Histology Flashcards
what is the sarcolemma
muscle cells cell membrane
what is a fascicle
group of muscle fibres, muscle contains several of them
what is the epimysium
connective tissue surrounding entire muscle
what is the perimysium
connective tissue surrounding the fascicle
what is the endomysium
connective tissue covering one muscle fibre
what is a motor unit
one motor neuron and all muscle fibres it supplies
branches at muscle fibre NMJ
characteristics of type I muscle fibre
slow to contract
oxidative metabolism
fatigue resistant
characteristics of type II muscle fibre
fast contracting but still resistant to fatigue by oxidative metabolism
characteristics of IIB muscle fibre
anaerobic metabolism
fatigue easy but produce greater force
characteristics of cartilage
semi rigid
deformable
avascular
nutrition by diffusion through ECM
where are chondrocytes found and what do they do
lacuna in ECM
maintain ECM and have secretory function
most of cartilage ECM made up of?
water
besides water, what else is found in cartilage
proteoglycans
type II collagen
types of cartilage
hyaline
elastic
fibrocartilage
characteristics of bone
rigid
non-permeable
function of bone
support lever for movement organ protection calcium storage haemopoiesis
what is the diaphysis and what is it made up of
shaft of bone
cortical
what is the epiphisis and what is it made up of
cancellous/trabecular bone
head of bone
what is a haversian canal and where is it found
canal in cortical bone containing an osteocyte
what is an osteoprogenitor cell
cell found on bone surface, reserve osteoblast
what is an osteoblast
bone forming, secretes collagen, osteoid and proteoglycan that becomes mineralised
what is an osteocyte
osteoblast trapped in bone matrix
what is an osteoclast
cell responsible for bone resorption
describe the process of remodelling
osteoclasts drill into bone and form tunnel
vessels grow with drilled hole and osteoblasts lay down new lamellar one
continues until haversian canal formed
what is woven bone
collagen fibres deposited in haphazard way following heal from break
not as strong as lamellar bone and remodelled subsequently
