Muscles of the UQ Flashcards
UFT Origin
1” behind mastoid process, superior nuchal line, ligamentum nuchae, Supraspinous ligament of c-spine (C1-C7) , SP of C7
MFT Origin
SP of T1-T5
LFT Origin
SP of T6-T12
UFT Insertion
posterior border of the lateral 1/3rd of the clavicle , acromion process of scapula
MFT Insertion
medial margin of acromion process. superior lip of crest of the spine of scapula
LFT Insertion
tubercle of spine of scapula (superior aspect)
Trapezius Actions
elevation of the scapula (UFT), upward rotation of scapula (all 3), retraction of scapula (all 3), depression of scapula (LFT), pull head backwards (bilateral contraction)(UFT) , pull head laterally (unilateral contraction)(UFT) , rotate head to opposite side (UFT)
Trapezius Nerve
spinal accessory nerve, CN XI (cranial nerve 11)
Levator Scapulae Origin
posterior tubercles of TPs of C1 to C4
Levator Scapulae Insertion
superior angle of scapula, vertebral border of the scapula until it reaches the root of the spine of the scapula
Levator Scapulae Actions
elevation of scapula (with origin fixed), Retraction (limited due to FD), downward rotation of scapula, Side bend of head (unilateral contraction), assists in extension of the C/S (bilateral contraction)
Levator Scapulae Nerve
Dorsal Scapular C4, 5
Rhomboid Major Origin
SP of T2 to T5, supraspinous ligament
Rhomboid Major Insertion
vertebral border just below the root of the spine to inferior angle
Rhomboid Major Actions
Retraction, elevation. downward rotation
Rhomboid Major Nerve
dorsal scapular nerve C4, C5
Rhomboid Minor Origin
lower ligamentum nuchae, SP of C7 & T1
Rhomboid Minor Insertion
vertebral border, At root of the spine of the scapula
Rhomboid Minor Actions
Retraction, Elevation, downward rotation
Rhomboid Minor Nerve
dorsal scapular nerve C4, C5
Serratus Anterior Origin
finger like slips (serratus), from outer surfaces of upper eight ribs
Serratus Anterior Insertion
Ventral/costal surface of vertebral border of scapula
Serratus Anterior Actions
upward rotation of scapula, protraction of scapula, holds medial border of scapula against rib
Serratus Anterior Nerve
Long Thoracic Nerve, C5 to upper 2 slips, C6 to middle 2 slips, C7 to lower 4 slips
Pectoralis Minor Origin
superior outer border of anterior end of ribs 3,4, & 5 , lateral to costal cartilage
Pectoralis Minor Insertion
medial border of coracoid process
Pectoralis Minor Actions
protraction of scapula, downward rotation of scapula, aids with forced inspiration
Pectoralis Minor Nerve
Medial Pectoral Nerve C 6, 7, 8, T1
Pectoralis Major Clavicular Head Origin
Anterior aspect of medial half of clavicle
Pectoralis Major Sternal Head Origin
Length of sternum, cartilages of upper 6 ribs, fascia
Pectoralis Major Clavicular Head Insertion
lateral lip of bicipital groove of humerus, broad aponeurosis
Pectoralis Major Sternal Head Insertion
Lateral lip of bicipital groove, proximal & posterior to clavicular head
Pectoralis Major Action
adduction, internal rotation, flexion/extension of GH joint (extends GH from 90 of flexion to 0, deep inspiration
Pectoralis Major Nerve
Lateral pectoral C5-7 (upper & lower), Medial pectoral C8 & T1 (lower fibres)
Latissumus Dorsi Origin
SP’s of T6-T12, SP’s of L1-L5, upper sacral, posterior 1/2 of iliac crest, lower 3 or 4 ribs, inferior angle of scapula
Latissumus Dorsi Insertion
floor of bicipital groove (underneath biceps tendon), infront of teres major tendon, forms posterior fold of axilla
Latissumus Dorsi Action
extension of GH joint, adduction of GH joint, internal rotation of GH joint, raises trunk to hands in climbing, respiration, prevents upward push of shoulder girdle
