a and p chapter 7 pg 1 of notes
Terms
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- bone is a __ tissue so it has a ___ and tis the most ___ and has several functions and is an _____
- connective; matrix; rigid; organ
- how are they classified?
- shape ; what are they (5)
- long bones?
- have long longitudianl axes and expanded ends; femur
- short bones-
- cubelike; lengths and widths are roughly equal; carples
- flat bones-
- platelike structures w broad surfaces ; sapulae
- irregular bones-
- variety of shape connected to several other bones, facial bones
- sesamoid (round) bones-
- small and nodular and are embedded within tendons adgacent to joints, where the tendons are compressed; kneecap
- about the medulary cavity-
- starts as red bone marrow witch actively produced blood cells, as long bone matures it goes into yellow bone marrow whcih stores fat and is inactive in producing blood
- about the trabecuale-
- bone plates found in epephysis that suppoprt ends of long bones that have alot of pressure
- what can you see in a bone with microscope?
- osteonic canal, lamellae, lacunae, osteocytes, canaliculi, perroating canals- ensure better blood supply and osteon- (1000s per bone)
- ossification-
- converting cartilage (hyaline) or primitive sheets of C.t. into bone and this takes up to 25 yrs
- intramembranous ossifaction- what kind of bone
- sheets of primitive c.t. appear at sites of future bones; primitive c.t. cells collect around blood vessels in these layers; c.t. cells differentiate into osteoblasts, which deposit spongey bone; osteoblasts become osteocytes when bony matrix completely surrounds them; c.t. on the surface of each developing structure forms a periosteum; osteoblasts on the inside of the periosteum depoist compact bone over the spongy gone (flat bone)
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endochondral ossification-
what kind of bone - masses of hyaline cartilage form modles of future bones; cartilage tissue breaks down, periosteum develops; blood vessels and differentiating osteoblasts from the periosteum invade the disintegreating tissue; osteoblasts form spongy bone in the sapce occupied by carilage; osteoblasts become osteocytes when bony matrix completely surrounds them; osteoblasts beneath the periosteum deposit compact bone around spongy bone (long bone)
- does growth in lenth stop or diameter?
- length only