DR HASSAN 41) Thoracic vertebrae can be distinguished from other vertebrae by th
ID: 179207 • Letter: D
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DR HASSAN 41) Thoracic vertebrae can be distinguished from other vertebrae by the presence of transverse processes b) transverse foramina c) facets for the articulation of ribs d) notched spinous processes e) costal cartilages 42) Which of the following is not a component of the appendicular skeleton? a) scapula b) hyoid c) femur d) humerus e) coxa. 43) The pectoral girdle contains the a) humerus b) manubrium c) stemum d) scapula e) all of the above 44) What tissue is primarily responsible for stabilizing, positioning, and bracing the pectoral girdle? tendons b) ligaments c) the joint shape muscles e) none of the above 45) The bone that articulates with the scapula at the glenoid fossa is the: a) radius b) ulna c) humerus d) femur e) tibiaExplanation / Answer
1. The thoracic vertebrae can be distinguished from other vertebraes by the presence of facets of articulation of ribs. In thoracic vertebrae the transverse costal facets provides an additional area of articulation. The transverse factes aticulate with the turbercle of the rib of the same level.
2. Appendicular skeleton is the portion of skeleton of vertebrates consisting of bones and cartilages that support the appendages. Coxa is not a component of appendicular skeleton.
3. The pectoral girdle or shoulder girdle is the set of bones which connects the arm to the axial skeleton on each side. In humans, it consists of clavicle and scapula.
4. Muscles are responsible for stabilizing, positioning, and bracing the pectoral girdle. Pectoral girdle positions the shoulder joint and provide a base for shoulder movement.
5. Humerus is the bone that articulates with the scapula at glenoid fossa. In dinosaurs, the main bones of pectoral girdle are scapula and coracoid which articulates with clavicle. The place on scapula where it articulated with humerus is called glenoid. .
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