For intramembranous ossification to take place, which of the following is necessary?
An epiphyseal plate must be present.
The cartilage matrix begins to deteriorate.
A medullary cavity forms.
A bone collar forms around the cartilage model.
Fibrous connective tissue membranes must be present
The Correct Answer is A
Choice A reason: An epiphyseal plate is involved in endochondral ossification, not intramembranous ossification. It allows for longitudinal growth in long bones but is irrelevant to flat bone formation.
Choice B reason: Cartilage matrix deterioration is a hallmark of endochondral ossification, where cartilage is replaced by bone. Intramembranous ossification does not involve a cartilage precursor.
Choice C reason: The medullary cavity forms during endochondral ossification as part of the development of long bones. It is not a feature of intramembranous ossification.
Choice D reason: A bone collar forms around the cartilage model during endochondral ossification. Intramembranous ossification bypasses the cartilage stage entirely.
Choice E reason: Intramembranous ossification begins within fibrous connective tissue membranes. Mesenchymal cells differentiate directly into osteoblasts, which lay down bone matrix. This process is essential for forming flat bones like those of the skull and clavicle.
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Related Questions
Correct Answer is A
Explanation
Choice A reason: Communication is not a direct function of the skeletal system. While the skeletal system supports structures involved in communication (e.g., the skull housing the brain), it does not itself facilitate communication.
Choice B reason: Support is a primary function of the skeletal system. It provides a rigid framework that supports the body and maintains its shape.
Choice C reason: The skeletal system stores essential minerals such as calcium and phosphate, which can be released into the bloodstream as needed.
Choice D reason: Hematopoiesis, or the production of blood cells, occurs in the red bone marrow found within certain bones. This is a vital function of the skeletal system.
Choice E reason: Bones serve as anchoring points for muscles, allowing movement through the leverage of joints and tendons.
Correct Answer is E
Explanation
Choice A reason: Intercarpal joints are planar joints that allow gliding movements between the carpal bones. They do not have the saddle-shaped surfaces characteristic of saddle joints.
Choice B reason: Metacarpophalangeal joints are condyloid joints that allow flexion, extension, abduction, and adduction. They are not saddle joints.
Choice C reason: Carpometacarpal joints of the phalanges do not exist. Phalanges articulate with metacarpals, not carpals. This option is anatomically incorrect.
Choice D reason: Interphalangeal joints are hinge joints that allow flexion and extension. They do not have the concave-convex structure of saddle joints.
Choice E reason: The carpometacarpal joint of the thumb is the correct answer. It is a true saddle joint formed between the trapezium and the first metacarpal. It allows a wide range of motion, including opposition, which is essential for grasping.
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