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Quiz 2
muscles of upper back and arm
108
Anatomy
Graduate
06/09/2013

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Term
Location of Trapezius
Definition
Most of upper back in a sort of triangle shape
Term
Proximal (origin) Attachment of trapezius
Definition
medial third of superior nuchal line/ External occipital protuberance/nuchal ligament/spinous processes of C7-T12
Term
Distal attachment (insertion) of trapezius
Definition
Lateral third of clavicle/acromion/ spine of scapula
Term
Innervation of trepezius
Definition
Spinal root of accessory nerve (motor)/ C3&C4 (pain and proprioception)
Term
Main action of trapezius
Definition
superior fibers elevate/ middle fibers retract/ inferior fibers depress scapula/ sup and inf fibers cause sup rotation of scapula which rotates the inferior angle outward.
Term
Latissimus Dorsi
Definition
covers lower back
Term
Origin of Latissimus dorsi
Definition
spinous processes of T7-T12/ thoracolumbar fascia, iliac crest/ inferior 3 or 4 ribs
Term
Insertion of latissimus dorsi
Definition
floor of intertubercular groove of humerus
Term
Innervation of Lat Dorsi
Definition
Thoracodorsal nerve (C6,7,8)
Term
Main action of Lat Dorsi
Definition
extends, adducts, and medially rotates humerus/ raises body toward arms during climbing.
Term
Rhomboid Minor and Major
Definition
upper back
Term
Origin of rhomboid
Definition
Minor-C7, T1
Major- T2-T5
Term
Insertion of rhomboid
Definition
medial border of scapula
Term
Innervation of rhomboid
Definition
dorsal scapular nerve
Term
action of rhomboid
Definition
fixes scap to thoracic wall/ rotates inf angle of scap medially to depress glenoid cavity
Term
Erector Spinae
Definition
Iliocostalis, longissimus, spinalis
Term
Origin of all erector spinae
Definition
iliac crest, sacrum, sacral and lumbar spinous processes, supraspinous ligament
Term
Members of Iliocostalis
Definition
lumborum, thoracis, cervicis
Term
insertion of iliocostalis
Definition
ribs and cervical transverse processes
Term
Members of longissimus
Definition
thoracis, cervicis, capitis
Term
Insertion of longissimus
Definition
between tubercle and angle of rib, transverse processes, mastoid process
Term
Members of spinalis
Definition
cervicis, thoracis, capitis
Term
insertion of spinalis
Definition
spinous processes and skull
Term
Origin of sternocledomastoid
Definition
mastoid process
Term
insertion of sternocledomastoid
Definition
sternum and medial portion of clavicle
Term
innervation of sternocledomastoid
Definition
spinal accessory nerve
Term
action of sternocledomastoid
Definition
sidebends head toward the ipsilateral side and rotates it away from ipsilateral side
Term
Origin of levator scapulae
Definition
posterior tubercles of transverse processes of c1-c4 verts
Term
insertion of levator scapulae
Definition
superior part of medial border of scapula
Term
innervation of levator scapulae
Definition
dorsal scapular and cervical nerve
Term
action of levator scapulae
Definition
elevates scapula and tilts glenoid cavity inferiorly by rotating scapula/ sidebends neck and rotates it on the same side.
Term
Origin of scalene
Definition
transverse processes of C2-C7
Term
Innervation of scalene
Definition
C3-C8
Term
Insertion of scalene
Definition
anterior and middle-first rib/ posterior- 2nd rib
Term
action of scalene
Definition
elevates 1st and 2nd rib/ sidebends and rotates cervical spine toward ipsilateral side
Term
Subocciptal triangle is made of these
Definition
Rectus capitis major and minor, obliquus capitis sup and inf
Term
Subocciptal triangle innervated by
Definition
dorsal ramus of C1 (suboccipital nerve)
Term
Action of suboccipital triangle
Definition
extend head on C1/ rotate C1 on C2
Term
Rectus capitus posterior major
Definition
goes from C1 spinous process to lateral part of inferior nuchal line
Term
Rectus capitis posterior minor
Definition
goes from C1 posterior tubercle to medial part of inf nuchal line
Term
Obliquus capitis superior
Definition
C1 transverse process to occiput
Term
obliquus capitis inferior
Definition
C2 spinous process to C1 transverse process
Term
Origin of deltoid
Definition
lateral third of clavicle, acromion, spine of scapula
Term
insertion of deltoid
Definition
deltoid tuberosity of humerus
Term
innervation of deltoid
Definition
axillary nerve (c5 and c6)
Term
action of deltoid
Definition
anterior-flexes and rotates arm
middle-abducts arm
posterior- extends and laterally rotates arm
Term
origin of supraspinatus
Definition
supraspinous fossa of scapula
Term
insertion of supraspinatus
Definition
superior facet on greater tubercle of humerus
Term
innervation of supraspinatus
Definition
suprascapular nerve
Term
action of supraspinatus
Definition
initiates and assists deltoid in abduction of arm and acts with rotator cuff muscles
Term
origin of infraspinatus
Definition
infraspinatus fossa of scapula
Term
insertion of infraspinatus
Definition
middle facet on greater tubercle of humerus
Term
innervation of infraspinatus
Definition
suprascapular nerve
Term
