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in Man-Movement and Locomotion by (45.7k points)
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Write the structure of girdles and their significance.

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Pectoral Girdle: 

  • It supports fore limbs & protects chest organs. 
  • It has two equal halves. 
  • Each half has a clavicle & a scapula-coracoid bones. 
  • The clavicle is a rod-like bone which is also called as collar bone. 
  • The scapula is a broad & flat bone which is found in all mammals. 
  • The coracoid is get fused with the scapula & found in the form of a coracoid process. 
  • The supra scapula is absent in the pectoral girdle of Man. 
  • The dorsal side of the scapula has a spine. The anterior & ventral extension of the spine is called an acromial process. 
  • The posterior process of acromial in the rabbit is called the acromion process. 
  • The head of the scapula-coracoid has a cavity, the glenoid cavity. 
  • The head of the humerus bone articulates to the glenoid cavity

Pelvic Girdle: 

  • It supports hind limbs. 
  • It has 2 equal halves & each half is called as os-innominate. 
  • Both the os-innominate remain united by pubic symphysis which is made up of fibrous cartilage. 
  • The pelvic girdle of the rabbit is W – shaped. 
  • Each os – innominate of the rabbit has 4 bones – Ilium, Ischium, Pubic & Cotyloid. 
  • Each os – innominate has a groove, the acetabulum. The head of the femur articulates with it. 
  • In the rabbit, the pubic bone does not participate in the formation of the acetabulum. There is a small cotyloid bone between the acetabulum & the pubic. 
  • In man, cotyloid bone is absent. Hence, each os-innominate has 3 bones – Ileum, Ischium & Pubic. All of them participate in the formation of the acetabulum. 
  • There is an obturator foramen between pubic & ischium bones.

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