3B - shoulder to elbow Flashcards
where does the arterial blood supply begin on the right side
brachiocephalic trunk
right subclavian artery
branched off of the brachiocephalic; courses beneath clavicle towards armpit to become axillary artery; branches off a vertebral artery (to brain)
cubital fossa
triangular shaped region at anterior aspect of elbow
phlebotomy
opening of a vein to diminish the blood supply
upper limb
extends from shoulder to hand
scapula
shoulder blade
subscapular fossa
origin of subscapularis
- anterior aspect
supraspinous fossa
origin of supraspinatus
- posterior aspect, above spine of scapula
infraspinous fossa
origin of infraspinatus
- posterior aspect, below spine of scapula
acromion
outward extension of the shoulder blade forming the point of the shoulder
glenoid fossa
the part of the scapula that joins with the humeral head to form the glenohumeral joint
coracoid process
process above the glenoid cavity that permits muscle attachment
3 borders of the scapula
superior, lateral, medial
supraglenoid tubercle
prominence superior to the glenoid cavity
clavicle
s-shaped bone that helps support the shoulder
concave clavicle
articulates with sternum (sternal articular surface)
convex clavicle
articulates with acromion of scapula
sternoclavicular joint
between sternum and clavicle
acromioclavicular joint
between acromion and clavicle
glenohumeral joint
the synovial ball-and-socket joint of the shoulder between the head of the humerus and glenoid fossa
scapulothoracic joint
not a “real” joint, but allows for movement between the scapula and thoracic cage, which is critical for arm abduction
anterior sternoclavicular ligament
helps to secure head of clavicle into sternum
costoclavicular ligament
band of connective tissue that unites the medial clavicle with the first rib
coracoacromial ligament
makes a connection between the coracoid process and the acromion
acromioclavicular ligament
connects the clavicle to the acromion
coracoclavicular ligament
connects the clavicle to the coracoid process
grade 1 shoulder separation
stretching of acromioclavicular ligament
grade 2 shoulder separation
rupture of acromioclavicular ligament, stretching of coracoclavicular ligament
grade 3 shoulder separation
rupture of acromioclavicular and coracoclavicular ligaments
coracohumeral ligament
connects head of humerus to the coracoid process
what are the 3 glenohumeral ligaments
superior, middle, inferior
glenoid labrum
thickening of fibrocartilage around the glenoid fossa. deepens the socket for better contact with the humeral head. may be torn with dislocations
scapulohumeral rhythm
a regular pattern of scapular rotation that accompanies and facilitates humeral abduction
which joint is responsible for arm abduction when there is less than 30° of abduction
glenohumeral joint
which joint is responsible for arm abduction when there is greater than 30° of abduction
glenohumeral and scapulothoracic joint
how many degrees does the glenohumeral joint move when the scapulothoracic joint moves 1 degree
2 degrees
axilla
fat-filled space providing passageway for blood vessels and nerves
axillary lymph nodes
concentrated in armpit, receive lymph from upper limb and female breast
axilla anterior border
pectoralis major and pectoralis minor
axilla medial border
serratus anterior and thoracic wall
axilla posterior border
subscapularis, teres major, latissimus dorsi
axilla lateral border
intertubercular sulcus
superficial layer muscles
extrinsic back, rhomboids and teres major
pectoral muscles
muscles of the chest; serratus anterior, pectoralis major, pectoralis minor
brachium muscles
deltoid, long head of biceps, long head of triceps
latissimus dorsi
- extends, adducts, and medially rotates the arm; draws the shoulder downward
- extend, adduct, and medially rotate humerus
which nerve innervates latissimus dorsi
thoracodorsal nerve
rotator cuff
group of muscles and their tendons that hold the head of the humerus securely in place as it rotates within the shoulder joint
which movements does the trapezius muscle perform
scapular elevation, depression, and retraction
which nerve innervates trapezius
