Muscles of the Back and Upper Limb Flashcards
Origin of Trapezius muscle
C7-T12, Nuchal line, Occipital protuberence, ligament nuchae
Insertion of Trapezius
Acromion, Spine of scapula and Clavicle
Innervation of Trapezius
Cranial nerve 9
Action of Trapezius
Extend, Depress and retracts, rotates scapula
Origin of Latissimus dorsi
Iliac crest, inferior three ribs, T7-L5
Insertion of Latissimus dorsi
Humerus
Innervation of Latissimus dorsi
Thoracodorsal or medial sub-scapular nerve
Action of Latissimus dorsi
Adduct, extend and medially rotates humerus at shoulder
Levator scapulae origin
Transverse process of C1-C4
Levator scapulae insertion
Medial border of scapula
Levator scapulae innervation
Dorsal scapula n and C3-C4 n
Levator scapulae action
Elevates scapula and rotates it (by tilting glenoid cavity inferiorly)
Rhomboid major and minor origin
Minor: Ligamentum niche, C7-T1
Major: T2-T5
Rhomboid major and minor innervation
Dorsal scapular n
Rhomboid major and minor insertion
Medial border of scapula
Rhomboid major and minor action
Retracts scapula and rotates it to depress glenoid cavity. Fixes scapula to thoracic wall
Deltoid origin
Clavicle, Acromium, Spine of scapula
Deltoid insertion
Deltoid tuberosity on humerus
Deltoid innervation
Axillary nerve (C5-C6)
Deltoid action
Anterior part: Flexes and medially rotates
Middle part: Abduct
Posterior part: Extend and laterally rotates arm at shoulder
Teres major origin
inferior angle scapula
Teres major insertion
humerus
Teres major innervation
lower sub scapular n (C5-C6)
Teres major action
adducts arm and medially rotates shoulder
Serratus anterior origin
upper eight ribs
Serratus anterior insertion
scapula
Serratus anterior action
rotates and protracts scapular, pulls it anteriorly to thoracic wall
Serratus anterior innervation
long thoracic n
Subclavius origin
junction between costal cartilage and 1st rib
Subclavius insertion
clavicle
Subclavius innervation
subclavius (C5-C6)
Subclavius action
depress and anchors clavicle
Pectoralis major origin
Clavicle, Sternum, Costal cartilages; aponeurosis of external abdominal oblique
Pectoralis major insertion
humerus
Pectoralis major innervation
lateral (C5-C7) and medial pectoral (C8-T1)
Pectoralis major action
Flexes, adducts and medially rotates arm at shoulder
Pectoralis minor origin
3rd to 5th ribs and deep fascia
Pectoralis minor insertion
Coracoid process of scapula
Pectoralis minor innervation
medial pectoral nerve (C8-T1)
Pectoralis minor action
depresses and protracts scapula
Capsule and Articular disc
Surrounds acromioclavicular joint
Allows gliding and sliding movement when arm is raised and rotated
Coracoclavicular ligament
Between the coracoid process and the clavicle
Reinforces the joint by stabilizing the clavicle
Acromioclavicular joint
Between the acromium and the clavicle
Supports the joint superiorly
Fibrous capsule of glenohumeral joint
Surrounds joint. Permits abduction, adduction, flexion, extension, circumduction. Most commonly dislocated joint
Glebohumeral ligament
Has middle, inferior and superior thickenings
Glenoid cavity to humerus
Coracohumeral
Between the coracoid process and greater tubercule of humerus
Transverse humeral
Spans the greater and lesser tubercle of humerus
Holds long head of biceps tendon in intertubercular groove
Glenoid labrum
Fibrocartilagionous ligament that deepens glenoid cavity
Margin of glenoid cavity of scapula
Subacromial
Between the coracoacromial arch and suprascapular muscle
Subdeltoid
Between the deltoid muscle and capsule
Subscapular
Between subscapularis tendon and scapular neck