Chapter 5 Skeletal System Reverse Flashcards
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bones
joints
cartilages
ligaments
Skeletal system
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Axial skeleton
appendicular skeleton
skeletal subdivisions
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206
bone in an adult
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support the body protect soft organs allow movement due to attached muscle store minerals and fats blood cell formation
function of bones
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compact bone outside osteon spongy bone-inside
bone tissue
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Long bones
short bones
flat bones
irregular bones
classification of bone shape
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typically longer than wide expanded end femur, humerus
long bones
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generally cube shaped carpals and tarsals
short bones
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thin flattened and usually curved skull, ribs and sternum
flat bones
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irregular shape do not fit other classification categories vertebrae, hip bones
irregular bones
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Diaphysis
epiphysis
periosteum
perforating fibers
articular cartilage
epiphyseal plate e
piphyseal line
medujllary cavity
long bone structure
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shaft wall thick layer of compact bone covering spngy bone
diaphysis
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expanded joints forms joints spngy bone covered by compact bone
epiphysis
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outside covering of the diaphysis blood vessels just underneath fibrous connective tissue membrane
periosteum
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secure periosteum to the underlying bone
perforating fibers
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covers external surface of epiphysis located on articulated surface made of hyaline cartilage decreases friction at joint surfaces
articular cartilage
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flat plate of hyaline cartilage seen in young growing bone
epipyseal plate
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remnant of epiphyseal plate seen in adult bones
epiphyseal line
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cavity inside diaphysis lined by endosteum contains yellow marrow in adults contains red marrow in infants highly vascular
medullary cavity
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osteon central canal lamellae lacunae nutrient foramen perforating canal canaliculi
microscopic anatomy of bone
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funtional unit of compact bone containing central canal and matrix rings
osteon
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opening in the center of an osteon carries blood vessels and nerves
central canal
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rings around the central canal
lamellae
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cavities containing osteocytes between lamellae
lacunae
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on surface of bone where blood vessels enter and leave
nutrient foramen
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canal perpendicular to the central canal carries blood vessels and nerves
perforating canal
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tiny canals radiate from central canal to lacunae form transparent system connecting all bone cells to nutrient supply
canaliculi
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ossification intramembranous ossification endochondral ossification bone growth appositional growth
Bone formation
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bone formation calicification of bone
ossification
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begins as fibrous sheet produces flat bones
intramembranous ossification
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bone develops from hyaline cartilage model six weeks fetal development to early 20s most bones develop this way
endochondral ossification
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epiphyseal plates allow for longitudinal growth of long bones during childhood new cartilage is continuously formed older cartilage becomes ossified epiphyseal plate ossifys then growth stops
bone growth
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process by which bones grow in diameter
appositional growth
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process of reabsorption and depostion that occurs throughout life 3-5percent annually
bone remodeling
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blood calcium level pull of gravity and muscles on the skeleton
remodeling factors
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osteoclasts secure substances that break down calcified extracellular matrix Acids dissolve inorganic components Lysosomal enzymes digest organic components Osteoblasts secrete new bone
cells involved in remodeling
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osteocyte mature bone cells osteoblast bone forming cells osteoclasts bone destroying cells
types of bone cells
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forms longitudinal axis of the body support head neck and trunk 3 parts
Axial skeleton
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Skull and hyoid vertebral column ribs and sternum
parts of axial skeleton
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two sets of bones cranial and facial bones are joined by sutures only mandible is attached f=reely moving
Skull
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maxilla palatine
bones of hard palate
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ethmoid vomer
bones of nasal septum
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hollow portions of bones surrounding the nasal cavity frontal maxillary ethmoid sphenoid
paranasal sinuses
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lighten the skull give resonance and amplification to voice
functions of paranasal sinuses
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only bone that does not articulate with any other bone serves as a movable base for tongue aids is swallowing and speech
hyoid bone
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large compared to infants body frontanels fibrous membranes connecting the cranial bones allow bone to grow convert to bone within 24 months
fetal skull
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24 bones separated by discs 7 cervical 12 thoracic 5 lumbar 5 sacrum fused 4 coccyx fused