accessory nerve, CN XI
- acts very similar to a spinal nerve
deep layer muscles
extrinsic back, supraspinatus, infraspinatus, teres minor, subscapularis
Saturday night palsy
brachial plexus nerve compression leading to wrist drop and sensory loss on posterior arm, radial nerve compression
rhomboids action
retract scapula, rotate glenoid cavity inferiorly
rhomboids innervation
dorsal scapular nerve
teres major innervation
lower subscapular nerve
teres major function
adduct and medially rotate arm
supraspinatus function
deep layer muscle, above the spine, initiate and assist with arm abduction
supraspinatus innervation
suprascapular nerve
infraspinatus innervation
suprascapular nerve
infraspinatus function
deep layer muscle, laterally rotate arm
teres minor innervation
axillary nerve
teres minor function
deep layer muscle, laterally rotate arm
subscapularis innervation
upper and lower subscapular nerves
subscapularis function
deep layer muscle, medially rotate arm
what is the acronym used to remember the four muscles of the rotator cuff
SITS
pectoralis major function
pectoral muscle, arm flexion and adduction
pectoralis major innervation
lateral and medial pectoral nerves
pectoralis minor function
pectoral muscle, scapular protraction
pectoralis minor innervation
medial pectoral nerve
serratus anterior innervation
long thoracic nerve
serratus anterior function
pectoral muscle, rotate and protract scapula
winged scapula
inactive serratus anterior allows medial border of the scapula to move backwards, while an intact pectoralis minor pulls coracoid forward, long thoracic nerve
deltoid innervation
axillary nerve
deltoid function
flexion, extension, abduction up to 90°
deltoid location
wraps around whole of shoulder
shoulder joint movements
abduction of the upper limb at the shoulder joint involves four different muscles, supplied by 4 different nerves, to achieve full range of motion from 0-180°
muscle and nerve for 0-15 degrees of motion in the shoulder joint
muscle - supraspinatus
nerve - suprascapular
muscle and nerve for 15-90 degrees of motion in the shoulder joint
muscle - deltoid
nerve - axillary
muscle and nerve for 90-160 degrees of motion in the shoulder joint
muscle - trapezius
nerve - accessory (cranial nerve XI)
muscle and nerve for 160-180 degrees of motion in the shoulder joint
muscle - serratus anterior
nerve - long thoracic
humerus
upper arm bone, long bone
humerus head
rounded section of the humerus that articulates with the glenoid cavity of the scapula
humerus anatomical neck
circumferential groove separating the head from the tubercle
humerus surgical neck
narrow part below tubercles, common fracture site
humerus body
shaft of the humerus
humerus greater tubercle
larger lateral prominence; site of the attachment of rotator cuff muscles
humerus lesser tubercle
inter tubercular sulcus (groove) where long head of biceps will run
humerus deltoid tuberosity
where the deltoid muscle attaches to the bone; will feel rough
humerus medial epicondyle
rough condyle proximal to the trochlea
humerus lateral epicondyle
small condyle proximal to the capitulum
humerus capitulum
articulates with head of radius
humerus trochlea
a flared medial condyle that articulates with the ulna
humerus olecranon fossa
ulna (olecranon)
flexor compartment
flexion of wrist and fingers, musculocutaneous nerve
- anterior on arm
- musculocutaneous nerve
extensor compartment
extension of wrist and fingers, radial nerve
- posterior
- radian nerve
biceps brachii
flexes and supinates forearm
long head
biceps brachii, crosses glenoid fossa
biceps brachii short head
attaches to coracoid process
biceps
muscles that allow for supination
coracobrachialis
muscle that allows for shoulder flexion
brachialis
muscle that allows for elbow flexion
Popeye sign
rupture of long head of biceps, generally not surgically repaired. minimal weakness in upper limb due to action of brachialis
humeral shaft fracture
may cause injury to the radial nerve resulting in wrist drop. common in young people with high-energy trauma, and older people with osteopenia
osteopenia
thinner than average bone density