Paraspinal and abdominal muscles Flashcards
What is the action of the Erector spinae during bilateral contraction?
Spine extension
Erector spinae is responsible for extending the spine when both sides contract.
What actions does the Erector spinae perform during unilateral contraction?
Spine lateral flexion and rotation
This occurs when one side of the Erector spinae contracts.
What is the origin of the Iliocostalis portion of the Erector spinae?
Spinous processes T11-L5, posterior sacral crests, posterior Iliac crest
These anatomical structures provide the starting point for the Iliocostalis muscle.
Where does the Iliocostalis insert?
Lower 6 ribs (lumbar region); Lower 6 to upper 6 ribs (thoracic region); Upper 6 ribs and transverse processes C4-7 (cervical region)
These are the attachment points for the Iliocostalis muscle.
What is the action of the Longissimus portion of the Erector spinae?
Spine extension and lateral flexion
Longissimus also assists in rotating the spine.
What is the origin of the Longissimus muscle?
Spinous processes of lumbar vertebrae, spinous processes T1-6
These points indicate where the Longissimus muscle begins.
Where does the Longissimus muscle insert?
Transverse processes of thoracic vertebrae, adjacent ribs, transverse processes C2-6, mastoid process of the temporal bone
These are the various insertion points for the Longissimus muscle.
What is the action of the Spinalis portion of the Erector spinae?
Spine extension
The Spinalis primarily extends the spine.
What is the origin of the Spinalis muscle?
Spinous processes of T11-L2, spinous process of C7
These structures serve as the origin for the Spinalis muscle.
Where does the Spinalis muscle insert?
Spinous processes of T1-6, spinous processes of C2-C6
These are the insertion points for the Spinalis muscle.
What is the primary function of the Multifidus muscle?
Stabilise the vertebrae
Multifidus plays a crucial role in spinal stability.
What is the origin of the Multifidus muscle?
Posterior sacrum
This is where the Multifidus begins.
Where does the Multifidus muscle insert?
Transverse processes of L5-C1, spinous processes of L5-C1
These are the attachment points for the Multifidus muscle.
What is the action of the Rectus abdominis muscle?
Lumbar flexion
Rectus abdominis facilitates bending at the lumbar spine.
What is the origin of the Rectus abdominis muscle?
Crest of pubis and symphysis
These points indicate where the Rectus abdominis starts.
Where does the Rectus abdominis muscle insert?
Cartilage of ribs 5 – 7, xiphoid process
These are the insertion points for the Rectus abdominis muscle.
What is the action of the External oblique muscle?
Rotation of trunk
External oblique aids in trunk rotation.
What is the origin of the External oblique muscle?
Outer borders of lower 8 ribs and costal cartilage
These structures serve as the origin for the External oblique.
Where does the External oblique muscle insert?
Iliac crest, linea alba, pubic symphysis, inguinal ligament
These are the various insertion points for the External oblique.
What is the action of the Transverse abdominis muscle?
Stabilisation of lumbar spine and pelvis
Transverse abdominis plays a key role in core stability.
What is the origin of the Transverse abdominis muscle?
Lateral third of inguinal ligament, thoracolumbar fascia, anterior two-thirds of inner Iliac crest
These points indicate where the Transverse abdominis starts.
Where does the Transverse abdominis muscle insert?
Inner surface of lower 6 ribs
This is the insertion point for the Transverse abdominis muscle.
True or False: The abdominal muscles stabilize the lumbar spine.
True
Abdominal muscles play an important role in stabilizing the lumbar region.
Fill in the blank: The abdominal muscles allow movement of the trunk, including __________ and rotation.
flexion
Flexion is a primary movement facilitated by the abdominal muscles.
