Skeletal System Flashcards
functions of the skeletal system
support and protection, body movement, excretion
axial skeleton
to protect the central nervous system
how many bones are in the axial skeleton?
80 bones
skull, vertebrae, rib cage,
appendicular skeleton
bones that support appendages
how many bones are in the appendicular skeleton?
126
arms, femur, fibula, tibia, feet bones
how many total bones are in the body?
206
what are the 5 types of bones
long, short, flat, irregular, and sesamoid
long bones
cylinder-shaped bones that are longer than they are wide, gives leverage.
tibia, fibula, femur, metatarsals, and phalanges
short bones
shaped more like a cube
carpal, tarsals
flat bones
the spongy bone between two layers of compact bone
irregular bones
cancellous tissue enclosed in compact bone
vertebræ, sacrum, coccyx, temporal, sphenoid, ethmoid, zygomatic, maxilla, mandible, palatine, inferior nasal concha, and hyoid.
sesamoid bones
a small round bone that is imbedded within a tendon, whose purpose is to reinforce and decrease stress on that tendon
knee, thumb, big toe
epiphysis
end
diaphysis
shaft
articular cartilage
hyaline cartilage
periosteum
vascular connective tissue enveloping the bones except at the surfaces of the joints.
medullary cavity
hollow chamber filled with bone marrow
red marrow
blood
yellow marrow
fat
compact
wall of diaphysis
spongy
epiphysis- red marrow
pivot
Uniaxial joints allows rotational movement
freely movable
hinge
Uniaxial joint, allows flexion and extension, synovial joint that allows motion in one plane.
condyloid
biaxial joint, allows flexion and extension, abduction/ adduction and circumduction
saddle
biaxial joint, allows flexion/ extension, abduction/ adduction and circumduction
plane
the multiaxial joint allows inversion and eversion of foor. extension and lateral flexion of the vertebral column
ball and socket
multiaxial joint, allows flexion/ extension
Flexion/ Extension
take place in sagittal plane, involve anterior or posterior movements of the body.
flexion is decreasing the angle and extension is increasing the angle.
adduction, abduction, circumduction
condyloid, saddle, and ball and socket joints
adduction is arms by your side
abduction is arms raised laterally
circumduction is moving arms in a circle
rotation
can occur in the vertebral column
medial/ lateral
medial (internal rotation) movement that brings anterior surface of limb towards the midling of the body. Lateral is away from the midline
Supination/ Pronation
Pronation- palms down, supination- palms up
dorsiflexion/plantar flexion
dorsiflexion- foot flexing up, plantarflexion- foot down
opposition/ reposition
opposition- thumb touching index and 3 fingers normal, reposition- regular position
inversion/ eversion
inversion- turning foot where bottom of foot is towards the midline, eversion- turning bottom of foot away from the midline.
protraction
sticking the jaw out
depression/ elevation
elevation- raising shoulders, depression- putting shoulders down
how many bones are in the cranium?
22
what is the only movable bone in the skull?
mandible, jaw
what are the 5 vertebral regions
superior to an inferior order cervical vertebrae thoracic curve intervertebral disc lumbar vertebrae sacrum coccyx
how many vertebrae are in the cervical?
7 (C1-C7)
how many vertebrae in thoracic?
12 (T1-T12)
How many vertebrae in lumbar?
5 (L1-L5)
Scoliosis
is an abnormal, lateral curvature, accompanied by twisting of the vertebral column
Kyphosis
curvature of the spine greater than 50 degrees
Lordosis
exaggerated inward curve of the spine that affects the lower back
What does the thoracic cage protect?
The heart, lungs and other organs
Costal Cartilage
bars of hyaline cartliage to prolong the ribs.
Three types of ribs and how many of each?
true, false and floating ribs.
Main bones of the pectoral girdle
Clavicle and Scapula
humerus
arm bone between shoulder and elbow
Radius
Bone on the thumb side of forearm
Ulna
The other bone that makes up the arm
Carpals
Bones that make up the base of the wrist
Metacarpals
Hand bones
Phalanges
fingers
Femur
big thigh bone
Tibia
Big lower leg bone
Fibula
Other small lower leg bone
Tarsals
at base of ankles
Metatarsals
toe bones
Closed Fracture
Fracture where the bone is pointed in the correct direction
Open Fracture
Fracture where bone is pointed in the incorrect direction
Transverse Fracture
Fracture where the bone is still together
Spiral Fracture
A fracture like a spiral
Comminuted Fracture
Multiple small fragments of bone
Impacted Fracture
Fracture from impact
Greenstick Fracture
Chip out of the bone
Oblique Fracture
Clean cut fracture