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

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

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

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

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

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

Abdominal muscles: Transverse section Figures 11.5

Abdominal muscles From Snell

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

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

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

Measuring Respiratory Function: Spirometry SPPA 2050 Speech Anatomy & Physiology

SPPA 2050 Speech Anatomy & Physiology Spirometry SPPA 2050 Speech Anatomy & Physiology

Lung Volumes & Capacities SPPA 2050 Speech Anatomy & Physiology

Rest vs. Speech Breathing SPPA 2050 Speech Anatomy & Physiology

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