Transcript C. Upper Extremities - Crestwood Local Schools

C. Upper Extremities
1. Consists of 60 bones
a. Includes humerus, ulna, radius,
carpals, metacarpals, and
phalanges
2. Humerus- (arm bone) longest and
largest bone in the upper extremities
a. Proximal end is a head that goes
into the glenoid cavity of the
scapula
1. Head sits on an
anatomical neck
b. Where the bone turns and goes
into the diaphysis is the surgical
neck (commonly broke)
c. Body (shaft) is rounded
proximally and becomes triangular
and flat
d. distally are found two
attachment points
1. Capitulum- attaches to the
radius
2. Olecranon fossa attaches
to the ulna
e. Ulnar nerve (funny bone) is
posterior to the medial epicondyle
3. Ulna bone of the medial aspect of the
forearm
a. Proximal end is the olecranon
which is the elbow
b. Attaches proximally with the
radius at the coranoid process
c. Distal end has a head that is
separated from the wrist by
fibrocartilage
4. Radius- bone of the lateral aspect of
the forearm
a. Articulates proximally by a
head with the capitulum of the
humerus and the radial notch/
coronoid process of the ulna
b. Medially concave with the
ulnar notch distally