51X-Upper Limbs Flashcards
(50 cards)
what muscles are considered the Scapulohumeral muscles & what do they surround?
Deltoid Supraspinatus Infraspinatus Teres Minor Teres Major Subscapularis
surround the pectoral girdle
What is the Origin / insertion / Innervation of the Deltoid?
O: Acromial extremity of clavicle, acromion & spine of scapula
Insert: Deltoid tuberosity of humerus
Inner: axillary nerve
What are the actions of the deltoid
entire muscle abducts arm @ shoulder
anterior fibers flex & medially rotatearm
Posterior fibers extend & laterally rotate
Describe the deltoid muscle and how it abducts
is a multipennate muscle. anterior / posterior muscle serve as fixators and the medial muscle acts as prime mover
What scapulohumeral muscles insert at the greater tubercle of the humerus
Supraspinatus
Infraspinatus
Teres Minor
What is the Origin/ Insertion / innervation of Supraspinatus muscle
O: Supraspinatus fossa of scapula
Inser: greater tubercle of humerus
Inner: Suprascapular nerve
Action of the Spraspinatus muscle?
assists deltoid w/ initial stage of abducting arm @ shoulder & continues act throughout abduction
The origin / insertion/ innervation of Infraspinatus muscle
O: infrasinpatus fossa of scapula
Insert: Greater tubercle of humerus
Inner: suprascapular nerve
Infraspinatus muscle action
laterally rotates arm @ shoulder
Teres minor Origin / insertion / Innervation
O: middle lateral border of scapula
Insert: greater tubercle of humerus
Inner: suprascapular nerve
Action of Teres minor
Laterally rotates & adducts arm @ shoulder joint
what is the origin / insertion / innervation of Teres Major
O: Inferior lateral border (angle) of scapula
Insert: Intertubercular sulcus of humerus
Inner: lower subscapular nerve
actions of Teres Major
adducts, medially rotates, & extends arm (dorsally) @ shoulder joint
what is the origin / insertion / innervation of Subscapularis
O: subscapular fossa of scapula
Insert: Lesser Tubercle of humerus
Inner: Upper / lower subscapular nerve
action of subscapularis
medially rotate arm @ shoulder
What muscles make up the Rotator Cuff
Supraspinatus
Infraspinatus
Subscapularis
Teres Minor
The Rotator Cuff muscles all originate from where & form what?
0: from scapula;
form a single tendon unit as they combine to form a “cuff” over head of humerus
Which Rotator Cuff muscle does not rotate The humerus
Supraspinatus
What ligament forms an arch that prevent the superior displacement of humeral head from the glenoid cavity of scapula?
Coracoacromial ligament;
Spans between acromion & Coracoid process forming the coracoaromial arch
What is the purpose of the Axilla & Where is it located?
Provides passageway for vessels & Nerves to reach upper limb
Pyramidal space inferior to glenehmmeral joint & Superior to axillary fascia @ junction of arm & thorax
This portion of the Axilla is between the 1st rib, clavicle & superior edge of subscapularis
Apex
This portion of the Axilla is for med by the Concave skin, subcutaneous tissne, & axillary fascia extending from the arm to thoracic wall?
Base
Axillary wall formed by scapula & subscapularis muscle, teres major, & latissimus dorsi
Posterior wall
This Axillary wall is formed by pectoral’s major & minor, & pectoral & clavicopectoral fascia
Anterior Wall
