SPPA 2050 Speech Anatomy & Physiology

I.MUSCLES OF INSPIRATION

muscle / origin / insertion / Mechanical action / Motor supply
Diaphragm
External intercostals
Internal intercostals
Intercartilaginous
Levator costarum
(Costal elevators)
Serratus posterior superior
Sternocleidomastoid
Scalenes
Serratus anterior
Pectoralis minor
Pectoralis major
  1. MUSCLES OF EXPIRATION
  2. MUSCLES AFFECTING PRIMARILY THE THORAX

muscle / origin / insertion / Mechanical action / Motor supply
Internal intercostals
Interosseous
Serratus posterior inferior
Transverse thoracis

III.MUSCLES OF EXPIRATION

b. MUSCLES AFFECTING PRIMARILY THE ABDOMEN

muscle / origin / insertion / Mechanical action / Motor supply
Rectus abdominis
External obliques
Internal obliques
Transversus abdominis

III.MUSCLES OF INSPIRATION

muscle / origin / insertion / Mechanical action / Motor supply
Diaphragm / Internal circumference of lower thorax
-Ventral: xiphoid process
-Lateral: lower 6-7 ribs
-Dorsal: upper lumbar vertebrae / Central tendon / draws down central tendon increasing vertical dimension of the thorax / Phrenic nerve (C3-C5)
External intercostals / Outer lip of the caudal border of bony portion ofeach rib / Outer lip of rostral border of rib below / Elevates ribs / Intercostal N. (from T1-T11)
Internal intercostals
Intercartilaginous / Inner lip of the caudal border of the chondral portion of each rib / Inner lip of rostral border of rib below / Elevates ribs / Intercostal N.
Levator costarum
(Costal elevators) / Transverse processes of C7-T11 / Brevis: rib immediately below
Longis: lower 5 muscles also have fibers that inserts on the next rib down / Elevates ribs / Intercostal N.
Serratus posterior superior / Spinous processes of C7-T3 / R2-R5 / Elevates ribs / Intercostal N.
Sternocleidomastoid / Manubrium of the sternum
Medial clavicle / Mastoid process of temporal bone / elevate the sternum and clavicle / Spinal accessory nerve (C. XI)
Scalenes / 3 muscles
-anterior
-middle
-posterior
Transverse processes of C3-C7 / R1-R2 / Elevates R1-R2 / Spinal Nerves (C4-C8)
Serratus anterior / Elevates ribs
Pectoralis minor / Elevates ribs
Pectoralis major / Elevates ribs
  1. MUSCLES OF EXPIRATION
  2. MUSCLES AFFECTING PRIMARILY THE THORAX

muscle / origin / insertion / Mechanical action / Motor supply
Internal intercostals
Interosseous / Inner lip of the caudal border of the bony portion of each rib / Inner lip of rostral border of the bony portion of the rib below / Lowers the rib cage / Intercostal N.
Serratus posterior inferior / Spinous processes of T11-12, L1-L3 / R8-R12 / Lowers the rib cage / Intercostal N.
Transverse thoracis / Body of sternum Xiphoid
Chondral surface of R5-R7 / R2-R6 / Depresses the ribs / Intercostal N.

III.MUSCLES OF EXPIRATION

b. MUSCLES AFFECTING PRIMARILY THE ABDOMEN

muscle / origin / insertion / Mechanical action / Motor supply
Rectus abdominis / Pubis / Cartilage of R5-R7
Xiphoid process / Compresses the abdominal contents / Intercostal N.
(7-11)
External obliques / R5-R12 / Anterior part of iliac crest
Abdominal aponeurosis / Compresses the abdominal contents / Intercostal N.
(7-11)
Internal obliques / Anterior part of iliac crest
Inguinal ligament / Lower borders of the cartilages of lower 3-4 ribs
Abdominal aponeurosis / Compresses the abdominal contents / Intercostal N.
(7-11)
Transversus abdominis / Lower ribs
Vertebral column
Anterior part of iliac crest / Abdominal aponeurosis / Compresses the abdominal contents / Intercostal N.
(7-11)