Histology-World!

 

 

 

Histology Testbank: Bone 4a

 

Instructions: For each histology question, pick the one best answer. This histology test bank is also useful for the histology questions on the USMLE (USMLE step 1).

1.
What is the mature bone cell called?
a. Osteoclast
b. Osteon
c. Osteocyte
d. Osteoblast
e. Osteoid

Answer: c

An osteoclast is a multinucleated cell involved in the degradation of bone. It is a bone resorbing cell.

An osteon is the cylindrical structure with bone. An osteon is also called a Haversian system.

The mature bone cell is called an osteocyte. It sits in a space, called a lacuna.

An osteoblast is an immature bone cell. The osteoblast is the bone forming cell.

Osteoid is unmineralized bone matrix.

2.
What is immature bone?
a. Dense bone
b. Woven bone
c. Cancellous bone
d. Compact bone
e. Spongy bone

Answer: b

Compact bone is also called dense bone. Compact bone has the Haversian system.

Immature bone is woven bone. It is nonlamellar bone or bundle bone.

Spongy bone is also referred to as cancellous bone. The mineralized tissue is seen as spicules. Marrow spaces are also present.

3.
What is unmineralized bone matrix?
a. Osteoclast
b. Osteon
c. Osteocyte
d. Osteoblast
e. Osteoid

Answer: e

An osteoclast is a multinucleated cell involved in the degradation of bone. It is a bone resorbing cell.

An osteon is the cylindrical structure with bone. An osteon is also called a Haversian system.

The mature bone cell is called an osteocyte. It sits in a space, called a lacuna.

An osteoblast is an immature bone cell. The osteoblast is the bone forming cell.

Osteoid is unmineralized bone matrix.

4.
What are the collagen fibers that extend into bone at an angle called?
a. Canaliculi
b. Sharpey's fibers
c. Trabeculae
d. Tome's process
e. Lacuna

Answer: b

Canaliculi are the little tunnels within bone.

Sharpey's fibers are collagen fibers that extend into a bone at an angle.

Trabeculae are the spicules seen with spongy bone.

Tome's process is seen in teeth, this process is responsible for enamel production.

An osteocyte rests in a space called a lacuna.

5.
Which cell is the mature bone cell?
a. Chondrocyte
b. Chondroblast
c. Osteocyte
d. Osteoclast
e. Bone lining cell

Answer: c

The mature cell in cartilage is a chondrocyte. It rests in a lacunae surrounded by matrix. A chondroblast is an immature cartilage cell which produces the cartilaginous matrix. An osteocyte is a mature bone cell. An osteoclast is a bone cell which is involved in resorption of bone. A bone lining cell is a resting osteoblast.

6.
What is the lining of the inner bone on the side which abuts the medullary cavity?
a. Perimysium
b. Periosteum
c. Perichondrium
d. Perineurium
e. Endosteum

Answer: e

The perimysium is the connective tissue sheath which surrounds muscle fascicles.

The periosteum is the connective tissue covering of a bone.

The perichondrium is the connective tissue which surrounds cartilage.

The perineurium is the covering of nerve fascicles.

The endosteum is the lining of the inner bone (the side which abuts the medullary cavity).

Note from Sarah Bellham: The prefix "peri" means around, such as in the word "perimeter". The prefix "endo" means within or inner, such as in "endosteum", "endocrine", "endoscope".

7.
What forms the skeleton of the fetus?
a. Elastic cartilage
b. Hyaline cartilage
c. Fibrocartilage
d. Spongy bone
e. Compact bone

Answer: b

Hyaline cartilage forms the skeleton of the fetus. The cartilage forms a template of the bones. Endochondral ossification will occur during the childhood, replacing the hyaline cartilage with bone.

8.
Which of the following is a multinucleated cell?
a. Osteoclast
b. Osteon
c. Osteocyte
d. Osteoblast
e. Osteoid

Answer: a

An osteoclast is a multinucleated cell involved in the degradation of bone. It is a bone resorbing cell.

An osteon is the cylindrical structure with bone. An osteon is also called a Haversian system.

The mature bone cell is called an osteocyte. It sits in a space, called a lacuna.

An osteoblast is an immature bone cell. The osteoblast is the bone forming cell.

Osteoid is unmineralized bone matrix.

9.
What is spongy bone
a. Immature bone
b. Compact bone
c. Cancellous bone
d. Dense bone
e. Woven bone

Answer: c

Compact bone is also called dense bone. Compact bone has the Haversian system.

Immature bone is woven bone. It is nonlamellar bone or bundle bone.

Spongy bone is also referred to as cancellous bone. The mineralized tissue is seen as spicules. Marrow spaces are also present.