Pectoral Girdle, Scapular Movements and Muscles Flashcards
Identify the structures labelled 1-4
1- Sternoclavicular joint
2- Clavicle
3- Acromioclavicular joint
4- Scapula
At what joint do the entire upper limb and the pectoral girdle articulate?
Glenohumeral joint
Identify the parts of the clavicle labelled 1-3
1- Acromial end
2- Coroid tubercle
3- Sternal end
What is the weakest part of the clavicle?
The junction between the lateral and middle thirds of the clavicle
What is the function of the conoid tubercle?
Attachment point for the conoid ligament which binds the clavicle to the coracoid process of the scapula
Identify structures labelled 1-19
1-Supraspinous fossa
2- Superior angle
3- Spine of scapula
4-Acromion
5-Medial border
6-Infraspinous fossa
7-Inferior angle
8-Lateral border
9-Acromion
10- Coracoid process
11- Glenoid cavity
12- Lateral border
13- Superior angle
14- Medial border
15- Subscapular fossa
16- Inferior angle
17- Supraglenoid tubercle
18- Glenoid cavity
19- Infraglenoid tubercle
What types of joints are the acromioclavicular and sternoclavicular joints?
Both synovial
AC- Plane
SC- Saddle
At what joints does abduction of the arm occur?
From the anatomical position, initially all movements will be at the shoulder joint. Beyong 30 degrees, for every 3 degrees of abduction 2 degrees occurs at the shoulder joint and 1 degree at the scapula-thoracic joint
What is the scapulothoracic joint?
The movement of the scapula on the thoracic wall
Not a true anatomical joint, no joint surfaces or structures are present
What muscles are responsible for elevation of the scapula?
Descending trapezius
Rhomboids
Levator scapulae
What muscles are responsible for depression of the scapula?
Pectoralis minor
Ascending trapezius
Serratus anterior
What muscles are responsible for protraction of the scapula?
Serratus anterior
Pectoralis minor
What muscles are responsible for retraction of the scapula?
Trapezius (middle fibres)
Rhomboids
What muscles are responsible for lateral rotation of the scapula, elevating the glenoid cavity?
Trapezius
Serratus anterior
What muscles are responsible for medial rotation of the scapula, depressing the glenoid cavity?
Levator scapulae
Rhomboids
Pectoralis minor
Also gravity