Which is part of pectoral girdle? (a) Glenoid cavity (b) Sternum (c) Ilium(d) Acetabulum

 

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Which is part of pectoral girdle? 
(a) Glenoid cavity 
(b) Sternum
 (c) Ilium
(d) Acetabulum

Ans:(a) Glenoid cavity 

Pectoral and Pelvic girdle bones help in

the articulation of the upper and the lower limbs

respectively with the axial skeleton. Each

girdle is formed of two halves. Each half of

pectoral girdle consists of a clavicle and a

scapula (Figure 20.9). Scapula is a large

triangular flat bone situated in the dorsal part

of the thorax between the second and the

seventh ribs. The dorsal, flat, triangular body

of scapula has a slightly elevated ridge called

the spine which projects as a flat, expanded

process called the acromion. The clavicle

articulates with this. Below the acromion is a

depression called the glenoid cavity which

articulates with the head of the humerus to

form the shoulder joint. Each clavicle is a long

slender bone with two curvatures. This bone

is commonly called the collar bone.

Pelvic girdle consists of two coxal bones

(Figure 20.10). Each coxal bone is formed by

the fusion of three bones – ilium, ischium and

pubis. At the point of fusion of the above bones

is a cavity called acetabulum to which the thigh

bone articulates. The two halves of the pelvic

girdle meet ventrally to form the pubic

symphysis containing fibrous cartilage.