Question

multiple choice 2 points

thin layer of slightly denser spongy bone that separates an adults epiphysis...

metaphysis
diaphysial line
growth plate
epiphyseal line
osteum

Explanation:

Analyze the question stem

The question asks for the name of the thin layer of slightly denser spongy bone that separates an adult's epiphysis from the diaphysis.

Evaluate the anatomical structures

• Metaphysis: The transitional zone where the diaphysis joins the epiphysis, containing the growth plate in growing bones.
• Diaphysial line: Not a standard anatomical term for this boundary.
• Growth plate (epiphyseal plate): A layer of hyaline cartilage in growing children/adolescents, not adults.
• Epiphyseal line: The remnant of the epiphyseal plate in adults, appearing as a thin line of denser spongy bone.
• Periosteum: The fibrous membrane covering the outer surface of bones.

Apply mastered concepts

Using the Long Bone Anatomy and Epiphysis Structure knowledge points, we identify that when longitudinal bone growth ceases in adulthood, the cartilage of the epiphyseal plate is completely replaced by bone, leaving behind the epiphyseal line as a distinct boundary.

Answer:

• metaphysis
• diaphysial line
• growth plate
• epiphyseal line (Correct answer)
• periosteum