Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
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.
