Appendicular Skeleton
- The appendages of the axial skeleton
- found in the limbs
- function for support and movement
- composed of 126 bones
=limbs (appendages)
=Pectoral Girdle
=Pelvic Girdle
*Pectoral and Pelvic Girdle attach the limbs to the
axial skeleton
Pectoral (Shoulder Girdle)
-consist of 2 bones that attach the upper limb to the
axial skeletal
=Scapula
=Clavicle
Pectoral Girdle
- Light, poorly reinforced girdle
- Allows the upper limb a great deal of
freedom
= due to the shoulder girdle attaches to the
axial skeleton to only 1 point (the
Sternoclavicular joint)
= the lose attachment of the scapula
allows it to slide back and forth against the
thorax as the muscles act
= the glenoid cavity is shallow, and the
shoulder joint is poorly reinforced by
ligaments however the exceptional
flexibility causes dislocation
-The paired clavicles aka collar bones are slender
dovely curved bones
- each clavicle attaches itself to the manubrium of
the sternum and to the scapula laterally
- the connection of the clavicle and the scapula
forms the shoulder joint
-clavicles acts as the braces to hold the arm away
from the top of the thorax and prevents shoulder
dislocation
Clavicle
-Sternal end is the one attached to the manubrium
of the sternum
-Acromial attached to the acromion of the scapula
-Acromion part of the scapula that forms the
highest point of the shoulders
- the attachment of Acromial and Acromion makes
the Acromioclavicular joint (AC joint)
Scapula
-Scapula aka wings they tend flare when we move
our arms posteriorly
- it not directly attached to the axial skeleton; they
are loosely held in place by the trunk muscles
- 3 Borders
=superior
=Medial
=Lateral
-3 Angles
= superior
=Lateral
= Inferior
-Glenoid cavity is a shallow socket that receives
the head of the arm bone
-Scapula contains 2 important process
= Coracoid Process โ at the top the
shoulder that anchor some muscles of the arm
