17. Pectoral Girdle and Shoulder Flashcards
Name some important bony features of the scapula (9)
Make sure you can identify them
Coracoid process Acromion Spine Superior angle Inferior angle Glenoid cavity Subscapular fossa Infraspinatus fossa Supraspinatus fossa
Make sure you know the origins and attachments of muscles onto the scapula, humerus and clavicle
Lecture slide 4, 5, 6
Name some important bony features of the humerus (7)
Greater tubercle Lesser tubercle Bicipital groove Surgical neck Anatomical neck Deltoid tuberosity Head
Origin of pec major?
Clavicle
Costal cartilage ribs 1-6
Sternum
Insertion of pec major?
Outer lip of bicipital groove of humerus
Function of pec major?
Flexion and adduction of arm
Medial rotation of humerus
Innervation of pec major?
Medial (C8-T1) and lateral (C5-7) pectoral nerves
Origin of pec minor?
3/4/5th ribs
Insertion of pec minor?
Coracoid process of scapula
Function of pec minor?
Pulls shoulder anterior and inferior
Can also elevate ribs if the shoulder is fixed
Innervation of pec minor?
Medial pectoral nerve (C8, T1)
Origin of serratus anterior?
Outer surface upper 8 ribs
Insertion of serratus anterior?
Medial border of scapula
Function of serratus anterior?
Protraction of scapula
Innervation of serratus anterior?
Long thoracic nerve (C5-C7)
What are the 3 parts of trapezius?
Ascending part
Transverse part
Descending part
Origin of trapezius?
Superior nuchal line
Nuchal ligament
Spinous processes of C7-T12
Insertion of trapezius?
Lateral 1/3rd clavicle
Acromion
Spine of scapula
Function of ascending part of trapezius?
Depress scapula
Function of transverse part of trapezius?
Retracts scapula
Function of descending part of trapezius?
Elevate scapula
Rotate glenoid cavity
Inneration of trapezius?
Spinal accessory nerve - motor
C3, C4 - sensory
Origin of lat dorsi?
Ilium
Thoracolumbar fascia
Spinous process of lower 6 thoracic vertebrae
Insertion of lat dorsi?
Floor of bicipital groove of humerus
Function of lat dorsi?
Extension
Medial rotation
Adduction
of arm
Innervation of lat dorsi?
Thoracodorsal nerve C6-C8
Origin of levator scapulae?
Transverse processes of atlas and axis
3/4th vertebrae
Insertion of levator scapulae?
Medial scapular border between superior angle and medial end of scapular spine
Function of levator scapulae?
Control scapula
Elevate trapezius
Can laterally flex neck if the shoulder is fixed
Innervation of levator scapulae?
Direct C3-C5 via dorsal scapular nerve
Origin of rhomboid major?
2-5 thoracic spines
Insertion rhomboid major?
Medial border of scapula, right from spine to inferior angle
Function of rhomboid major?
Retraction of scapula
Innervation of rhomboid major?
Dorsal scapular nerve C4-C5
Origin of rhomboid minor?
Nuchal ligament
C7
Insertion of rhomboid minor?
T1 thoracic spines
Medial end of spine of scapula
Function of rhomboid minor?
Retraction of scapula
Innervation of rhomboid minor?
Dorsal scapular nerve C4-C5
Origin of deltoid?
Lateral 1/3rd clavicle
Acromion
Spine of scapula
Insertion of deltoid?
Deltoid tuberosity of humerus
Function of deltoid?
Middle - arm abduction (from 10-110 degrees)
Posterior - extension and lateral rotation
Anterior - flexion and medial rotation
Innervation of deltoid?
Axillary nerve C5,C6
Origin of teres major?
Lateral border of scapula
Insertion of teres major?
Medial lip of bicipital groove of humerus
Function of teres major?
Adduction and medial rotation of the arm
Innervation of teres major?
Subscapular nerve C5-C6
Origin of subclavius?
Sternal end of 1st rib
Insertation of subclavius?
Middle 1/3rd of underside of clavicle
Function of subclavius?
Draws down and forwards during abduction
Innervation of subclavius?
Nerve to subclavius C5, C6
Name the rotator cuff muscles
Subscapularis
Teres minor
Supraspinatus
Infraspinatus
Origin of subscapularis?
Subscapular fossa
Insertion of subscapularis?
Lesser tubercle of humerus
Function of subscapularis?
Medially rotate arm
Innervation of subscapularis?
Upper and lower subscapular nerves C5-C7
Origin of supraspinatus?
Supraspinatus fossa
Insertion of supraspinatus?
Greater tubercle of humerus
Function of supraspinatus?
Abducts arm first 10-15 degrees
Innervation of supraspinatus?
Suprascapular nerve C5-C6
Origin of infraspinatus?
Infraspinatus fossa of scapula
Insertion of infraspinatus?
Greater tubercle of humerus
Function of infraspinatus?
Lateral rotation of arm
Innervation of infraspinatus?
Suprascapular nerve
Origin of teres minor?
Upper 2/3rd lateral border of scapula
Insertion of teres minor?
Greater tubercle of humerus
Function of teres minor?
Lateral rotation of arm
Innervation of teres minor?
Axillary nerve C5-C6
MAKE SURE YOU CAN NAME AND LABEL ALL THE LIGAMENTS ASSOCIATED WITH THE SHOULDER JOINT
Glenohumeral (sup, middle and inf.)
Coracohumeral
Transverse humeral
SLIDE 25
What is the function of the transverse humeral ligament?
Holds the biceps tendon in place
MAKE SURE YOU CAN NAME AND LABEL ALL THE LIGAMENTS ASSOCIATED WITH THE CLAVICLE
Acromioclavicular Corcacoacromial Conoid + Trapeziod = coracoclavicular Sternoclavicular Costoclavicular
SLIDE 26
What artery does the subclavian arise from?
RIGHT - bracheocephalic
LEFT - aortic arch
What are the branches of the subclavian artery? (5)
Dorsal scapular Costocervical trunk Internal thoracic Vertebral Thyrocervical trunk
Which neck of the humerus is most frequently fractured?
Surgical neck
What nerve and artery are at risk of damage in a fracture to the surgical neck of the humerus?
Axillary nerve
Posterior circumflex artery
What are the 2 anatomical ‘spaces’ found in the shoulder region?
Quadrangular
Triangular
What muscles make up the quadrangular space?
Long head of triceps
Teres minor
Teres major
What runs through the quadrangular space?
Axillary nerve
Posterior circumflex artery
What muscles make up the triangular space?
Teres major
Long head of triceps
What runs through the triangular space?
Radial nerve
Profunda brachii artery