week 2 teaching: the upper limb Flashcards
the pectoral girdle
attachment of appendicular skeleton to axial skeleton
only one bone attachment- from clavicle to the sternum
scapula is then attached to clavicle, held in place on posterior side of thorax by muscles
socket joint where humourous joins to scapula is glenoid humoural fossa
why can we produce wide range of movement at shoulder joint
socket of the glenoid fossa is very shallow
allows for throwing overhead motion
very shallow socket of glenoid fossa means
joint is fairly unstable- increases likelhood of joint disslocation
three regions of upper limb
shoulder
arm
forearm
shoulder region
humorous attaches to scapula and pectoral girdle
arm
between shoulder and elbow join
elbow
formed by connection from humourous to ulnar
hinge joint
one degree of freedom
radius forms major joint with
carpal bones
ellipsoid joint
two degrees of freedom
muscles around pectoral girdle
stabilise bones around pg
reduce movement of bones
trapezius- posterior
large superficial muscle
long attachemnt along spine
inserts into triangle shape
levator scapulae, rhomboid minor, rhomboid major- posterior
deep to trapezius
aid in retraction of shoulder- posterior movement of shoulder and PG
serratus anterior- posterior
deep to trapezius
originates on anterior medial border
runs round to attach onto ribs on anterior surface
trapezius- anterior
attaches along clavicle
serratus anterior - anterior
finger like projections
produces protraction- anterior movement of shoulder
pectoralis minor
acts on PG
