Skeletal Flashcards
ppt
Functions of Bones
- Support
- Protect
- Muscle attachement
- Hemopoiesis
- red bone marrow
- Storage of manerals ( phosphorus, Calcium)
Histology of bones
Components
1. Bone Cells
2. Matrix
Collagenous Fibers
- Give resilience to bones
Calcified ground substance
- Give hardness to bones
- Calcium phosphate
- Calcium Carbonate
Bone cells
Osteoblast
Osteocytes
Osteoclasts
- embryonic bone cells
- active in bone formation
Osteoblasts
mature osteoblasts
Osteocytes
bone reabsorption / resorption and remodeling
Osteoclasts
MAINTAINING THE BONE
- Endocrine system control
- Parathormone
- Calcium release
hypocalcemia- increased blood calcium (PTH & Cal
release)
- Calcium release
- Calcitonin
- hypercalcemia - decreased blood calcium
(calcitonin release)
- hypercalcemia - decreased blood calcium
CLASSIFICATION OF BONES
according to structures
- COMPACT / DENSE
- SPONGY / CANCELLOUS
CLASSIFICATION OF BONES
according to shape
- LONG
- SHORT
- FLAT
- IRREGULAR
- SESAMOID
(develops within a tendon)
CLASSIFICATION OF BONES
according to development
ENDOCHONDRAL / CARTILAGINOUS
INTRAMEMBRANOUS
- formed via endochondral/ intracartilaginous ossification
CARTILAGE —————> BONE
ENDOCHONDRAL / CARTILAGINOUS
- formed via intramembranous ossification
MEMBRANE —————> BONE
CLASSIFICATION OF BONES
according to location
Axial - 80 bones
Appendicular - 126 bones
AXIAL SKELETON
- SKULL
- OSSICLES
- HYOID
- STERNUM
- RIBS
- VERTEBRAE
How many bones does cranial have?
8