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Questions and Answers
What is the origin of the Rectus Abdominis?
Crest of pubis
What action does the External Abdominal Oblique perform?
Laterally rotates trunk
Where does the Internal Abdominal Oblique insert?
Ribs 10-12
What is the action of the Transverse Abdominal Oblique?
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What action is performed by the Serratus Anterior?
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Where does the Pectoralis Major originate?
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What action does the Trapezius muscle perform?
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Where does the Latissimus Dorsi insert?
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What is the primary action of the Diaphragm?
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Where do the External Intercostals originate?
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What action is performed by the Internal Intercostals?
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Where does the Rhomboideus Major insert?
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What action does the Erector Spinae perform?
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Where does the Splenius originate?
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What is the action of the Quadratus Lumborum?
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Where does the Semispinalis insert?
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What action is performed by 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
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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
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of the muscles of the trunk with these flashcards. Each card includes essential information such as origin, insertion, and action for key muscles. Perfect for anatomy students looking to reinforce their understanding.
