Classification of muscles of the trunk

1
Classification of muscles of the trunk
2
Figure 4.1
3
Section 2 The Muscles of Trunk ?. The
muscles of back trapezius, latissimus,
levattor scapulae, rhomboid muscles
erector spinae (sacrospinelis)
thoracolumbar fascia?. The muscles of thorax
1) The extrinsic muscles pectoralis
major, pectoralis minor, serratus anterior 2)
The intrinsic muscles intercostales
extrerni, intercostales interni? . The
diaphragm? . The muscles of abdomen
3
4
4
5
Muscles of Thorax
Page 118, 646
Muscle Origin Insertion Action Innervation
Pectoralis major Sternum, Ribs 2-6 Inter-tubercular groove of humerus Adduct, Flex, Med Rotate Arm M L pectorals
Pectoralis minor Ribs 3-5 Coracoid process of scapula Depress, Rotate scapula M L pectorals
Serratus anterior (ventralis) Ribs 1-9 Scapula Protract, Rotate scapula Long Thoracic
6
Muscles of Thorax
Page 49
Muscle Origin Insertion Action Innervation
Trapezius Ligamentum nuchae, C7-T12 Clavicle, Spine acromion of scapula Elevate, Adduct, Rotate, Depress Accessory
Levator Scapulae C1-C4 Medial border of scapula Elevate scapula D. Scapular
Rhomboids C7-T5 Medial border of scapula Adduct, Elevate, Rotate D. Scapular
7
Muscles of Thorax
Muscle Origin Insertion Action Innervation
Deltoids Clavicle, Spin acromion of scapula Deltoid tuberosity of humerus Flex, Abduct, Extend, Lat med. rotate arm Axillary
Latissimus dorsi Iliac crest, Sacrum, T7-12, Lumbar fascia Inter-tubercular groove of humerus Extend, Adduct, Med. rotate arm Thoraco-dorsal
8
Anterior Surface of Thorax

• Palpate the following
• Sternum (3 parts)
• Jugular notch
• Sternal Angle ( 2nd rib)
• Clavicle
• Costal margin
• Xiphosternal joint
• Midclavicular Line
• Midaxillary Line

Page 201
9
Posterior Surface of Thorax

• Palpate the following
• Spinous Process of C7
• Scapula (ribs 2-7)
• Scapular spine
• Acromion Process
• Inferior Angle of Spine
• Inferior Border

Page 90
10
Locating Internal Structures

• Pleural Cavities
• Inferior margin adjacent to T12 in Posterior
  Midline
• To Rib 10 at Midaxillary line
• To Rib 8 at Midclavicular line
• To Xiphosternal joint medially
• Lungs posterior border is 2 ribs superior to
  pleural cavity (rib 8)
• Heart
• Deep to xiphisternal angle

Page 206
11
11
12
12
13
13
14
Pectoralis Major
Pectoralis Minor
15
Trapezius In more primitive species used for
opening and closing gills - a BRANCHIAL
muscle. In humans, used to move scapula and keep
head up
16
Trapezius Origin Occipital bone, Spines of C7
and T1-12 Insertion Acromion Spine of
scapula Lateral 1/3 of clavicle
17
Trapezius Innervation Accessory Nerve (Cranial
Nerve XI) Action Extension of the
head Elevation and depression of scapula
18
Trapezius
19
Serratus Anterior Origin First 9
ribs Insertion Medial edge of scapulas deep
surface
20
Serratus Anterior Innervation Long thoracic
nerve Action Rotates scapula Primitively a
BODY WALL MUSCLE
21
Serratus Anterior
22
Levator Scapulae Origin Transverse processes of
C1-4 Insertion Medial edge of scapula
23
Levator Scapulae Innervation Ventral Rami of C3
and C4 Action Retracts scapula Depresses
glenoid
24
Rhomdoidius Major Origin Spines of
T2-T5 Insertion Medial edge of scapula
25
Rhomdoidius Major Innervation Dorsal
Scapula Action Retracts scapula Depresses
glenoid
26
Rhomdoidius Minor Origin Spines of C7 and
T1 Insertion Medial edge of scapula Note
minor is superior (cranial), but SMALLER
27
Rhomdoidius Minor Innervation Dorsal
Scapula Action Retracts scapula Depresses
glenoid
28
Levator Scapulae Rhomboid Minor Rhomboid
Major
29
Levator Scapulae
Depression
Rhom- boids
Pecoralis Minor
30
Elevation
Trapezius
Serratus Anterior
Trapezius
31
Latissimus Dorsi Origin Spines of
T7-T12 Thoracolumbar fascia Insertion Humerus
Inertubecular groove And lesser tubecular
crest Innervation Thoracodorsal Nerve
32
Latissiumus Extends, adducts and medially
rotates humerus Pectoralis is large, fan-shaped
muscle opposing it ventrally
33
Pectoralis Major Clavicular Head Origin
inferior margin of clavicle Insertion
Delto-pectoral crest of HUMERUS Sternal
Head Origin Ventro-lateral margin of
sternum Insertion Delto-pectoral crest of
HUMERUS
34
Pectoralis Major Clavicular Head Origin
inferior margin of clavicle Insertion Greater
tubercular crest of HUMERUS Innervation Medial
and lateral pectoral nerves
35
Pectoralis Major Sternal Head DEPRESSOR,
ADDUCTOR of humerus Origin Ventro-lateral
margin of sternum costal cartilages
1-6 Insertion Greater tubercular crest of
HUMERUS Innervation Medial and lateral
pectoral nerves
36
Pectoralis MINOR Deep to Pec. Major OriginRibs
3-6. Insertion Coracoid Process of
Scapula Innervation Function Stabilization of
scapula Positionally important for understanding
location of other structures.
37
Elevators
Teres Major
Origin Lower edge of scapula Insertion Lesser
tubercular crest Action Extends, Adducts
Medially rotates humerus Innervation Lower
scapular
38
Elevators
Subscapularis
Origin Deep surface of scapula Insertion Lesser
tubercle Action Medially rotates
humerus Innervation Upper and lower scapular
39
Internal View Subscapularis
40
(No Transcript)
41
Elevators
Teres Minor
Origin Lower edge of scapula Insertion Greater
tubercle Action Laterally rotates
humerus Innervation Axillary
42
Teres Minor