1. SPPA 2050 Speech Anatomy & Physiology
Diaphragm M.
Origin:
Internal circumference of lower thorax
Ventral: xiphoid process
Lateral: lower 6-7 ribs
Dorsal: upper lumbar vertebrae
Insertion:
central tendon
Action:
draws down central tendon increasing
vertical dimension of the thorax
Nerve supply:
Phrenic nerve (C3-5)
Figure 5.13
SPPA 2050 Speech Anatomy & Physiology

2. SPPA 2050 Speech Anatomy & Physiology
Views of the Thorax
Transverse Section
Lateral
SPPA 2050 Speech Anatomy & Physiology
From Snell

3. SPPA 2050 Speech Anatomy & Physiology
Rectus abdominis M.
Origin: pubis
Insertion:
cartilage of R5-R7
xiphoid process
Action:
compresses the abdominal contents
Nerve supply:
Intercostal N. (7-11)
Figures 11.1, 11.12
SPPA 2050 Speech Anatomy & Physiology

4. Transverse abdominis M.
Origin:
lower ribs
vertebral column
anterior part of iliac crest
Insertion:
abdominal aponeurosis
Action:
compresses abdominal contents
Nerve supply:
Intercostal N. (7-11)
Figure 11.1
SPPA 2050 Speech Anatomy & Physiology

5. SPPA 2050 Speech Anatomy & Physiology
Internal oblique M.
Origin:
anterior part of iliac crest
inguinal ligament
Insertion:
cartilages of lower 3-4 ribs
abdominal aponeurosis
Action:
compresses the abdominal contents
Nerve supply:
Intercostal N. (7-11)
Figures 11.1, 11.12
SPPA 2050 Speech Anatomy & Physiology

6. SPPA 2050 Speech Anatomy & Physiology
External oblique M.
Origin:
R5-R12
Insertion:
anterior part of iliac crest
abdominal aponeurosis
Action:
compresses the abdominal contents
Nerve supply:
Intercostal N. (7-11)
SPPA 2050 Speech Anatomy & Physiology
Figures 11.1, 11.12

7. Abdominal muscles: Transverse section
Figures 11.5

8. Abdominal muscles
From Snell

9. Abdominal muscle actions
Figures 11.9, 11.10
SPPA 2050 Speech Anatomy & Physiology

10. Respiratory system is redundant
When faced with a number of options, which one do you use?
Considerations
Mechanical advantage
Assistance/opposition to environmental forces
Muscle mass
Ability to effect thoracic volume change
SPPA 2050 Speech Anatomy & Physiology

11. SPPA 2050 Speech Anatomy & Physiology
Respiratory Function
SPPA 2050 Speech Anatomy & Physiology

12. Measuring Respiratory Function: Spirometry
SPPA 2050 Speech Anatomy & Physiology

13. SPPA 2050 Speech Anatomy & Physiology
Spirometry
SPPA 2050 Speech Anatomy & Physiology

14. Lung Volumes & Capacities
SPPA 2050 Speech Anatomy & Physiology

15. Rest vs. Speech Breathing
SPPA 2050 Speech Anatomy & Physiology

16. Respiratory Function: Aerodynamics
Respiratory Measure
Vital Capacity
Residual Volume
Resting Expiratory End Level
Rest Breathing
Speech Breathing
Tidal Volume
Inspiratory/Expiratory Timing
Respiratory Rate
Alveolar Pressure
Average Flow
Remember a few, calculate the rest
SPPA 2050 Speech Anatomy & Physiology