Anatomy: Abdominal Muscles Flashcards
External Oblique Origin
External Surface of Lower 8 Ribs
External Oblique Insertion
Anterior Iliac Crest and Abdominal Aponeurosis
External Oblique Action
- Flex Trunk
- Contralateral Rotation
External Oblique Characteristics
- Non Ropy
- Superficial
Internal Oblique Origin
- Lateral Inguinal Ligament
- Iliac Crest
- Thoracolumbar Aponeurosis
Internal Oblique Insertion
- Cartilage of Lower 3 Ribs
- Abdominal Aponeurosis to Linea Alba
Internal Oblique Action
- Flex Trunk
- Compress Abdominal Contents
- Ipsilateral Lateral Flexion and Rotation of the Trunk
Internal Oblique Characteristics
- Non Ropy
- Deep
Transverse Abdominis Origin
- Lateral Inguinal Ligament
- Iliac Crest
- Thoracolumbar Aponeurosis
- Cartilage of Lower 6 Ribs
Transverse Abdominis Insertion
- Abdominal Aponeurosis to Linea Alba
Transverse Abdominis Action
- Compress Abdominal Contents
Transverse Abdominis Characteristics
- Non Ropy
- Deep
Diaphragm Origin
- Inner Surface of Lower 6 Ribs
- Upper 2 to 3 Lumber Vertebrae
- Inner Part of Xiphoid Process
Diaphragm Insertion
- Central Tendon
Diaphragm Action
- Draws down the central tendon during inspiration and increases the volume of the thoracic cage
Diaphragm Characteristics
- Non Ropy
- Deep
Temporalis Origin
Temporal Fossa and Fascia
Temporalis Insertion
Coronoid Process of the Mandible
Temporalis Actions
- Elevate Mandible
- Retract Mandible
Temporalis Characteristcs
- Non Ropy
- Superficial
Masseter Origin
Zygomatic Arch
Masseter Insertion
Angle and Ramus of Mandible
Masseter Action
- Elevates Mandible
- Protract Mandible
Masseter Characteristics
- Non Ropy
- Superficial and Deep
Medial Pterygoid Origin
- Medial Surface of Lateral Pterygoid Plate of the Sphenoid Bone
- Tuberosity of Maxilla
Medial Pterygoid Insertion
Inner Surface of Ramus of the Mandible
Medial Pterygoid Action
- Elevates Mandible
- Protracts Mandible
- Moves Mandible Side to Side
Medial Pterygoid Characteristics
- Non Ropy
- Deep
Lateral Pterygoid Origin
Sphenoid Bone
Lateral Pterygoid Inserion
- Articular Disc and Capsule of TMJ
- Neck of Mandible
Lateral Pterygoid Action
- Depresses Mandible
- Moves Mandible Side to Side
