Skeletal System 5.2 Layers in Long Bones

Question 1

Define Periosteum:

Answer 1

Layer of Connective Tissue that surrounds bones

Location: Outer bone surfaces, except for joints

Contains 2 layers: Fibrous + Osteogenic layer

Question 2

Define the Fibrous Layer:

Answer 2

Tough outer layer of the Periosteum

Contains: Collogen fibers

Function: Protects + carries nerves/blood vessels

Question 3

Define the Osteogenic Layer:

Answer 3

The cellular, inner layer of the periosteum

Contains: Osteogenic cells, Osteoblasts, Osteoclasts

Function: Bone growth + healing

Question 4

Define the Endosteum:

Answer 4

Connective Tissue that lines the megillary cavity

Location: Inner surface of the Diaphysis

Contains: Osteogenic cells, Oseoblasts, Osteoclasts

Function: Bone growth + remodeling

Question 5

Define the Epiphyseal Plate

Answer 5

The growth plate

Location: The Metaphysis

Tissue Type: Hyalind Cartilage

Contains: Osteoblasts + Oseoclasts

Function: Longitudinal Bone Growth

on X-rays= dark line

Only present in children for elongation of limbs

Question 6

Define the Epipyseal Line:

Answer 6

When long bone has stopped growing hyland cartilage in growth plate is replaced by bone

on x-rays= light, radioapaque(solid) line