1. Muscles of the chest and abdomen
Lab #19
Muscles of the chest and abdomen

2. Lab 19: Muscles of the chest and abdomen
Note: if it’s not on the list, you don’t have to locate it or write about it in the lab report

3. Muscles to know pectoralis major serratus anterior
intercostals (external, internal)
diaphragm
rectus abdominus
obliques (external, internal)
transverse abdominus
trapezius
latissimus dorsi
splenius capitus

4. Oblique and rectus muscles
Lie within the body wall
Generally:
obliques groups are lateral
rectus muscles lie on the anterior midline

5. Oblique and Rectus Muscles
Oblique muscles:
compress underlying structures
rotate vertebral column
Rectus muscles:
flex vertebral column
oppose erector spinae

6. Cervical Oblique Muscles
FYI: Cervical region:
scalene muscles
flex the neck

7. Oblique and Rectus Muscles of the Thoracic region
Figure 11–11a, b

8. Thoracic Oblique Muscles
Thoracic region:
intercostal muscles (external and internal intercostals):
respiratory movements of ribs
FYI: transversus thoracis:
cross inner surface of ribs

9. Thoracic Rectus Group Diaphragmatic muscle or diaphragm:
divides thoracic and abdominal cavities
performs respiration

10. Oblique and Rectus Muscles of the Abdominopelvic region
Figure 11–11a, c

11. Abdominopelvic Oblique Muscles
Abdominopelvic region (same pattern as thoracic):
external oblique muscles
internal oblique muscles
Transversus abdominis – deep to internals

12. Rectus Group -Abdominopelvic
Rectus abdominis:
between xiphoid process and pubic symphysis
divided longitudinally by linea alba
divided transversely by tendinous inscriptions

13. Summary: Oblique and Rectus Muscles
Table 11–9 (1 of 2)

14. Muscles that Position the Pectoral Girdle
Figure 11–14b

15. Muscles that Position the Pectoral Girdle (1 of 3)
Trapezius:
HUGE
superficial
covers back and neck to base of skull
inserts on clavicles and scapular spines

16. Muscles that Position the Pectoral Girdle (2 of 3)
Rhomboid and levator scapulae:
deep to trapezius
attach to cervical and thoracic vertebrae
insert on scapular border

17. Muscles that Position the Pectoral Girdle (3 of 3)
Serratus anterior:
on the chest
originates along ribs
inserts on anterior scapular margin
“serrated”

18. Summary: Muscles that Position the Pectoral Girdle
Tables 11–11

19. Note
Seven of the muscles of the shoulder (on quiz 1) are in Lab 20, exercise 1 which we won’t get to until next week but you still need to learn them for the quiz next week (Quiz 8)

20. Lab 20 exercise 1 Locate the 7 shoulder muscles from your list:
deltoid
teres major
infraspinatus
supraspinatus
subscapularis
levator scapulae
rhomboid

21. Muscles that Move the Arm
Figure 11–15b

22. Muscles that Move the Arm (1 of 3)
Deltoid:
the major abductor of arm
Supraspinatus:
assists deltoid
Subscapularis and teres major:
produce medial rotation at shoulder

23. Muscles that Move the Arm (2 of 3)
Infraspinatus:
produce lateral rotation at shoulder

24. Muscles that Move the Arm (3 of 3)
Pectoralis major:
between anterior chest and greater tubercle of humerus
produces flexion at shoulder joint
Latissimus dorsi:
between thoracic vertebrae and humerus
produces extension at shoulder joint

25. Shoulder flexion vs extension
Lats and portion of delts
Pecs and portion of delts

26. The Rotator Cuff Muscles involved in shoulder rotation
supraspinatus, subscapularis, infraspinatus, teres minor,and their tendons

27. Muscles that Position the Pectoral Girdle
Rhomboid and levator scapulae:
deep to trapezius
attach to cervical and thoracic vertebrae
insert on scapular border
Also saw trapezius and serratus anterior

28. Today Work through activities 1-3 with books, models.
Cut 4 and 5 except splenius capitus in activity four; besides that one, you don’t have to do any of 4 or 5
Lab report #19 due (with 18) next week