U pper Middle and Lower fibers AxioScapular AxioClavicular group Attachments Proximal Superior nuchal line on occipital bone posterior skull C1T12 vertebrae spinous process ID: 375348
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Slide1
Trapezius:
U
pper, Middle, and Lower fibersSlide2
Axio-Scapular/ Axio-Clavicular group
Attachments:
Proximal:
Superior nuchal line on occipital bone (posterior skull) + C1-T12
vertebrae
(
spinous process
)
Distal:
Upper: lateral
clavicle
Middle: acromion + spine of
scapula
Lower: base (medial end) of spine of
scapula
Action: (scapular motion)
U: UPWARD rotate, ADduct (retract), elevate
M: ADduct (retract)
L: UPWARD rotate, ADduct (retract), depress
PERIPHERAL NERVE +
spinal cord level of origin:
Cervical nerves + cranial nerve XI (spinal accessory nerve)
Spinal segments:
C1,2,3,4,5 Slide3
Levator scapulaeSlide4
Axio-Scapular/ Axio-Clavicular group
Attachments:
Proximal:
upper cervical
vertebrae
(
transverse process of C1-C4
)
Distal:
medial boarder of
scapula
, superior to spine
Action: (scapular motion)
Elevate, downward rotate
PERIPHERAL NERVE +
spinal cord level of origin:
Cervical nerves: 3,4 + dorsal scapular nerve: C5
Spinal segments:
C3,4,5 Slide5
Rhomboid minor Slide6
Axio-Scapular/ Axio-Clavicular group
Attachments:
Proximal:
lower cervical
vertebrae
(
spinous process of C7-T1)
Distal:
medial border of
scapula
, at base of spine
Action: (scapular motion)
Elevate, ADduct
(retract), downward rotate
PERIPHERAL NERVE
+ spinal cord level of origin:
Dorsal scapular nerve: C5
Spinal segment:
C5 Slide7
Rhomboid major Slide8
Axio-Scapular/ Axio-Clavicular
Attachments:
Proximal:
upper thoracic
vertebrae
(spinous process of T2-T5
)
Distal:
medial border of
scapula
, inferior to spine
Action: (scapular motion)
Elevate, ADduct
(retract), downward rotate
PERIPHERAL NERVE
+ spinal cord level of origin
Dorsal scapular nerve: C5
Spinal segment:
C5 Slide9
Serratus anterior Slide10
Axio-Scapular/ Axio-Clavicular group
Attachments:
Proximal:
lateral surface of
ribs
1-8
Distal:
medial border of
scapula,
entire length, on COASTAL surface
Actions: (scapular motion)
UPWARD rotate, ABduct
(protract) – prevents winging
PERIPHERAL NERVE
+ spinal cord level of origin:
Long thoracic nerve: C5,6,7
Spinal segments:
C5,6,7 Slide11
Pectoralis minor Slide12
Axio-Scapular/ Axio-Clavicular group
Attachments:
Proximal:
anterior surface of
ribs
3-5
Distal:
coracoid process of
scapula
Actions
: (scapular motion)
ABduct
(protract), downward rotate, depress
PERIPHERAL NERVE
+ spinal cord level of origin:
Lateral + medial pectoral nerves: C5,6,7 + C8, T1
Spinal segment
s
:
C7,C8 Slide13
Pectoralis major:
Clavicular head (upper fibers)Sternal head (lower fibers)Slide14
Axio- Humeral group
Attachments:
Proximal:
Clavicular head (CL) – medial
clavicle
sternal head (ST) –
sternum
(manubrium and body of sternum, plus the adjacent costal cartilages of ribs 2-6)
Distal:
All fibers to LATERAL lip of the intertubercular groove of the
humerus
(crest of the greater tubercle)
Actions:
CL head: flex, ADduct, IR, H. AD the gleno-humeral joint
ST head: extend (from 180), ADduct, IR, H. AD the gleno-humeral joint
ELEVATE TRUNK in closed kinematic chain with humerus stabilized (weight bearing on hands)
(ALSO: protract + depress shoulder girdle)
PERIPHERAL NERVE + spinal cord level of origin:
CL head = LATERAL pectoral nerve: C5,6,7
ST head = Lateral + Medial pectoral nerves: C5,6,7 + C8, T1
Spinal segments:
CL head: C5,6,7
ST head: C6,7,8, T1Slide15
Latissimus dorsi Slide16
Axio-Humeral group
Attachments:
Proximal:
Vertebral column
from T7 to sacrum +
iliac crest
(T7-T12 is directly from spinous process of vert., while L+S levels and iliac crest are via thoraco-lumbar fascia
)
Also, (small attachment to inferior tip of scapula)
Distal:
FLOOR of intertubercular groove of
humerus
Actions
:
Extend, ADduct, IR, H. AB at gleno-humeral joint
ELEVATE TRUNK in closed kinematic chain with humerus stabilized (weight bearing on hands)
(ALSO: retract + depress shoulder girdle, and downward rotate scapula via small attachment to inferior tip of scapula)
PERIPHERAL
NERVE
+
spinal cord level of origin:
Thoracodorsal nerve: C6,7,8
Spinal
segments:
C6,7,8 Slide17
Supraspinatus
Muscle of the ROTATOR CUFF
“S---” of “SITS”Slide18
Scapulo-
Humeral group
Attachments:
Proximal:
supraspinous fossa of
scapula
Distal:
greater
tubercle of
humerus
, UPPER facet
Actions
:
ABduct
at gleno-humeral joint
(does NOT rotate
) Also; supports head of humerus in glenoid fossa
PERIPHERAL NERVE
+ spinal cord level of origin:
Suprascapular nerve: C5,6
Spinal
segment:
C5Slide19
Infraspinatus
Muscle of the ROTATOR CUFF
“-I--” of “SITS”Slide20
Scapulo-Humeral group
Attachments:
Proximal:
infraspinous fossa of
scapula
Distal:
greater
tubercle of
humerus
, MIDDLE facet
Actions
:
External rotation of gleno-humeral joint. Also; depress head of humerus (compress + stabilize the GH jt)
PERIPHERAL
NERVE
+
spinal cord level of origin:
Suprascapular nerve: C5,6
Spinal
segments:
C5,6Slide21
Teres minor
Muscle of the ROTATOR CUFF
“- -T-” of “SITS”Slide22
Scapulo-Humeral group
Attachments:
Proximal:
lateral boarder of
scapula
at mid-length
Distal:
greater
tubercle of
humerus
, LOWER facet
Actions
:
External rotation of gleno-humeral joint. Also; depress head of humerus
(Compress + stabilize the GH jt).
