Perforating canal Trabeoulae of spongy bone HOURE 7.10 icroscop anatomy of compa

Question

Perforating canal Trabeoulae of spongy bone HOURE 7.10 icroscop anatomy of compact bone thsue. TruelFalse: Mark the following statements as true ( or false (). it the statement is fake, correct it to make it a true statement The periosteum contains osteoblasts and osteocytes F Osteoclasts secrete bone matrix F compact borne is the hard, outer bone Compact bone is composed of spicudes called trabeculae. Spongy bone houses red and yelkow bone marrow E Circumferential larmellae are located between ostcons The extracellular matrix of bone consists of a coilagen fbers b. calcum hydroxyapatite crystals. c ground substance e. Choices a, b, and c are correct. d Choies a and b only are corect. - UNIT 7 Introduction to the Skeletal System

Explanation / Answer

a. The periosteum contains osteoblasts and osteocytes - False

The periosteum is a dense, white covering on the diaphysis and it consists of two layers. 1. fibrous layer – This is the outer layer of dense, irregular connective tissue containing blood vessels, lymphatic vessels and nerve fibers. 2. osteogenic layer - This layer is the inner layer containing elastic fibers, blood vessels, osteoblasts (boneforming cells), and osteoclasts (bone-destroying cells).

Mature bone cells or osteocytes are located in spaces called lacunae where each ring of lamella joins the next.

b. Osteoclasts secrete bone matrix – False

Bone is a dynamic tissue that is constantly being reshaped by osteoblasts, which produce and secrete matrix proteins and transport mineral into the matrix, and osteoclasts, which break down the tissues.

c. Compact bone is the hard, outer bone – True

Cortical (Compact) Bone forms the hard outer shell of all bones. It is the strongest and densest form of bone than cancellous (Spongy) bone in the body. However, it also contains many tiny passages for blood vessels and nerves and houses the cells that repair and maintain bones.

d. Compact bone is composed of spicules called trabeculae. – False

Spongy bone consists of an irregular lattice or network of thin, tiny spicules, flat plates of bone called trabeculae ("little beams"). The spaces between the trabeculae of some bones are filled with red bone marrow. The trabeculae contain irregularly arranged lamella and osteocytes which are connected to one another by canaliculi.

e. Spongy bone houses red and yellow bone marrow – True

Spongy (Cancellous) bone is a network of irregularly-shaped sheets and spikes of bone (trabeculae). The trabeculae are only a few cell layers thick. The spaces between the trabeculae contain red or yellow marrow, depending on a person's age and on which bone it is. Red bone marrow is present in the bone cavities of an infant, and with increasing age, more and more red bone marrow is replaced by yellow bone marrow which functions in fat storage.

f. Circumferential lamellae are located between osteons – False

Immediately beneath the periosteum and endosteum a few lamella are found which run parallel to the inner and outer surfaces of the bone. They are the circumferential lamellae and endosteal lamellae. Circumferential Lamellae - a bony lamella that encircles the outer or inner surface of a bone. Interstitial Lamella is located in between osteons.

2. The extracellular matrix (ECM) of bone is composed of

Ans: Choices a and b only correct

In the case of bone, the extracellular matrix (ECM) is composed of crystals of hydroxyapatite and long collagen proteins. The hydroxyapatite and collagen work together to give bone its unique properties of strength, compressive resistance, and flexibility.

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