Unit 4-Skeletal System

Question 1

2 Major Divisions of the Skeleton

Answer 1

Axial Skeleton (Central core)
Appendicular Skeleton (Limbs & girdles)

Question 2

6 Parts of Skull

Answer 2

Skull
Auditory Ossicles (Ear bones)
Hyoid Bone (Supports tongue)
Vertebral Column (Spine)
Bony Thorax (Ribs & Sternum)
Sacrum & Coccyx (Base of spine)

Question 3

Appendicular Skeleton (Limbs & girdles)

Answer 3

Pectoral Girdle (Clavicle & Scapula)
Upper Extremities (Humerus, Radius, Ulna, Carpals, Metacarpals, Phalanges)
Pelvic Girdle (2 Coxal Bones)
Lower Extremities

Question 4

4 Major Classes of Bones

Answer 4

Long
Short
Flat
Irregular

Question 5

Ribs Bone Type

Answer 5

Flat

Question 6

Head Bones Type

Answer 6

Flat but face is Irregular

Question 7

Vertebrae bone type

Answer 7

Irregular

Question 8

2 Types of Osseous Tissue

Answer 8

Spongy Bone
Compact Bone

Question 9

Spongy Bone

Answer 9

Light, porous, contains red marrow

Question 10

Compact Bone

Answer 10

Dense, strong, contains osteons

Question 11

Epiphysis (Proximal & Distal)

Answer 11

Ends of long bones, contains spongy bone

Question 12

Diaphysis

Answer 12

Shaft of the bone, contains compact bone

Question 13

Compact Bone

Answer 13

Strong outer layer

Question 14

Spongy Bone

Answer 14

Light, holds marrow

Question 15

Articular Cartilage

Answer 15

Covers ends for smooth movement

Question 16

Epiphyseal Line

Answer 16

Growth plate remnant

Question 17

Periosteum

Answer 17

Outer covering of bone

Question 18

Medullary Cavity

Answer 18

Hollow space in shaft, holds marrow

Question 19

Endosteum

Answer 19

Lines medullary cavity

Question 20

Yellow Bone Marrow

Answer 20

Fat storage

Question 21

Osteon (Haversian System)

Answer 21

Structural unit of compact bone

Question 22

Lamellae

Answer 22

Layers of bone matrix

Question 23

Central (Haversian) Canal

Answer 23

Carries blood vessels & nerves

Question 24

Volkmann’s Canal

Answer 24

Connects central canals

Question 25

Osteocyte in Lacuna

Answer 25

Bone cell in cavity

Question 26

Lacunae

Answer 26

Small spaces housing osteocytes

Question 27

Perforating (Sharpey’s) Fibers

Answer 27

Attach periosteum to bone

Question 28

Periosteum

Answer 28

Outer fibrous layer of bone

Question 29

Endosteum

Answer 29

Inner lining of bone cavity

Question 30

Canaliculi

Answer 30

Tiny channels for nutrient exchange

Question 31

Compact Bone

Answer 31

Dense outer bone layer

Question 32

Spongy Bone – Inner bone with marrow

Answer 32

Inner bone with marrow