action of infraspinatus
Definition
laterally rotates arm/ help to hold humeral head in glenoid cavity of scapula/ depresses humeral head
Term
origin of teres minor
Definition
superior part of lateral border of scapula
Term
insertion of teres minor
Definition
inferior facet on greater tubercle of humerus
Term
innervation of teres minor
Definition
axillary nerve
Term
action of teres minor
Definition
depress scap/ hold hum head in glen cavity/ laterally rotate arm/ same as infraspinatus
Term
origen of teres major
Definition
dorsal surface of inferior angle of scapula
Term
insertion of teres major
Definition
medial lip of intertubercular groove of humerus
Term
innervation of teres major
Definition
lower part of subscapular nerve
Term
action of teres major
Definition
adducts and medially rotates arm
Term
origin of subscapularis
Definition
subscapular fossa
Term
insertion of subscapularis
Definition
lesser tubercle of humerus
Term
innervation of subscapularis
Definition
upper and lower subscapular nerve
Term
action of subscapularis
Definition
medially rotates and adducts arm/ helps hold humeral head in glenoid cavity
Term
origin of pectoralis major
Definition
clavicular head (anterior surface of medial half of clavicle)/ sternocostal head (anterior surface of sternum and superior 6 costal cartilages and aponeurosis of external oblique muscle)
Term
insertion of pec major
Definition
lateral lip of intertubercular groove of humerus
Term
innervation of pec major
Definition
lateral and medial pectoral nerves
Term
action of pec major
Definition
adducts and medially rotates hum/ draw scap inferiorly and anteriorly/ clavicular head flexes hum/ sternocostal head extends from flexed position
Term
origin of pec minor
Definition
3-5 ribs near costal cartilage
Term
insertion of pec minor
Definition
medial border and superior surface of coracoid process of scapula
Term
innervation of pec minor
Definition
medial pectoral nerve
Term
action of pec minor
Definition
stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall
Term
origin of subclavius
Definition
1st rib junction with costal cartilage
Term
insertion of subclavius
Definition
inferior surface of middle third of clavicle
Term
innervation of subclavius
Definition
nerve to subclavius
Term
action of subclavius
Definition
protracts scapula and holds it against thoracic wall/ rotates scapula
Term
origin of serratus anterior
Definition
exterior surface of lateral part of ribs 1-8
Term
insertion of serratus anterior
Definition
anterior surface of medial border of scapula
Term
innervation of serratus anterior
Definition
long thoracic nerve
Term
action of serratus anterior
Definition
protracts scap and holds it against thoracic wall/ rotates scapula (inferior angle laterally)
Term
origin of biceps brachii
Definition
short head: tip of coracoid process of scapula. Long head: supraglenoid tubercle of scapula
Term
insertion of biceps
Definition
radial tuberosity and fascia of forearm via bicipital aponeurosis
Term
innervation of biceps
Definition
musculocutaneous nerve
Term
action of biceps
Definition
suppinates forearm, flexes forearm, flexes shoulder
Term
origin of brachialis
Definition
distal half of anterior surface of humerus
Term
insertion of brachialis
Definition
coranoid process and tuberosity of ulna
Term
innervation of brachialis
Definition
musculocutaneous nerve
Term
action of brachialis
Definition
flexes forearm in all positions
Term
origin of coracobrachialis
Definition
tip of coranoid process of scapula
Term
insertion of coracobrachialis
Definition
middle third of medial surface of humerus
Term
innervation
Definition
musculocutaneous nerve
Term
action
Definition
flexes and adducts arm
Term
origin of triceps brachii
Definition
long head (infraglenoid tubercle of scapula) latteral head ( posterior surface of humerus-sup to radial groove) medial head (posterior surface of humerus-inferior to radial groove)
Term
insertion of triceps
Definition
proximal end of olecrenon of ulna and fascia of forearm
Term
innervation of triceps
Definition
radial nerve
Term
action of triceps
Definition
extends forearm and arm (chief extensor)
Term
origin of anconeus
Definition
lateral epichondyle of humerus
Term
insertion of anconeus
Definition
lateral surface of of olecranon and superior part of posterior surface of ulna.
Term
innervation of anconeus
Definition
radial nerve
Term
action of anconeus
Definition
assists triceps in extending forearm
Term
Atlas (C1)
Definition
has no body and no spinous processes, has transverse processes, anterior arch, superior and inferior facet joints, and transverse foramen
Term
what motion does OA flexion cause?
Definition
chin tuck
Term
what motion does OA extension cause?
Definition
jaw thrust
Term
Axis (C2)
Definition
has dens, large spinous process (sup and inf), has motion
Term
what happens to facets in the AA joint during rotation?
Definition
rise into peaks in neutral, dip into valley during rotation
Term
does the aa joint allow sidebending?
Definition
no, they have a rocking motion
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