Pectoral Girdle Structure and Bones — NEET Biology
📚 Practice ConceptPectoral 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. 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.
Which of the above statements regarding the pectoral and pelvic girdles are NOT correct? S1: Each coxal bone of the pelvic girdle is formed by the fusion of the ilium, ischium, and pubis, contributing to the acetabulum. S2: The pectoral girdle comprises two halves, with each half consisting of a clavicle and a scapula, forming the shoulder joint with the femur. S3: The pubic symphysis, where the two halves of the pelvic girdle meet ventrally, is characterised by the presence of hyaline cartilage, allowing limited movement. S4: The scapula is a large triangular flat bone found on the dorsal part of the thorax, and its glenoid cavity articulates with the head of the humerus. S5: The acromion process, an elevated ridge on the scapula, serves as the articulation point for the clavicle.
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