A&P1 Chapter 7 Lecture 3

Question 1

Lamellae

Answer 1

Layers of the matrix, arranged in a concentric manner, surrounding a central Haversian canal

Question 2

Haversian canal

Answer 2

Central hole within osteon, contains blood vessels and nerves

Question 3

What is each lamella connected to others through

Answer 3

Canaliculi

Question 4

Osteon

Answer 4

Structural unit of bone, contains lamellae, Central canal, lacunae, canaliculi, perforating canals, osteocytes

Question 5

How are collagen fibeers arranged within lamellae

Answer 5

Corkscrew down the lamellae, like a helix, one direction in one lamella, opposite in the next

Question 6

What is the function of collagen fibers in lamellae

Answer 6

Structural support

Question 7

Lacunae

Answer 7

Small cavities, contain osteocytes

Question 8

What are the canals that bring vessels and nerves of the periosteum to the central canals and deeper into the bone tissue

Answer 8

Perforating/Volkmann’s canals

Question 9

How are volkmann’s canals oriented in relation to central canals

Answer 9

Right angles

Question 10

What is the beginning of perforating canals

Answer 10

Foramina

Question 11

What are central and perforating canals lined by

Answer 11

Endosteum

Question 12

What part of compact bone is not arranged in osteons

Answer 12

Inner and outer boundaries

Question 13

How do lamellae run in the outer and inner parts of the bone

Answer 13

Parallel to the bone surface

Question 14

What are lamellae not in osteons called

Answer 14

Circumferential lamellae

Question 15

What do circumferential lamellae surround

Answer 15

Compact and spongy bone

Question 16

What part of the bone (lamellae, osteons, etc) does growth happen

Answer 16

Circumferential lamellae

Question 17

What lamellae exist between osteons

Answer 17

Interstitial Lamellae

Question 18

Interstitial lamellae

Answer 18

Remains of old osteons that have broken down as the bone has grown, then remodeled, irregular shape

Question 19

What is spongy bone arranged in

Answer 19

trabeculae

Question 20

Are there osteons in spongy bone

Answer 20

No

Question 21

What does the matrix of spongy bone contain

Answer 21

Irregularly arranged lamellae, osteocytes, and canaliculi

Question 22

What supplies nutrients to spongy bone

Answer 22

Capillaries in endosteum

Question 23

Trabeculae

Answer 23

Little columns with spaces in between them

Question 24

Why is a central canal not needed in spongy bone

Answer 24

Marrow between trabeculae, each osteocyte is not very far from blood

Question 25

How do trabeculae align

Answer 25

Along lines of mechanical stress or pull of muscle

Question 26

Why do trabeculae align along lines of stress

Answer 26

Adds strength without weight

Question 27

Bone marrow

Answer 27

Soft tissue that occupies bone cavities

Question 28

Types of bone marrow

Answer 28

Red and yellow

Question 29

What is another name for red marrow

Answer 29

Myeloid Tissue

Question 30

What type of marrow is in all cavities in infants

Answer 30

Red marrow

Question 31

What is the term for a tissue that produces blood cells (like red marrow)

Answer 31

Hemopoietic tissue

Question 32

What happens in terms of bone marrow in adults

Answer 32

Most red marrow is replaced by yellow marrow (fatty type), red marrow remains in small locations

Question 33

Yellow marrow

Answer 33

Fatty type, mainly consisting of fat cells, isn't able to produce fat

Question 34

Where is red marrow found in adults

Answer 34

Spongy areas of head of femur and humerus, flat bones