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Bone Growth and Joints. Bone growth and remodeling. Two (three) types of bone: Membrane bone – bone forming within connective tissue (=dermal bone) Neurocranium (skull), scapula Osteoblasts  osteoid  trabeculae (small beam). Types of bone (continued). Cartilage replacement bone

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Bone growth and joints l.jpg

Bone Growthand Joints


Bone growth and remodeling l.jpg
Bone growth and remodeling

  • Two (three) types of bone:

  • Membrane bone – bone forming within connective tissue (=dermal bone)

    • Neurocranium (skull), scapula

      Osteoblasts  osteoid  trabeculae (small beam)


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Types of bone (continued)

  • Cartilage replacement bone

    • Endochondral bone – bone that forms within cartilage

    • Perichondral bone – forms in CT on surface of bone

    • Long bones


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Development of the femur in a late embryo or fetus of a mammal.

A – original cartilage being replaced by bone on periphery (perichondral bone)

original cartilage being replaced by bone within cartilage (endochondral bone)

Blue = cartilage

Purple = calcified cartilage

Pink = bone


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B – enlarged detail of bone formation mammal.

Blue = cartilage

Purple = calcified cartilage

Pink = bone


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Notes on Joints (articulations) mammal.

  • Structure and function dependent upon:

    • Degree and direction of movement needed

    • Forces acting upon the joint

    • Nature of the material at articulation

      • C – C

      • B – B

      • C – B


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Sutural ligament mammal.

Periosteum

Dermal bone

Dermal bone

Classification based on overall movement and material

  • Synarthroses – restricted movement

    • Sutures

1. Coronal suture


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Functional synarthroses mammal.

  • Reinforced – look at woodpecker skull

Not synarthroses

nasal

frontal


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Basioccipital mammal.

Basisphenoid

Spheno-occipital

Synchondrosis


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  • Sympases mammal.

    • Fibrocartilage

    • Some elastin

1.Symphysis mentalis

Also:

2.Synchondrosis sphenooccipitalis3.Synchondrosis intraoccipitalis anterior4.Fonticulus posterior5.Synchondrosis intraoccipitalis posterior

Pubic symphysis


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Diarthroses (synovial joints) mammal.

  • Lots of movement

    • Knee

    • Jaw


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Functional Types of Joints mammal.

Gliding joints


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