The rings of matrix within an osteon are called:
circumferential lamellae
concentric lamellae
interstitial lamellae
sequential lamellae
The Correct Answer is B
A. circumferential lamellae
These are outer and inner rings that encircle the entire compact bone structure, not the rings within an osteon.
B. concentric lamellae
These are the circular layers of bone matrix surrounding the central (Haversian) canal within each osteon.
C. interstitial lamellae
These are incomplete lamellae found between osteons, representing old osteons that have been partially resorbed.
D. sequential lamellae
This is not a valid anatomical term used to describe lamellae in bone.
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Related Questions
Correct Answer is D
Explanation
A. osteoclasts
Osteoclasts are responsible for bone resorption, not formation. They help remodel the bone later in healing but don’t form the callus.
B. osteochondral replacement cells
Not a standard term. Possibly a misnomer. The relevant cells are progenitors, not “replacement cells.”
C. osteoblasts
Osteoblasts lay down new bone but are not the first cells involved in forming the soft (fibrocartilaginous) callus during early healing.
D. osteochondral progenitor cells
These stem-like cells differentiate into both chondroblasts and osteoblasts, and are crucial in forming the initial callus (a mix of cartilage and woven bone) during bone repair.
E. chondroclasts
Chondroclasts break down cartilage. They are not involved in callus formation, but in later remodeling.
Correct Answer is C
Explanation
A. thin skin has five strata
Thin skin has only four strata and lacks the stratum lucidum, which is present only in thick skin (e.g., palms and soles).
B. thin and thick skin have abundant hair follicles
Thick skin lacks hair follicles entirely. Hair is present only in thin skin.
C. thick contains a stratum lucidum, corneum & granulosum
These three layers are prominent in thick skin, providing extra protection in high-friction areas like palms and soles.
D. thick is more widely distributed than thin
Thin skin is more widely distributed over the body. Thick skin is limited to palms and soles.
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