PERIPHERAL NERVE
+
spinal cord level of origin:
Axillary nerve: C5,6
Spinal
segments:
C5,6 Slide23
Subscapularis
Muscle of the ROTATOR CUFF
“- - - S” of “SITS”Slide24
Scapulo-Humeral group
Attachments:
Proximal:
subscapular fossa of
scapula
Distal:
lesser
tubercle of
humerus
Actions
:
Internal rotation of gleno-humeral joint. Also, depress head of humerus
PERIPHERAL
NERVE
+
spinal cord level of origin:
Upper + lower subscapular nerves: C5,6
Spinal
segments:
C5,6Slide25
Deltoid:
Anterior, Middle, and Posterior fibers Slide26
Scapulo-Humeral group
Attachments:
Proximal
:
Anterior: lateral
clavicle
Middle: acromion process of
scapula
Posterior: spine of
scapula
Distal:
ALL to deltoid tuberosity of
humerus
(Compare this to gluteus medius arrangement, especially the actions)
Actions
:
A: ABduct, flex, IR and H. AD at GH jt
M: ABduct GH jt
P: ABduct, extend, ER, and H. AB at GH jt
PERIPHERAL NERVE
+ spinal cord level of origin:
Axillary nerve: C5,6
Spinal
segments:
C5,6 Slide27
Teres majorSlide28
Scapulo-Humeral group
Attachments:
Proximal
:
lateral boarder of
scapula
at inferior angle
Distal:
MEDIAL lip of intertubercular groove of
humerus
(crest of lesser tubercle)
Actions
:
Extend, ADduct, IR at GH jt
PERIPHERAL NERVE
+
spinal cord level of origin:
Lower subscapular nerve: C5,6
Spinal
segment:
C6Slide29
CoracobrachialisSlide30
Scapulo-Humeral group
Attachments:
Proximal:
coracoid process of
scapula
Distal:
mid-humerus
, medial side
Actions
:
Flex, ADduct at GH jt
PERIPHERAL
NERVE
+
spinal cord level of origin:
Musculocutaneous nerve: C5,6,7
Spinal
segments:
C6,7Slide31
Biceps brachii:
Long head, Short headSlide32
Scapulo-Forearm group
Attachments:
Proximal:
Long head: supraglenoid tubercle of
scapula
Short head: coracoid process of
scapula
Distal:
BOTH heads; radial tuberosity + bicipital aponeurosis
Actions
:
Both heads: flex GH jt + flex elbow, supinate forearm
PERIPHERAL
NERVE +
spinal cord level of origin:
Musculocutaneous nerve: C5,6,7
Spinal
segments:
C5,6Slide33
Triceps brachii:
Long head, Lateral head, and Medial head (deep) Slide34
Scapulo-Forearm group
Attachments:
Proximal:
L
ong head: infraglenoid tubercle of
scapula
Lateral head: posterior
humerus
, superior to radial groove
Medial head (deep): posterior
humerus
, inferior to radial groove
Distal:
ALL 3 heads; olecranon process of
ulna
Actions
:
Long head: extend GH joint
ALL 3 HEADS: extend elbow joint
PERIPHERAL NERVE
+ spinal cord level of origin:
Radial nerve: C5-T1
Spinal
segments:
C7,C8 Slide35
AnconeusSlide36
Scapulo-Forearm group
Attachments:
Proximal:
lateral epicondyle of
humerus
Distal:
olecranon process of
ulna
Actions
:
Extend elbow joint
PERIPHERAL
NERVE
+
spinal cord level of origin:
Radial nerve: C5-T1
Spinal
segments:
C7,C8 Slide37
BrachialisSlide38
Elbow: muscles of the brachium acting at the elbow
Attachments:
Proximal:
anterior distal shaft of
humerus
Distal:
anterior proximal shaft of
ulna
(ulnar tuberosity)
Actions
:
Flex elbow
PERIPHERAL
NERVE
+
spinal cord level of origin:
Musculocutaneous nerve: C5,6,7
Spinal segment
s
:
C5,6Slide39
BrachioradialisSlide40
Elbow: muscles of the brachium acting at the elbow
Attachments:
Proximal:
lateral supracondylar ridge of
humerus
Distal:
styloid process of distal
radius
Actions
:
Flex elbow
PERIPHERAL
NERVE
+
spinal cord level of origin:
Radial nerve: C5-T1
Spinal segments:
C5,6