Podcast
Questions and Answers
What is the origin of the Rectus Abdominis?
What is the origin of the Rectus Abdominis?
Crest of pubis
What action does the External Abdominal Oblique perform?
What action does the External Abdominal Oblique perform?
Laterally rotates trunk
Where does the Internal Abdominal Oblique insert?
Where does the Internal Abdominal Oblique insert?
Ribs 10-12
What is the action of the Transverse Abdominal Oblique?
What is the action of the Transverse Abdominal Oblique?
What action is performed by the Serratus Anterior?
What action is performed by the Serratus Anterior?
Where does the Pectoralis Major originate?
Where does the Pectoralis Major originate?
What action does the Trapezius muscle perform?
What action does the Trapezius muscle perform?
Where does the Latissimus Dorsi insert?
Where does the Latissimus Dorsi insert?
What is the primary action of the Diaphragm?
What is the primary action of the Diaphragm?
Where do the External Intercostals originate?
Where do the External Intercostals originate?
What action is performed by the Internal Intercostals?
What action is performed by the Internal Intercostals?
Where does the Rhomboideus Major insert?
Where does the Rhomboideus Major insert?
What action does the Erector Spinae perform?
What action does the Erector Spinae perform?
Where does the Splenius originate?
Where does the Splenius originate?
What is the action of the Quadratus Lumborum?
What is the action of the Quadratus Lumborum?
Where does the Semispinalis insert?
Where does the Semispinalis insert?
What action is performed by the Multifidus?
What action is performed by the Multifidus?
Flashcards
What is the Rectus Abdominis?
What is the Rectus Abdominis?
A long, flat muscle that runs vertically along the front of the abdomen. It helps compress the abdominal wall, which is important for tasks like breathing, childbirth, and defecation.
What is the External Abdominal Oblique?
What is the External Abdominal Oblique?
A large superficial muscle that covers the lateral part of the abdomen. It helps with trunk rotation and bending to the side.
What is the Internal Abdominal Oblique?
What is the Internal Abdominal Oblique?
A deep muscle located beneath the external oblique. It also helps with trunk rotation and contributes to bending to the side.
What is the Transverse Abdominal Oblique?
What is the Transverse Abdominal Oblique?
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What is the Serratus Anterior?
What is the Serratus Anterior?
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What is the Pectoralis Major?
What is the Pectoralis Major?
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What is the Trapezius?
What is the Trapezius?
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What is the Latissimus Dorsi?
What is the Latissimus Dorsi?
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What is the Diaphragm?
What is the Diaphragm?
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What are the External Intercostals?
What are the External Intercostals?
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What are the Internal Intercostals?
What are the Internal Intercostals?
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What is the Rhomboideus Major?
What is the Rhomboideus Major?
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What is the Erector Spinae?
What is the Erector Spinae?
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What is the Splenius?
What is the Splenius?
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What is the Quadratus Lumborum?
What is the Quadratus Lumborum?
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What is the Semispinalis?
What is the Semispinalis?
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What is the Multifidus?
What is the Multifidus?
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Study Notes
Muscles of the Trunk
-
Rectus Abdominis
- Originates from the crest of the pubis
- Inserts at the xiphoid process
- Function: Compresses the abdominal wall
-
External Abdominal Oblique
- Originates from ribs 5-12
- Inserts at the pubis
- Function: Laterally rotates the trunk
-
Internal Abdominal Oblique
- Originates from the iliac crest
- Inserts at ribs 10-12
- Function: Laterally rotates the trunk
-
Transverse Abdominal Oblique
- Originates from the iliac crest
- Inserts at the crest of the pubis
- Function: Laterally rotates the trunk
-
Serratus Anterior
- Originates from ribs 1-8
- Inserts at the vertebral border of the scapula
- Function: Abducts the scapula (moves them apart)
-
Pectoralis Major
- Originates from the clavicle
- Inserts at the crest of the greater tubercle of the humerus
- Function: Flexes the arm
-
Trapezius
- Originates from the posterior occipital bone
- Inserts at the clavicle
- Function: Extends and abducts the head
-
Latissimus Dorsi
- Originates from the crest of the ilium
- Inserts at the intertubercular groove of the humerus
- Function: Draws shoulders inferiorly
-
Diaphragm
- Originates from the xiphoid process
- Inserts at the central tendon
- Function: Facilitates inspiration and expiration
-
External Intercostals
- Originates from the inferior border of the ribs
- Inserts at the superior border of the ribs
- Function: Elevates ribs
-
Internal Intercostals
- Originates from the superior border of the ribs
- Inserts at the inferior border of the ribs
- Function: Depresses ribs
-
Rhomboideus Major
- Originates from the spines of T2-5 vertebrae
- Inserts at the lower third of the vertebral border of the scapula
- Function: Adducts the scapula (draws them together)
-
Erector Spinae
- Originates from the ilium
- Inserts at the ribs
- Function: Extends and rotates the head
-
Splenius
- Originates from C7-T6 vertebrae
- Inserts at the temporal bone
- Function: Extends and rotates the head
-
Quadratus Lumborum
- Originates from the posterior iliac crest
- Inserts at rib 12
- Function: Extends and abducts the vertebral column
-
Semispinalis
- Originates from C7-T12 vertebrae
- Inserts at the occipital bone
- Function: Extends the head
-
Multifidus
- Originates from the iliac crest
- Inserts into the vertebral column above the origin
- Function: Extends and rotates the vertebral column
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