of the Shoulder

Musculature of the Shoulder

  • Submitted By: pta2011
  • Date Submitted: 02/03/2009 7:13 PM
  • Category: Psychology
  • Words: 962
  • Page: 4
  • Views: 2

I picked the musculature of the shoulder because it is a very versatile and very necessary joint for normal human activity. The shoulder is a very interesting and the use of bones and positioning of muscles allows for a wide range of movement and makes it powerful. The shoulder comparative to other joints is fairly durable but injuries do occure.
There are two main bones in the shoulder the humerus and the scapula. The
humerus is the long slim bone that extends from your shoulder to your elbow. The
scapula or shoulder blade is the scapula which extends from the top of your
shoulder down the posterior side of the shoulder and forms a triangular shape. At
the top of the humerus there is ball-shaped projection that fits into the socket or
glenoid of the scapula, this is why it is a ball and socket joint. The round end of
the humerus fits into the socket of the scapula and allows a wide range of
movement. The rotator cuff is the complex of four muscles that arises from the scapula where their tendons attach to the humerus. The four muscles are the supraspinatus, infraspinatus, the subscapularis, and the teres minor in other words (S.I.T.S.). The connection often surarounds the humeral head permits the cuff muscles to perform many different movements. The cuff muscles have three basic functions: 1) They
to perform different movements, they provide muscular balance, and they stabilize
the shoulder by holding the humerus into the glenoid. The glenoid has a ring of
fibrous cartilage to support the joint called the labrum. The movement of the
bones at the joint are lubricated by sinovial membranes or articular cartilage that
cover the head of the humerus and the face of the scapula. The scapula extends up
and around the shoulder joint at the rear to form a roof called the acromion and
around the front of the shoulder to form the coracoid process. The acromion is a

scapular process arising from three ossification centers or places of...

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