7.9 Pectoral Girdle

  • pectoral girdle pertaining to the chest

  • each pectoral, girdle, or shoulder girdle, is composed of two parts- an anterior bone called the clavicle, and a scapula on the posterior portion

  • it is open in the back between the scapula, and the sternum separates its bones in front

  • Clavicle

  • The clavicle is a cylinder, rod like bone with an elongated S shape

  • A clavicle is located at the base of the neck as part of each of the pectoral girdle’s

  • The clavicles brace, the freely, movable scapular, helping to hold the shoulders in place

  • they also provide attachments for muscles of the upper limbs, chest, and back

  • The clavicle is structurally weak because of it and long gated double curve

  • Scapula

  • The scapula is a broad, somewhat triangular bone located on each side of the upper back

  • the acromion process articulates with the clavicle and provides attachment for muscles of the upper limb and chest

  • the coracoid process also provides attachments for upper limb and chest muscles

  • the glenoid cavity articulates with the head of the humerus

  • Practice 7.9

  • The pectoral girdle consist of the two clavicle and two scapula

  • The pectoral girdle provide support for the upper limbs, and serves as an attachment site for muscles that move their arms