The humerus
is a long bone
in the arm
that runs
from the
shoulder to
the elbow.
It connects the scapula
and the radius
Body of humerus cylindrical in its
upper portion, and
more prismatic
below.
Lower extremity
of humerus consisting of a
faceted condyle
that articulates
with the radius.
Upper extremity of
humerus - consisting
of a rounded head, a
narrow neck, and
two short processes,
or "tuberosities".
Distally, the capitulum of
the humerus articulates
with the head of the
radius, and the trochlea
of the humerus
articulates with the
olecranon process of the
ulna.
The grooved surface
at the lower end
articulating with the
trochlear notch of
the ulna.
Above the back of the
trochlea is a deep
triangular depression,
the olecranon fossa, in
which the summit of
the olecranon is
received in extension
of the forearm.
A bony prominence of the
outer aspect is the lateral
epicondyle that provides
origin for the muscles
which dorsiflex the wrist.
Inflammation at this site is
known as tennis elbow.
medial epicondyle is larger
and more prominent than the
lateral epicondyle that gives
attachment to the ulnar
collateral ligament of the
elbow-joint and ulnar nerve
runs in a groove on the back
of this epicondyle.
Above the front
part of the
trochlea is a small
depression, the
coronoid fossa,
which receives the
coronoid process
of the ulna during
flexion of the
forearm.
The radius is the bone of
the forearm that extends
from the lateral side of
the elbow to the thumb
side of the wrist. The
radius is situated on the
lateral side of the ulna, It
is a long bone, prismshaped and slightly
curved. The radius
articulates with the
capitulum of the
humerus.
Radius connects the
elbow to the forearm.
Head of Radius, disk shaped
prominence at proximal end of
bone, forms articulating surface
with capitulum of humerus.
Radial tuberosity is a round
projection that serves as an
attachment point for Biceps
Brachii muscle.
Ulnar notch of Radius, slide
depression that articulates with
Ulna.
Styloid process of Radius is the
lateral projection at distal end of
bone that forms lateral portion
of wrist joint.
The ulna is a long
bone, prismatic in
form, placed at the
medial side of the
forearm, parallel with
the radius. It is divisible
into a body and two
extremities, it forms a
large part of the
elbow-joint; the bone
diminishes in size from
above downward.
Ulnar Tuberosity round
distal end of coronoid
process, serves as an
attachment point for
Brachialis muscle.
Styloid process of ulna is
small, medial projection
from head region, forms
medial portion of wrist joint.
The radial notch of the
ulna is a narrow, oblong,
articular depression on the
lateral side of the coronoid
process; it receives the
circumferential articular
surface of the head of the
radius
Olecranon process of
Ulna large, fan shaped
projection from
proximal end of
trochlear notch, forms
elbow.
Trochlear notch of Ulna
large depression at
proximal end of bone,
area of articulation with
trochlea of humerus.
Coronoid process of
Ulna – anterior
projection from
trochlear notch.
There are 15 bones
that form
connections from
the end of the
forearm to the
hand. The wrist
itself contains eight
small bones, called
carpal bones. These
bones are grouped
in two rows across
the wrist.
The proximal row
is where the wrist
creases when you
bend it. Beginning
with the thumbside of the wrist,
the proximal row
of carpal bones is
made up of the
scaphoid, lunate,
and triquetrum.
The second row of
carpal bones,
called the distal
row, meets the
proximal row a
little further
toward the fingers.
The distal row is
made up of the
trapezium,
trapezoid,
capitate, hamate,
and pisiform
bones.
The wrist is so
complicated because
every small carpal bone
forms a joint with the
bone next to it. The
wrist joint is actually
made up of many small
joints.
The proximal row of
carpal bones connects
the two bones of the
forearm, the radius and
the ulna, to the bones
of the hand.
The bones of the
hand are called the
metacarpal bones.
These are the long
bones that lie
within the palm of
the hand. The
metacarpals attach
to the phalanges,
which are the
bones in the
fingers and thumb.