Unit 1: Lecture 10 Flashcards
Bony components of the shoulder
- Clavicle
- Scapula
Proximal humerus joins shoulder girdle at…
glenoid fossa
Joints of the shoulder complex (4)
- Glenohumeral joint
- Sternoclavicular joint
- Acromioclavicular joint
- Scapulothoracic joint
Glenohumeral joint ligaments (6)
- Superior/Middle/Inferior glenohumeral ligaments
- Coracohumeral ligament
- Glenoid labrum (SLAP lesion)
- Articular capsule
Sternoclavicular joint ligaments/protection (6)
- Anterior/Posterior sternoclavicular ligament
- Anterior/Posterior interclavicular ligaments
- Articular capsule
- Articular disk
Acromioclavicular joint ligament (3)
- Acromioclavicular ligament (thickening of articular capsule)
- Coracoacromial ligament (forms supraspinatus tunnel)
- Coracoclavicular ligament
Acromioclavicular separation is more commonly referred to as a…
shoulder separation
Scapulohumeral rhythm
2/3::1/3 abduction movement for glenohumeral joint movement compared to scapulothoracic joint movement
“Winged scapula?”
Potential damage to long thoracic nerve, which innervates the serratus anterior, which helps in affixing the scapula to the thoracic wall
Rotator cuff muscles and attachments (4)
- Subscapularis - lesser tubercle
- Supraspinatus - greater tubercle (superior facet)
- Infraspinatus - greater tubercle (middle facet)
- Teres Minor - greater tubercle (inferior facet)
Motions muscles of rotator cuff help with:
Medial rotation: subscapularis
Lateral rotation: infraspinatus and teres minor
Initiates abduction: supraspinatus
Pectoralis major is a large muscle which covers the upper chest _________ and contributes to the anterior ____________
Anteriorly; axillary fold
Pectoralis Major arises from…
side of sternum, shaft of clavicle, and cartilages of first 7 ribs, with fibers attaching to LATERAL lip of intertubercular groove of humerus
Pectoralis major actions
G/H medial rotator and adductor
Pectoralis minor arises from…
3rd, 4th, and 5th ribs to coracoid process of scapula.
Primary function of pectorals minor (and clinical aspect)
stabilization of shoulder girdle, but also assists lower trapezius
crutch walkers may use the pec minor as they lift the trunk against a stationary shoulder girdle base during ambulation
Subclavius connects…
first rib and clavicle
Subclavius primary function
stabilization of clavicle, but also depresses and protracts clavicle
Bursae
sac-like structures containing fluid
found at points of friction (where a tendon inserts into bone)
Example of bursa? (and 5 facts about it)
Subacromial bursa/subdeltoid bursa
- size of half dollar
- located deep to deltoid
- overlying tendon of supraspinatus and joint capsule
- has an extension which courses beneath the acromion and coracoacromial ligament
The subacromial/subdeltoid bursa facilitates movement of the deltoid over the joint capsule and supraspinatus tendon
Supraspinatus tendinitis
Subacromial/subdeltoid bursa may become irritated and ultimately fuse to supraspinatus tendon and joint capsule.
Also would lead to “bursitis,” or “shoulder pain”
Axilla superior markings (3)
- 1st rib
- scapula
- clavicle
Axilla boundaries (base, anterior, posterior, medial, lateral, and apex)
Base - armpit (formed and supported by axillary fascia)
Anterior - anterior axillary fold (pec major)
Posterior - poster axillary fold (lat. dorsi and teres major)
Medial - serratus anterior
Lateral - floor of intertubercular groove of humerus
Apex - triangle formed by 1st rib, scapula, and clavicle
Axillary fascia
from latissimus dorsi to the pectorals major and makes hollow of armpit
