The Pectoral Girdle Flashcards
The Pectoral Girdle consists of?
The clavicle and scapula
What joint links the free limb to the axial skeleton?
The sternocalvicular joint
Why are muscles required to stabilise the shoulder joint?
Because as the shoulder joint is extremely mobile, it has sacrificed stability, which needs to be overcome with muscles
How are movements in the pectoral girdle classified?
By the movement of the scapula
Superior rotation
Glenoid points superiorly
Whats another name for the forearm?
‘Anti-brachium’
Clavicle functions?
- To act as a strut to stop muscles attached to the scapula pulling it into the thorax.
- acts as an attachment point for muscles
Where is the weak point of the clavicle?
2/3 medially, 1/3 laterally. Here there is no muscles attached, so force of the free limb is transmitted to this area, making in a common place of breaking
The two roughened areas of the clavicle are, and what is their purpose?
1) Coracoclavicular area
2) Costoclavicular area
This allows for attachments of two ligaments that stabilise the clavicle
What is the purpose of having a mobile scapula?
For the hands. These need to be extremely sensitive and mobile with the environment
What are the borders of the scapula?
Medial, lateral and superior
What processes of the scapula are?
spinous, acromion and coracoid
What are the four fossas of the scapula?
Subscapula, supraspinous, infraspinous and glenoid
There is a groove in the middle of the clavicle, what is this called and what is it for?
Subclavian groove, for the subclavian muscle to run through
What does the clavicle articulate with?
The acromion process of the scapula, and the manubrium of the sternum