Lamellae are rings of extracellular matrix in compact and spongy bone. These rings are composed mostly of extracellular matrix. Osteons are only found in compact bone and they contain concentric lamellae. Trabeculae of spongy bone contain parallel lamellae. You would expect all types of lamellae to contain tiny spaces known as canaliculi. True False The following are spaces found within bone: lacunae, central canals, and canaliculi. True False Collagen is produced by ribosomes on the RER within osteoblasts. These proteins move through the endomembrane system (which includes the nuclear envelope, endoplasmic reticulum, the Golgi apparatus, and mitochordria) and are exported into the extracellular matrix of bone. True False
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Lamellae are rings of extracellular matrix in compact and spongy bone. These rings are composed mostly of extracellular matrix. - True Show more…
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Check Your Recall Label the following parts of compact bone on Figure 7.10: Canaliculi, Central canal, Concentric lamellae, Endosteum, Interstitial lamellae, Lacunae with osteocytes, Osteon, Perforating canal, Periosteum, Trabeculae of spongy bone. FIGURE 7.10: Microscopic anatomy of compact bone tissue. Mark the following statements as true (T) or false (F). If the statement is false, correct it. 1. True 2. False: Osteoclasts secrete bone matrix. 3. True 4. False: Compact bone is the hard outer bone composed of spicules called trabeculae. 5. True 6. False: Circumferential lamellae are located between osteons. 7. True The matrix of bone consists of extracellular collagen fibers and calcium hydroxyapatite crystals. Choices a and b only are correct.
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Please Compact and spongy bone have the same cells and extracellular matrix, but differ in the 3D arrangement of tissue and blood vessels. In compact bone, osteocytes are arranged in three types of layers (lamellae) and nourished through three types of canals (highways for blood vessels). In contrast, in spongy bone, lamellae are often not present, and blood vessels travel between trabeculae, rather than through bony canals. Compact bone Spongy bone Match each compact or bony structure with its description: You may use answers more than once:
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