2.5 Scapular & Pectoral Regions Flashcards
What forms the girdle of the upper limb?
clavicle and scapula
The head of the humerus articulates with the … of the scapula
glenoid cavity
The inter tubercular groove is between the tubercles and holds the tendon of the …
long head of the biceps brachia m.
“V” shaped roughened area on lateral aspect of mid shaft of humerus where deltoid m. inserts
Deltoid tuberosity
What muscle does elevation action at pectoral girdle?
levator scapulae
What muscle does depression action at pectoral girdle?
Trapezius
What muscle does protraction (abduction) action at pectoral girdle?
Pectoralis minor
What muscle does retraction (adduction) action at pectoral girdle?
Rhomboid major and minor
What muscle does lateral rotation (upward) action at pectoral girdle?
Trapezius
What muscle does medial rotation (downward) action at pectoral girdle?
Rhomboid major and minor
What muscle does flexion at the glenohumeral joint?
Deltoid (anterior fibers)
What muscle does extension at the glenohumeral joint?
Deltoid (posterior fibers), latissimus dorsi
What muscle does abduction at the glenohumeral joint?
Deltoid (middle fibers) , supraspinatus (initiates first 15 degrees)
What muscle does adduction at the glenohumeral joint?
Pectorals major, latissimus doors, theres major
What muscle does medial rotation at the glenohumeral joint?
Subscapularis, teres major, deltoid (anterior fibers)
What is the main source of arterial blood for the upper limb?
subclavian artery
The subclavian artery gives rise to several branches including the … which supplies muscles of the scapula via … and … arteries
thyrocervical trunk (supra scapular and transverse cervical arteries)
The subclavian artery becomes the … as it crosses the lateral border of the first rib.
axillary artery
What nerve innervates the trapezius?
spinal accessory n.
What nerve innervates the latissimus dorsi?
Thoracodorsal n.
What nerve innervates the levator scapulae?
dorsal scapular n.
What nerve innervates the rhomboid minor?
dorsal scapular n.
What nerve innervates the rhomboid major?
dorsal scapular n.
What is the innervation of the pectoralis major m?
medial and lateral pectoral nerves
What is the action of the pectoralis major m?
adducts and medially rotates humerus, flexes humerus
Proximal attachment of pectoralis major m?
clavicular head and sternocostal head
What is the distal attachment of the pectoralis major m?
lateral lip of inter tubercular sulcus of humerus
What is the innervation of the pectoralis minor m?
medial pectoral n.
What is the action of pectoralis minor m?
protracts, depresses, stabilizes scapula
What is the proximal attachment of the pectoralis minor m?
ribs 3-5
What is the distal attachment of the pectoralis minor muscle?
coracoid process of scapula
What is the innervation of the subclavius m?
nerve to subclavius
What is the action of the subclavius muscle?
anchors and depresses clavicle
What is the proximal attachment of the subclavius m?
junction of 1st rib and its costal cartilage
What is the distal attachment of the subclavius m?
inferior surface of middle third of clavicle
A clavicular fracture may result in injury to …
brachial plexus
Clavicular fracture may sever … leading to fatal hemorrhage or thromboembolism.
subclavian v.
What is the innervation of the serrates anterior m?
long thoracic n
What is the action of the serrates anterior m?
protracts scapula; rotates scapula
What is the proximal attachment of the serrates anterior m?
ribs 1-8
What is the distal attachment of the serrates anterior m?
anterior surface of medial border of scapula
Winged scapula is the common cause in … paralysis?
serrates anterior m
Winged scapula is dues to a lesion of the …
long thoracic n.
What are the muscles of the “rotator cuff”?
supraspinatus, infraspinatus, teres minor, and subscapularis
What is the innervation of the Deltoid m?
axillary nerve
What is the action of the Deltoid m?
Flexes and medially rotates arm, abducts arm, extends and laterally rotates arm
What is the proximal attachment of the Deltoid m?
lateral clavicle, acromion, spine of scapula (posteriorly)
What is the distal attachment of the Deltoid m?
deltoid tuberosity of humerus
What is commonly damaged with fracture of the surgical neck of humerus?
axillary nerve and posterior humeral circumflex a
Axillary nerve injury may result in … atrophy, loss of sensation in skin of shoulder, and weakness
deltoid m
What is the innervation of the Supraspinatus m?
suprascapular n
What is the action of the Supraspinatus m?
initiates and assists deltoid in abduction of arm
What is the proximal attachment of the Supraspinatus m?
Supraspinous fossa of scapula
What is the distal attachment of the Supraspinatus m?
greater tubercle of humerus
What is the innervation of the Infraspinatus m?
supra scapular n
What is the action of the Infraspinatus m?
lateral rotation of arm
What is the proximal attachment of the Infraspinatus m?
infraspinous fossa of scapula
What is the distal attachment of the Infraspinatus m?
greater tubercle of humerus
What is the innervation of the Teres minor m?
axillary nerve
What is the action of the Teres minor m?
lateral rotation of arm
What is the proximal attachment of the Teres minor m?
lateral border of scapula
What is the distal attachment of the Teres minor m?
greater tubercle of humerus
What is the innervation of the Subscapularis m?
upper and lower subscapular nerves
What is the action of the Subscapularis m?
medially rotates and adducts arm
What is the proximal attachment of the Subscapularis m?
subscapular fossa of scapula
What is the distal attachment of the Subscapularis m?
lesser tubercle of humerus
What is the innervation of the Teres major m?
lower subscapular n
What is the action of the Teres major m?
adducts and medially rotates arm
What is the proximal attachment of the Teres major m?
inferior angle of scapula
What is the distal attachment of the Teres major m?
medial lip of intertubercular sulcus of humerus