Latissumus Dorsi Nerve
Thoraco-dorsal nerve C6-8 (posterior cord of brachial plexus)
Teres Major Origin
dorsal surface of inferior angle, lower 1/3 of axillary border of scapula
Teres Major Insertion
medial lip of bicipital groove
Teres Major Action
extension, adduction, internal rotation of GH joint
Teres Major Nerve
lower subscapular nerve C5-7
Teres Minor Origin
upper 2/3 of axillary border of scapula
Teres Minor Insertion
inferior facet of the greater tuberosity (posterior aspect), lower part of GH capsule
Teres Minor Action
extension & lateral rotation of GH joint, coaptation
Teres Minor Nerve
Circumflex (axillary) nerve
Subscapularis Origin
subscaular fossa
Subscapularis Insertion
lesser tuberosity, anterior aspect of capsule of GH joint, posterior wall of axilla
Subscapularis Action
medial rotation of GH joint, stabilizes anterior GH joint, coaptation
Subscapularis Nerve
Upper & Lower Subscapular Nerve
Supraspinatus Origin
supraspinous fossa
Supraspinatus Insertion
superior facet of greater tuberosity, blends with capsule
Supraspinatus Action
abduction of GH joint (initiates first 10-20›), holds head of humerus in glenoid cavity
Supraspinatus Nerve
Suprascapular Nerve C4-6
Infraspinatus Origin
infraspinatus fossa
Infraspinatus Insertion
middle facet of greater tuberosity (posteriorly), posterior joint capsule
Infraspinatus Action
Extension, lateral rotation of GH joint, stabilizes head of humerus (coaptation)
Infraspinatus Nerve
Suprascapular Nerve C4-6
Deltoid Anterior Fibre Origin
anterior aspect of lateral third of clavicle
Deltoid Middle Fibre Origin
lateral superior border of acromion
Deltoid Posterior Fibre Origin
inferior border of crest of spine of scapula
Deltoid Insertion
deltoid tuberosity, lateral aspect of the mid-shaft of the humerus
Deltoid Action
abduction, flexion, extension, medial & lateral rotation of GH joint
Deltoid Nerve
Axillary Nerve C5-6
Coracobrachialais Origin
tip of coracoid process, tendinous origin, shares origin with biceps brachii
Coracobrachialais Insertion
halfway down medial border of shaft of humerus
Coracobrachialais Action
adduction & flexion of GH joint
Coracobrachialis Nerve
musculocutaneous Nerve C6-7
Biceps Brachii Short Head Origin
tip of the coracoid process, shares with coracoidbrachialis
Biceps Brachii Long Head Origin
supraglenoid tubercle of scapula (travels through bicipital groove)
Biceps Brachii Insertion
Tuberosity of the radius, bicipital aponeurosis
Biceps Brachii Action
supination of radio-ulnar joint, flexion of elbow, flexion of GH joint, stabilizes head of humerus
Biceps Brachii Nerve
musculocutaneous Nerve C5-7
Brachialis Origin
lower 1/2 of anterior humerus
Brachialis Insertion
ulnar tuberosity
Brachialis Action
elbow extension
Brachialis Nerve
musculocutaneous nerve
Triceps Long Head Origin
infrglenoid tuberclem blends with fibrous capsule
Triceps Lateral Head Origin
posterior inferior aspect of greater tuberosity (above radial groove)
Triceps Medial Head Origin
posterior distal hald of humerus, below radial groove, deep to other two heads
Triceps Insertion
posterior edge of superior aspect of the olecranon process
Triceps Action
extension of the elbow joint, extension of the GH joint, stabilizes inferior aspect of the GH joint
Triceps Nerve
Radial nerve C6-8, T1
Anconeus Origin
lateral epicondyle, posterior surface of the humerus
Anconeus Insertion
lateral side of olecranon process, upper 1/4 of posterior surface of ulna
Anconeus Action
extension of elbow joint, stabilizes ulna during pronation/supination
Anconeus Nerve
Radial nerve C7-8