your

ANATOMY OF THE CLAVICLE (COLLARBONE)

the two clavicles also called your

collar bones

are long bones found between your

sternum and scapulae

they are found just above the first rib

and help hold the scapula in place

this lets the arm hang freely away from

the thorax and have a larger range of

movement

the clavicle and scapula together make

up the shoulder girdle

also called the pectoral girdle the

clavicle forms the anterior portion of

the shoulder girdle

which serves to connect the arms to each

side the shoulder girdle also transmits

physical impacts from the upper limb to

the axial skeleton

which includes bones of the head and

trunk at its medial end

the clavicle articulates with the

manubrium of the sternum at the

sternoclavicular joint

at its lateral end the clavicle

articulates with the acromion of the

scapula at the acromioclavicular joint

the two ends of the clavicle are easily

distinguished the medial end is rounded

or prismatic

and the lateral end is flattened the

inferior

surface of the lateral end is rough and

has a ridge called the trapezoid line

also called the oblique or trapezoid

ridge which attaches to the trapezoid

ligament

medial to the trapezoid ridge is a

slight rounded projection called the

conoid tubercle

also called the coracoid tuberosity

which is over top the coracoid process

of the scapula

note that the coracoclavicular ligament

which connects the clavicle to the

coracoid process

is made up of two fasciculi the

trapezoid ligament

and the conoid ligament the clavicle can

be divided into three parts

the medial or sternal end the shaft and

the lateral or acromial end

the medial end articulates with the

clavicular notch of the manubrium of the

sternum

forming the sternoclavicular joint the

shaft can be divided into the medial

two-thirds

which is thicker and a lateral one-third

the lateral third has two borders and

two surfaces

the borders are the concave thin rough

anterior border

and the convex rough thicker posterior

border

the surfaces are upper and lower