Muscles Of The Shoulder Girdle Flashcards
Learn the attachments, actions, and innervation of the muscles of the shoulder girdle
Pec minor attachments
Superior anterior aspects of ribs 3-5
Medial superior coracoid process
Pec minor actions
Depression Protraction Downward rotation Stabilizes scap Inspiration
Pec minor innervation
C8-T1
Pec major functions
Clavicular
- flexion of GH
Sternocostal
- extension of GH from high flexion
Horizontal adduction
Medial rotation
Depress shoulder girdle
Pec major attachments
Border of the sternum at clavicular notch to distal body
Inferior clavicle
Ribs 1-6 and costal cartilage
Aponeurosis of external oblique
Lateral lip of bicipital groove
Pec major innervation
C5-T1
Subclavius function
Depression of clavicle
Stabilize SC
Protects clavicle and first rib
Subclavius attachments
Groove for subclavius
Superior aspect of first rib and costal cartilage
Subclavian innervation
Nerve to subclavius
C5-6
Serratus anterior functions
Protraction Upward rotation Stabilizes scap Elevation Depression
Forms medial wall of axilla
Serratus anterior attachments
Superior external surface of ribs 1-8
Anterior aspects of medial border of the scap
Serratus anterior innervation
Long thoracic nerve
C5-7
Trapezius functions
Upper fibres: scapular - upward rotation - elevation Upper fibres C-spine: - side flexion - rotation - extension
Middle fibres:
- retraction
Lower fibres:
- downward rotation
- depression
Trapezius attachments
Upper fibres origins:
- External occipital protuberance
- nuchal ligament
- mid 1/3 nuchal line
- SP of C7
Middle fibres origin:
- SPs and supraspinous ligaments of T1-5
Lower fibres origin:
- SPs and supraspinous ligaments of T6-12
Insertion:
- posterior lateral 1/3 of clavicle
- anteromedial acromion process
- superior lip of spine of scap
- inferior lip of spine of scap
Trapezius innervation
Accessory nerve (C XI)
Latissimus dorsi fx
Scapula
- depression
- downward rotation
GH
- adduction
- extension
- internal rotation
Anterior rotation of pelvis
Latissimus dorsi attachments
Origins
- SPs of T7-L5
- Interspinous ligs of T7-L5
- thoracolumbar fascia
- posterior aspect ribs 9-12
- post 1/3 external lip of iliac crest
Insertions
- inferior angle of scapula
- medial lip of bicipital groove
Lat dorsi innervation
Thoracodorsal nerve C6-8
Levator scapula fx
Scapula
- elevation
- downward rotation
C-spine
- lateral flexion
- rotation
- extension
Levator scap attachments
posterior tubercles of transverse processes of c1-4
- superior angle of scap
- sup aspect of medial border of scap
Levator scap innervation
Dorsal scapular nerve C4/5
Rhomboid major fx
- Scapular retraction
- elevation
- downward rotation
Rhomboid major attachments
Origins
-SPs and supraspinous ligs of T2-5
Insertion
- medial border of scap, root of spine to inferior angle
Rhomboid major innervation
Dorsal scapular nerve C4/5
Rhomboid Minor fx
- Scapular elevation
- retraction
- downward rotation
Rhomboid minor attachments
- Lower ligamentum nuchae
- SPs C7/T1
- medial border at foot of spine of scap
Rhomboid minor innervation
Dorsal scapular nerve C4/5
Deltoid fx
GH
- abduction
- extension
- external rotation
- flexion
- internal rotation
Deltoid attachments
Origins
- anterior border of lateral third of clavicle
- lateral aspect of acromion
- inf lip of spine of scapula
Insertion
- deltoid tuberosity
Deltoid innervation
Axillary nerve C5/6
Supraspinatus fx
GH abduction (0-30 degrees) GH stabilization
Supraspinatus attachments
Supraspinous fossa and deep fascia
Superior aspect of greater tubercle
Suprapsinatus innervation
Suprascapular nerve C4-6
Infraspinatus fx
- External rotation
- adduction
- extension
- GH stabilization
Infraspinatus attachments
- medial 2/3 of infraspinous fossa
- deep fascia
- posterior middle aspect of greater tubercle
- deep fascia
Infrapinatus innervation
Suprascapular nerve C4-6
Subscapularis fx
- internal rotation
- adduction
- GH stabilization
Subscapularis attachments
- medial 2/3 of subscapular fossa
- anterior aspect lesser tubercle of humerus
Subscapularis innervation
Upper and lower subscapular nerve C5-7
Teres minor fx
- External rotation
- extension
- adduction
- GH stabilization
Teres minor attachments
- posterior aspect of superior 2/3 of lateral border of scap
- posterior inferior aspect of greater tubercle
Teres minor innervation
Axillary nerve C5/6
Teres major fx
Lats little helper
- extension
- internal rotation
- adduction
- forms posterior wall of axilla
Teres major attachments
- inferior posterior third of lateral border of scap
- anterior crest of lesser tubercle of humerus
Teres major innervation
Lower subscapular C5-7
Triceps brachii fx
GH
- extension
- adduction
Elbow
- extension
Triceps brachii attachments
- Medial head: inferior medial to radial groove
- lateral head: superior lateral to radial groove
- long head: infraglenoid tubercle
- posterior aspect of olecranon process
Triceps brachii innervation
Radial nerve C6-T1
Coracobrachialis fx
- GH flexion
- Adduction
Coracobrachialis attachments
- apex of coracoid process of scap
- medial surface of mid humeral shaft (opposite from deltoid tuberosity)
Coracobrachialis innervation
Musculocutaneous nerve C5-7
Biceps brachii fx
- gh flexion
- elbow flexion
- supination
Biceps brachii attachments
Long head: supraglenoid tubercle
Short head: apex of coracoid process
- radial tuberosity and bicipital aponeurosis
Biceps brachii innervation
Musculocutaneous C5/6
