The Pectoral Girdle Flashcards
What are the components of the pectoral girdle?
4 components
- clavicle
- scapula
- axilla (armpit)
- pectus. (Upper chest)
What are the functions of the Pectoral Girdle
3 functions
- movement of the upper limb
- support and structure of the shoulder
- attachment of the upper limb to the axial skeleton
draw/ label key structures on the clavicle
- sternal end
- sternal facet (joint between sternum and clavicle)
- shaft and sub-clavicle groove
- conoid tubercle
- trapezoid line
- acromial facet (joins to shoulder forming the acromioclavicular joint)
The Scapula
what are the three fossae found on the clavicle
- supraspinous fossa
- infraspinous fossa
- subscapular fossa
Draw/label the components of the scapula
- acromion
- coracoid process
- glenoid cavity/ fossa
- lateral border
- superior border
- inferior angle
- medial border
- subscapular fossa
- suprascapular notch
- superior angle
- posterior view
- anterior view
- spine
- infraspinous fossa
- infra-glenoid tubercle
- lateral angle
- supraspinous fossa
what are the ligaments associated with the pectoral girdle and where are they located
coracoacromial ligament
- found joining the coracoid process and acromion
coracoclavicular ligament
- made up of 2 parts:
conoid and trapezoid part
conoid origin = conoid tubercle (clavicle)
conoid attachment = the coracoid process
trapezoid origin = trapezoid line (clavicle)
trapezoid attachment = coracoid process
What are the joints associated with the pectoral girdle?
What type of joint are they and what movements do they allow
sternoclavicular
- saddle joint
- connects clavicle to sternum
- biaxial movement (movement along 2 planes)
acromioclavicular joint
- joins the acromial end of the clavicle to the acromion of the scapula
- plane/gliding joint
- find out what type of movement it allows
What are come common pectoral girdle injuries
- ruptured ligaments
- AC joint dislocation
- clavicle fractures (usually in mid area)
- impingement syndrome
What is impingement syndrome
When the outer edge of the shoulder blade pinches the rotator cuff beneath
The space between the acromion and rotator cuff become smaller when lifting the arm causing them to rub, resulting in irritation
what are the main movements involved with the scapula
- protraction
- retraction
- elevation
- depression
- medial and lateral rotation
outline what these movements mean
- protraction
- retraction
- elevation
- depression
- medial and lateral rotation
- protraction = rolling body part forward parallel to the ground
- retraction = rolling body part backwards parallel to the ground
- elevation = movement in a superior direction
- depression = movement in an inferior direction
- medial rotation = rotational movement towards the midline
- lateral rotation = rotational movement away from the midline
what muscles are involved in the Pectoral Girdle
Draw/label a diagram
- trapezius
- rhomboid
- levator scapulae
- pectoralis minor
- serratus anterior
state the origin of the muscles in the pectoral girdle
Trapezius - base of the skull and spinous processes of the cervical and thoracic vertebrae
rhomboid - spineous process of the C7 and T5
