bb ch 7, 42, 45 - quiz 3 Flashcards
What is the origin of trapezius?
Posterior skull (occipital bone)
Spinous processes of all c vertebrae via ligament (ligamentum nuchae)
Spinous process of all t vertebrae
What is the insertion of trapezius?
lateral 1/3 of clavicle
acromion
crest of spine of scapula, superior lip (origin of deltoid)
What is the action of trapezius?
Upward rotation of scapula
Depress/elevate scapula and lateral clavicle
What is the innervation of trapezius?
CN XI accessory n
Ventral rami of C3 + C4
What is the origin of latissimus dorsi?
lower 3-4 ribs
spinous processes of lower 6 T vertebrae
Spinous processes of L + S vetebrae via aponeurosis
Iliac crest
What is the insertion of latissimus dorsi?
Intertubercular groove of humerus
What is the action of latissimus dorsi?
Add arm
ext arm
IR arm
What is the innervation of latissimus dorsi?
Thoracodorsal n.
What is the origin of levator scapulae?
Transverse processes of CV1-CV4
What is the insertion of levator scapulae?
Medial border of scapula, superior to scapular spine
What is the action of levator scapulae?
elevation of scapula
What is the innervation of levator scapulae?
Ventral rami of C3 and C4
What is the origin of rhomboid minor?
Spinous processes of CV7 and TV1
What is the insertion of rhomboid minor?
medial border of scapula at scapular spine
What is the action of rhomboid minor?
Adduction of scapula
What is the innervation of rhomboid minor?
Dorsal scapular nerve
What is the origin of rhomboid major?
Spinous processes of TV2 to TV5
What is the insertion of rhomboid major?
medial border of scapula inferior to scapular spine
What is the action of rhomboid major?
adduction of scapula
What is the innervation of rhomboid major?
dorsal scapular nerve
What is the other name for erector spinae?
Sacrospinalis
How many muscles is erector spinae made of? Which ways are they oriented?
3 longitudinal muscles
Where does erector spinae split into three muscles? What are the names, specifically medial to lateral? Briefly describe each of the three.
Splits above the 12th rib
Spinalis - cm wide muscle along spine
Longissimus - longest, reaches the skull
Iliocostalis - most lateral, ilium to ribs, where it inserts
I LOVE SPAGHETTI
Where does erector spinae originate?
Sacrum and ilium
What is the innervation of erector spinae and muscles that split off of it?
Segmental innervation from dorsal rami
What is the action of erector spinae?
It is an important postural muscle that holds the spine erect by extending the vertebral column
What is the origin of deltoid?
Crest of spine of scapula, inferior lip
Acromion
Lateral third of clavicle
What is the insertion of deltoid?
deltoid tuberosity of humerus
What is the action of deltoid?
Clavicular (ant.): flex arm, IR arm
Acromial (middle): abd arm
Spinous (post.): extend arm, ER arm
What is the innervation of deltoid?
axillary n
What is the origin of supraspinatus?
supraspinous fossa
What is the insertion of supraspinatus?
greater tubercle of humerus, superior third
What is the action of supraspinatus?
abd arm 0-30 degrees in scapular plane
What is the innervation of supraspinatus?
suprascapular n.
Where is the supraspinatus tendon and what is likely in this location?
Between acromion and head of humerus, subject to impingement, degeneration, rupture
What is the origin of infraspinatus?
infraspinous fossa
What is the insertion of infraspinatus?
greater tubercle of humerus, middle third
What is the action of infraspinatus?
ER arm
What is the innervation of infraspinatus?
suprascapular n.