Bone structure and MSK histology Flashcards
variation of muscle cells
striated
unbranched
multinucleate
what are muscle fibres grouped into
bundles called fasicles
a muscle typically contains several fascicles
what is the connective tissue that surrounds the muscle as a whole
epimysium
what is the connective tissue arund a single fasicle
perimysium
what is the connective tissue around a single muscle fibre
endomysium
unit of contractio. of muscle cells
sarcomeres
type 1 muscle fibre overview
- relatively slow contracting fibres
- depend on oxidative metabolism
- have abundant mitochondria and myoglobin
- resistant to fatigue - produce relatively less force
- often called ‘red’ fibres
type 2a muscle fibre overview
intermediate between the other two
- relatively fast
- reasonably resistant to fatigue
- relatively uncommon
type 2b muscle fibre overview
- fast contracting
- depend on anaerobic metabolism
- few mitochondria and less myoglobin than type 1
- fatigue relatively easy and produce greater force
- often called white fibres
cartilagr v bone comparison
cartilage is semi rigid and deformable, permeable, avascular, cells nourished by diffusion through the extracellular matrix
bone is rigid, unpermeable, cells within the bone must be nourished by blood vessels that pervade the tissue
cells in cartilage
chondrocytes, chondroblasts when immature
where do chondorcytes live
within a space in extracellular matrix termed lacuna
what is the ECM compsoed of
type 2 collagen and proteoglycans predominantly
types of cartilage
hyaline
fibrocartilage
elastic
what is fibrocartilage rich in
collagen type 1
