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This article is about the cambium layer of bones. Periosteum_sentence_0

For the cambium layer of trees, see Vascular cambium. Periosteum_sentence_1


LocationPeriosteum_header_cell_0_2_0 Outer surface of all bonesPeriosteum_cell_0_2_1
LatinPeriosteum_header_cell_0_4_0 PeriosteumPeriosteum_cell_0_4_1
MeSHPeriosteum_header_cell_0_5_0 Periosteum_cell_0_5_1
TA98Periosteum_header_cell_0_6_0 Periosteum_cell_0_6_1
TA2Periosteum_header_cell_0_7_0 Periosteum_cell_0_7_1
THPeriosteum_header_cell_0_8_0 Periosteum_cell_0_8_1
FMAPeriosteum_header_cell_0_9_0 Periosteum_cell_0_9_1

The periosteum is a membrane that covers the outer surface of all bones, except at the articular surfaces (i.e. the parts within a joint space) of long bones. Periosteum_sentence_2

Endosteum lines the inner surface of the medullary cavity of all long bones. Periosteum_sentence_3

Structure Periosteum_section_0

The periosteum consists of dense irregular connective tissue. Periosteum_sentence_4

It is divided into an outer "fibrous layer" and inner "cambium layer" (or "osteogenic layer"). Periosteum_sentence_5

The fibrous layer contains fibroblasts, while the cambium layer contains progenitor cells that develop into osteoblasts. Periosteum_sentence_6

These osteoblasts are responsible for increasing the width of a long bone and the overall size of the other bone types. Periosteum_sentence_7

After a bone fracture, the progenitor cells develop into osteoblasts and chondroblasts, which are essential to the healing process. Periosteum_sentence_8

As opposed to osseous tissue, the periosteum has nociceptive nerve endings, making it very sensitive to manipulation. Periosteum_sentence_9

It also provides nourishment by providing the blood supply to the body from the marrow. Periosteum_sentence_10

The periosteum is attached to the bone by strong collagenous fibers called Sharpey's fibres, which extend to the outer circumferential and interstitial lamellae. Periosteum_sentence_11

It also provides an attachment for muscles and tendons. Periosteum_sentence_12

The periosteum that covers the outer surface of the bones of the skull is known as the "pericranium", except when in reference to the layers of the scalp. Periosteum_sentence_13

History Periosteum_section_1

The word periosteum is derived from the Greek Peri-, meaning "surrounding", and -osteon, meaning "bone". Periosteum_sentence_14

The Peri refers to the fact that the Periosteum is the outermost layer of long bones, surrounding other inner layers. Periosteum_sentence_15

Additional images Periosteum_section_2


  • Periosteum_item_0_0

See also Periosteum_section_3


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