RIBS Flashcards
what is the ribcage comprised of?
sternum (manubirum, body, xiphoid process)
ribs (1-12)
joints (costovertebral & costotransverse)
true ribs
(vertebrosternal)
ribs 1-7
connect directly to sternum via costal cartilage
false ribs
(vertebrochondral)
ribs 8-10
do not connect directly to sternum (share costal cartilage)
floating ribs
(vertebral)
ribs 11 & 12
not connected to sternum
typical vs. atypical ribs
TYPICAL: 3-9
ATYPICAL: 1, 2, 10, 11, 12
what is between the rib facets?
interarticular crest
what is atypical about rib 1?
-shorter & wider
-one articular facet on head
-scalene tubercle for attachment of anterior scalene
-grooves for subclavian artery & vein
-rough area for attachment of middle scalene
what is atypical about rib 2
-thinner & longer than rib 1
-rough area for attachment of posterior scalene
what is atypical about rib 10?
has only one facet
what is atypical about ribs 11 & 12
has no neck
has only one facet
costal cartilage
-smooth, elastic, resilient CT
-connects ribs to sternum at front of chest
-made of cartilage cells in glycoprotein matrix strengthened by collagen
-contributes to elasticity in walls of thorax allowing chest to expand & retract during breathing
sternum
manubrium
body
xiphoid process
costal notch attachment site for…
RIB 1
clavicular notch attachment site for…
attachment site for clavicle
where is the infrasternal angle
at xiphoid process
costovertebral joint
between rib & vertebral body
costotransverse joint
between rib & TVP
sternocostal joint
between sternum & costal cartilage
costochondral joint
between rib & costal cartilage
COSTOVERTEBRAL JOINT type & movements
synovial, plane, diarthrosis, uniaxial
gliding (elevation & depression of ribs during breathing)
COSTOTRANSVERSE JOINT type & movements
synovial, plane, diarthrosis, uniaxial
gliding (elevation & depression of ribs durin breathing)
STERNOCOSTAL JOINT (1ST RIB) type & movements
cartilaginous, synchondrosis, synarthrosis
no movements
STERNOCOSTAL JOINT (RIBS 2-7) type & movements
synovial, plane, diarthrosis, uniaxial
slight gliding
COSTOCHONDRAL JOINTS type & movements
cartilaginous, synchondrosis, synarthrosis
slight movement
SUBCLAVIUS
O: 1st rib (junction of costal cartilage)
I: middle 1/3 clavicle (inferior surface)
A: assist in stabilization of clavicle, depress clavicle
N: nerve to subclavius
intercostal muscles
external
internal
innermost
function of intercostal muscles
aid in posture & respiration
EXTERNAL INTERCOSTALS
O: lower border of ribs
I: upper border of ribs below
A: elevate ribs in inspiration, supports intercostal spaces in inspiration & expiration
N: intercostal nerves
*fibers travel inferior & medially
INTERNAL INTERCOSTALS
O: inner surfaces of ribs & costal cartilage
I: upper borders adjacent ribs below
A: prevents pushing out / drawing in of intercostal spaces in inspiration & expiration, lowers ribs in forced expiration
N: intercostal nerves
*fibers travel inferior & laterally
INNERMOST INTERCOSTALS
O: lower border of ribs
I: upper border of ribs below
A: elevates ribs
N: intercostal nerves
*fibers travel inferior & laterally
LEVATOR COSTARUM
O: TVP C7-T11
I: ribs 1-12
A: elevation of ribs (inspiration)
N: dorsal rami
3 openings in diaphragm
- inferior vena cava (T8)
- esophagus (T10)
- abdominal aorta (T12)
diaphragm INSPIRATION
muscles contract: diaphragm, external intercostals
enlarge thoracic cavity & elevate ribs -> causes air to rush into lungs
diaphragm EXPIRATION
muscles relax: diaphragm & external intercostals
causes elastic tissue in lungs to spring back & expire aire
