lecture 4 Flashcards
(26 cards)
what are examples of scapular muscles?
deltoid, supraspinatus, infraspinatus, teres minor, subscapularis, teres major
what are deltoid:
- origin(3)
- insertion
- innervation
- action
- lateral clavicle, acromion, spine of scapula
- deltoid tuberosity of humerus
- axillary nerve
- major abductor of humerus from 15-90 degrees; the diff. part of the deltoid muscle allow it to do all actions except adduction
what are supraspinatus:
- origin
- insertion
- innervation
- action
- what type of muscle is it?
- supraspinous fossa
- greater tubercle of humerus
- suprascapular nerve
- abduction 0-15 degrees
- rotator cuff muscle
what are infraspinatus:
- origin
- insertion
- innervation
- action
- what type of muscle is it?
- infraspinous fossa
- greater tubercle of humerus
- suprascapular nerve
- action : lateral rotator
- rotator cuff muscle
what are subscapularis:
- origin
- insertion
- innervation
- action
- what type of muscle is it?
- subscapular fossa
- lesser tubercle
- upper and lower subscapular nerve
- medially rotates and adducts
- rotator cuff muscle
what are teres major:
- origin
- insertion
- innervation
- action
- inferior angle of the scapula
- medial upper humerus (anterior surface)
- lower subscapular nerve
- adduction, medial rotation
The shoulder joint is a WHAT w/ articulation b/w WHAT?
- ball and socket joint
2. glenoid cavity and head of humerus
Movement at the shoulder joint include what?(4)
- abduction/adduction
- flexion/extension
- medial rotation/lateral rotation
- circumduction
what are 4 full range movement at the shoulder depend on?(4)
- glenohumeral joint movement
- strenoclavicular joint movement
- acromioclavicular joint movement
- scapular rotation
pure abduction of the WHAT is limited to 90 degrees by WHAT?
- arm
2. acromion
the deltoid muscle is only effective in WHAT after initiation by WHAT
abduction
supraspinatus muscle
What is rotator cuff also called
SITS muscles
rotator cuff :
- the shoulder joint has no what?
- the shoulder joint is supported by WHAT of WHAT
- the rotator cuff has a major role in stabilizing WHAT in the WHAT during shoulder movement?
- ligaments
- tendons of rotator cuff muscles
- head of humerus in glenoid fossa (dynamic stabilization)
rotator cuff acts in rotation of WHAT ?
- humerus
WHAT injury to the rotator cuff often involves what overlying the hwta
what structures can be HWAT in the small space between WHAT?
- inflammation; supraspinatus tendon, subdeltoid bursa
2. supraspinatus tendon and subdeltoid bursa; acromion and humerus
shoulder dislocation occurs in what direction? why?
what can dislocation damage
- occurs in the anterior and inferior direction because the joint capsule is reinforced superiorly, anteriorly, and posteriorly by rotator cuff tendons but not inferiorly
damage axillary artery and nerve
the rotator cuff is formed by tendinous insertions of which muscles?
a. Supraspinatus
b. Infraspinatus
c. Tres Minor
d. Subscapularis
mnemonics: SUPper In Them(n) SUBurbs
upper limb muscle testing:
- deltoid
- supraspinatus
- infraspinatus and tres minor
- rotator cuff (especially supraspinatus)
- subscapularis
- impingement test
- resisted abduction of arm at 90 degrees
- resisted initial abduction
- resisted lateral rotation
- inverted soda can
- resisted medial rotation or lift-off test
- inverted can test- specific for supraspinatus impingement or tendonitis
another name for axilla?
armpit
axilla conveys WHAT type of structures from WHERE
- neurovascular structure
2. neck and upper limb
what are the boundary of the armpits?
a. anterior?(2)
b. posterior?(2)
c. medial?
d. lateral?
a. clavicle and pectoral muscles
b. scapula and subscapularis muscle
c. serratus anterior muscle
d. humerius
what 6 things are in the armpit?
Axillary artery
- Axillary vein
- Brachial plexus
- Long head of the biceps brachii muscle
- Short head of the biceps brachii muscle
- Coracobrachialis muscle
axillary artery:
- extends to and from WHERE?
- divides into how many parts by WHAT?
- 1ST part is proximal to WHAT and superior thoracic artery to WHAT?
- 2ND part is posterior to WHAT? and splits into 2 things: a.WHAT type of trunk w/ WHAT to WHERE(5)? b. a high;y varible what to where
5.3RD part is distal to WHAT? and splits into 3
WHAT type of artery that divides into WHAT(2) and def.? anterior WHAT and its frequency? posterior WHAT and larger than WHAT?
- from 1st rib to inferior margin of teres major muscle
- 3 parts by pectoralis minor muscle
- pectoralis minor muscle
- 1st/2nd intercostal spaces(small); throracromial trunk w/ branches to shoulder, acromion, deltoid, clavicle, and pectoral muscles
- pectoralis minor muscle; subscapular(largest branch of axillary artery); thoracodorsal and circumflex scapular arteries; humeral circumflex artery and absent sometimes; humeral circumflex artery( usually larger than its anterior partner.
abduction of WHAT above 90 degrees requires WHAT?
arm
lateral scapular rotation