vertebral column
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primary are spinacurvatures of the thoracic and sacralsecondary are spinal curvatures of cervical and lumbar
spine curvature
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present from birth convex posteriorly
primary spinal curve
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develope after birth convex anteriorly
secondary spinal curve
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scoliosis abnormal lateral curve kyphosis exaggerated thoracic curve lordosis abnormal anterior convexity of lumbar
spinal curvature disorders
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body anterior weight bearing portion foramen canal which spinal cord passes spinous process
Vertebrae
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Atlas C1 Axis C2 transverse foramen 2 holes spinous points down
cervical vertebrae
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long pointed spinous process large body horseshoe shaped articulate with ribs giraffe
thoracic vertebrae
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large rounder bodies supports body weight no facet for rib lumbering moose
lumbar vertebrae
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formed by fusion of 5 vertebrae
sacrum
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formed by fusion of 4 vertebrae tailbone
coccyx
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child 33 adult 26
total number of vertebrae
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forms a cage to protect major organs sternum ribs thoracic vertebrae
bony thorax
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true ribs 1-7 false ribs 8-12 floating ribs 11-12
ribs
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126 bones limbs pectoral girdle pelvic girdle
appendicular skeleton
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clavicle collarbone scapula shoulder blade
pectoral girdle shoulder
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elongated s shaped bones forms joint with sternum only joint that attaches upper limb to axial skeleton
clavicle
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flat triangular bone articulates with clavicle and humerus
scapula
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humerus brachium extends from scapula to elbow antebrachium 2 bones ulna medial bone radius lateral bone
bones of upper limbs
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8 carpals wrist bones 5 metacarpals palm 14 phalanges fingers
Manus hand
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2 coxal bones ossa coxae composed of 3 fused bones illium ischium pubis protects several organs, reproductive, urinary and part of large intestine
Pelvic girdle
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Femur heaviest and strongest in body crural region 2 bones tibia shinbone larger and medial fibula lateral to tibia thins and sticklike, non weight bearing
Lower limbs
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7 tarsals largest talus calcaneus heelbone 5 metatarsals top 14 phalanges toes
Foot bones
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articulation holds bones together allows for mobility
joint
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functionally structurally
joint classifications
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synarthoses immovable joints amphiarthoses slightly movable joints diarthoses freely movable joints
Funtional joints
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fibrous joints cartilaginous joints synovial joints
structural joints
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generally immovable articulating bones held together by fibrous tissue no joint cavity
fibrous jointts
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immovable or slightly movable bones connected by cartilage no cavity
cartilaginous joint
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freely movable joint articulating bones separated by cavity most complex most joints in body
synovial joint
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hyaline cartilage covers ends of bones fibrous capsule encloses joint surface dense connective tissue joint cavity is fill with synovial fluid lubricates articulating surfaces
synovial joint features
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structures associated with synovial joint
ligaments
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flattened fibrous sac filled with synovial fluid not part of joint reduces friction between muscles and bone, tendon and bone
bursae
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elongated bursa that wraps around a tendon
tendon sheath
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fibro cartilage pads shock absorbers limit lateral movement
menisci of knee
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cruciate ligaments limit anterior-posterior movement of knee ligamentum capitus of hip
ligaments
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plane joint hinge joint pivot joint condyloid joint saddle joint ball and socket joint
types of synovial joints
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articulating surfaces nearly flat between carpal and tarsal bones
Plane joint
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convex surface fits into a concave surface elbow, knee interphalangeal
hinge joint
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cylyndrical surface rotates with a ring of bone atlas and axis vertebrae proximal radius and ulna
pivot joint
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ovoid condyloe fitting into and elliptical cavity between metacarpal and phalanges
condyloid joint
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articulating surfaces have both concave and convex areas carpal bones and 1st metacarpal
saddle joint
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bone with globular or egg shaped head articulating with the cup cavity of another bone hip and shoulder
ball and socket joint
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Osteon
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Lamellae
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Collagen Fiber
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periosteum
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spongy bone
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perforating canal
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central canal
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lacuna
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osteocyte
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canaliculi