Pectoral Girdle Lecture

Scapula Movements

Lateral/upward rotation

Protraction/Retraction

Elevation/Depression

Scapula Articulations

clavicle and humerus

Clavicle Functions

1. Transmits forces from the upper limb to the axial skeleton.

2. Provides attachment for muscles

3. Act as a strut to hold upper limb free from trunk

Most common bone fracture

clavicle

ABCs of Radiographs

Alignment

Bone density

Cartilage spaces

Soft tissues

Sternoclavicular joint

Articulation between the clavicle and the sternum

Sternoclavicular Joint Ligaments

Anterior sternoclavicular ligament

Posterior sternoclavicular ligament

Interclavicular ligament

Costoclavicular ligament

Sternoclavicular injuries

Very rare 1% of all joint dislocations

Acromioclavicular Joint

the joint where the acromion and the clavicle meet

Acromioclavicular joint ligaments

-Superior and Inferior Acromioclavicular

-Coracoclavicular (Conoid & Trapezoid)

Acromioclavicular injuries

Shoulder separation, usually caused from falling on the tip of the shoulder

Glenohumeral joint

The synovial ball-and-socket joint of the shoulder

Glenohumeral joint ligaments

Coracohumeral ligament

Coracoacromial ligament

Transverse Humeral ligament

Coracohumeral ligament

passive support that prevents the humerus from subluxing inferiorly

Coracoacromial ligament

forms a protective arch over the humeral head

Transverse Humeral ligament

Holds biceps tendon in intertubercular sulcus

Glenohumeral joint injuries

Shoulder dislocation, anterior dislocation most common

Suprasternal notch location

T2-T3

Manubriosternal angle location

T4-T5

Xiphoid process location

T9 levels

Platysma

Attached to the clavicle and travels superiorly

Pectoralis major proximal attachment

medial half of clavical

Sternalcostal

Pectoralis major distal attachment

Lateral lip of intertubercular sulcus of humerus

Pectoralis Major actions on Humerus

Clavicular Fibers- Flexion, horizontal adduction

Sternal Fibers- Adduction, horizontal adduction, medial rotation

Pectoralis Major Nerves

medial and lateral pectoral nerves

Pectoralis Minor proximal attachment

Ribs 3-5

Pectoralis Minor distal attachment

coracoid process of scapula

Pectoralis Minor action on scapula

pulls forward, downward on coracoid process or elevates the ribs

Pectoralis Minor nerves

Medial pectoral nerve (C8, T1)

Serratus Anterior proximal attachment

Ribs 1-8

Serratus Anterior distal attachment

medial border of the scapula

Serratus Anterior action on scapula

protraction and upward rotation

Serratus Anterior nerves

Long thoracic nerve (C5, C6, C7)

Subclavius proximal attachment

Junction of 1st rib and its costal cartilage

Subclavius distal attachment

Inferior surface of middle third of clavicle

Subclavius action

depression of clavicle or elevation of the first rib

Subclavius nerve

nerve to subclavius